際際滷

際際滷Share a Scribd company logo

Well Log Interpretation and Petrophysical Analisis in [Autosaved]

Download as PPTX, PDF
R
Ridho Nanda Pratama

PT. Halliburton Logging Service is a branch of Halliburton that provides completion and production services, drilling, and reservoir evaluation to oil companies in Sumatra, Indonesia. Dery Marsan and Ridho Nanda Pratama completed an on-job training program at Halliburton from August to September 2015. Their project involved well log analysis to determine water saturation and the most suitable water resistivity parameters in two formations, with the objectives of identifying water zones, evaluating challenges around determining petrophysical parameters, and analyzing well data. Their analysis identified both water-bearing and possible oil-bearing zones through evaluation of gamma ray, resistivity, neutron-density crossplots, and other well logs.

1 of 56
Downloaded 682 times
Dery Marsan and Ridho Nanda Pratama Geophysical Engineering Institut Teknologi Bandung On Job Training Program PT.HALLIBURTON LOGGING SERVICE 2015
PT. Halliburton Logging Service is branch of American multinational corporation and one of largest oil field service companies. Located in Duri, Riau, Indonesia and assist Oil Company in Sumatran Region to perform Completion and Production service, Drilling and Reservoir evaluation. On Job Training Timeline : August 10th September 10th 2015
Background Objective Basic Theory Well Data Analysis Conclusion
Demand and supply of energy for human daily needs Well optimization for stable production Requires formation evaluation and petrophysical analysis to interpret well condition and also reservoir beneath the surface Challenge for determining petrophysical parameters
Determining water zone There are 2 formations will be evaluated Determining the most suitable Rw and Sw parameters of interest zone from each formation Analyzing data log by correlating each response curve Determine Rw and Sw Value in each Interest Zone OBJECTIVES CHALLENGES
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Environmental Correction for OH data Determine Volume of Shale from GR Determine Total Porosity Determine Effective Porosity Determine a (turtuosity factor), m (cementation factor), and n (saturation exponent) for Archies Formula Determine Rw Determine Sw
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Archie equation developed an experiment based on clean sand model non-shale content Only formation water is the only conductive material inside. Most of the clastic reservoir rocks have shale content. Shale has clay bound water, Archie equation doesnt differentiate any kind of water, it treats all water as the same. Shale contribute formation conductivity Archie equation was proposed for clean sandstone reservoir and need modified equation to calculate water saturation for shaly sand formation.
Shaly Sand Reservoir is a siliciclastic reservoir in which shale affects reservoir evaluation and/or reservoir behavior which consist of mixture of both sand and shale. E.C Thomas and Sneider Classification
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Caliper log Spontaneous potential log Radioactive log gamma ray log density log neutron log Resistivity Log induction log dual laterolog microresistivity log Acoustic log (Sonic log)
Caliper log measures variations in borehole diameter with depth, inches as it units. Work by recording electrical signal that moved by arm movements (spring) inside this tools Application : used for formation evaluations to know the permeability indicator by comparing to bit sizes data (ex: porous and permeable sandstone, washout indicator (most in shales) ) quantify the irregularities for correction calculate BHV (Borehole volume)
measuring the difference between voltage in surface and in downhole with extremely small amount of voltage (mV). The concept comes from the difference of concentration ion in openhole between drilling mud and formation water. Application by using this method we can retrieve information about: identify bed boundaries permeability indicator shale / non-shale zone (lithology indicator) volume of shale indicator depth correlation Rw calculation
Source of SP signal : Electrochemical (produce >95% signal). Consist of liquid junction potential and membrane potential Electrokinetic (rare signal) The magnitude of deflection will depends on contrast of the salinity of two liquids Total deflection measured from shale base line
Record natural radioactivity in formations, when the value will increase if concentration of radioactive material is high where the common particle is Thorium, Kalium and Uranium that the presence is high in shale and low in sandstone) Application by using this method we can retrieve information about: Correlation of depth Bed boundaries Determining volume of shale Indicator of lithology Depth control
The concept is bombard the rocks with radiation and record the amount of radiation that is not absorbed by rock,the unit is p.u (porosity unit) Neutron will be slow if collision with the particle that have same mass (example : Hydrogen and Chlorine). By retrieving information from hydrogen ions, we can estimate porosity in formation (direct measurement).The more particle collision with matter, the response will become more low.
Density log is tool that record of formations bulk density by radiating gamma ray into formation. The unit is g/cc. The function of this log is to calculate the porosity, and determining formation density. Application : lithology indicators identify certain minerals identify overpressure, fracture porosity, and evaporates minerals. detect gas-bearing zone.
Concept: AC current pass through transmitter coil and create AC magnetic field and give rise induced eddy voltage loops in formation. And then AC current flow the induced formations and voltage in receiver coils. Problem : requires non-conductive fluid in borehole, but work in air hole and muds Application : Determine Rt and Sw Invasion profiling (diameters, permeability indications) Hydrocarbon bearing zone Environment : Fresh water based mud as long as Rmf/Rw > 2.5 Oil based mud Air drilled boreholes In salt water-based mud & low contrast Rmf/Rw
Application : Determining true formation resistivity (Rt) for calculating uninvaded zone saturation (Sw) Identification thin beds Determining flused zone resistivity (Rxo) for calculating flushed zone saturation ( Sxo) Indicate moveable hydrocarbon (in combo)* Estimate diameter invasion (in combo)* Correct deeper reading of resisvity because effect of invasion
detect resistivity of a formation in uninvaded zone. LLS : (high current frequency) 1050 Hz Depth of Investigation : 2-3 feet Vertical Resolution : 2 feet
detect resistivity of a formation in uninvaded zone. Frequency : low current frequency 131.25 Hz Depth of Investigation : 5-7 feet Vertical Resolution : 2 feet
detect resistivity of a formation which is closer to borehole. Application : to estimate the depth of fluid invasion determine value for flushed zone resistivity (Rxo) to calculating flushed zone water saturation (Sxo)
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Effective porosity equation :
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Ratio Method SP Method
Archie Equation Simandoux Equation Indonesia Equation (Sasha Reference Manual, 2013)
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
RMF 0.07 Ohm m RMF @ Temp 80.5 F Total Depth 1539 feet Bottom Hole Temp 150 F Surface Temp 82.5 F Processing Interval 4 Feet
Environmental Correction Quick Look Interpretation Determine Vsh Determine Effective porosity Calculating Rw Sw Calculation
Based on: GR Log, interval consist of shale zone and non shale zone SP log, at non shale zone for all formation has negative deflection, Rw>Rmf, fresh water in formation Caliper log, at non shale part it shows mudcake (less than 8.5) that means permeable zone and shale part shows washout (more than 8.5 ) Separation between MSFL and DLL log almost apear at all interval which means good permeability. Pe, range between 2-4, some part contain shale zone and sandstone zone and shaly sandstone as well Density-Neutron, separation between both log at shale zone, almost stack in sand interval which means waterzone, and probably HC. Separation that show butterfly effect highly identified as gas bearing zone.
Analysis Depth 556 feet Interval Analysis 4 feet Formation A 900-1166 (266 Ft) Formation B 1166 - 1456 (290 Ft) Formation A : shale dominated, shaly sand reservoir Formation B: clearly to determine reservoir zone and shale zone
WATER BEARING ZONE Formation Ratio Method Inverse Archie Method SP Method A 0.289860964 1.575997521 0.039062 Water Bearing Zone (1086-1091 ft) Lower GR Permeable zone (separation, SP, mudcake) Deflection response in Resistivity Pe value is close to 2.1 (sandstone with shale effect) Neutron-Density almost stack each other Rw Archie Equation Simandoux Equation Indonesia Equation Inverse 1 0.940377 0.679455 SP 0.157434 0.164983 0.154414 RATIO 0.428862 0.433977 0.368047
Formation Ratio Method Inverse Archie Method SP Method B 0.588504195 2.283667181 0.042503 Water Bearing Zone (1189-1195 ft) Lower GR Permeable zone (separation, SP, mudcake) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other Rw Archie Equation Simandoux Equation Indonesia Equation Inverse 1 1.043928 0.516518 SP 0.136425 0.170943 0.146134 Ratio 0.507643 0.587798 0.372039
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
WATER BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1086-1091 0.24242424 0.372 0.307212 0.228615 RW Water Saturation Archie Simandoux Indonesia Archie 1.020766 0.742287662 0.580337134 SP 0.160703 0.199420508 0.17964779 Ratio 0.437767 0.431702805 0.364171124 Water Bearing Zone (1186-1091 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
OIL BEARING ZONE WATER BEARING ZONE Oil Bearing Zone (1166-1189 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other Water Bearing Zone (1189-1217 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
OIL BEARING ZONE WATER BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1166-1189 0.32323232 0.365 0.344116 0.272849 1189-1217 0.33333333 0.3705 0.351917 0.263166 RW Water Saturation Archie Simandoux Indonesia Archie 1.478501 0.755435071 0.650912958 SP 0.232766 0.440332997 0.372657851 Ratio 0.634072 0.640019975 0.540872593 RW Water Saturation Archie Simandoux Indonesia Archie 0.888042 0.90969247 0.464719272 SP 0.12115 0.150415762 0.129376124 Ratio 0.450808 0.514985349 0.33234166
OIL BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1250-1265 0.24418605 0.284090909 0.341 0.31267 RW Water Saturation Archie Simandoux Indonesia Archie 0.841112 0.753672841 0.411575334 SP 0.114748 0.171353274 0.13220247 Ratio 0.426985 0.485346662 0.300712135 Oil Bearing Zone (1250-1265 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
GAS BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1310-1334 0.35858586 0.175 0.287403 0.2412 RW Water Saturation Archie Simandoux Indonesia Archie 0.410042 0.297849671 0.198358619 SP 0.05594 0.068036849 0.058469459 Ratio 0.208155 0.197823305 0.142845177 Gas Bearing Zone (1310-1334 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density stack each other, and show butterfly effect area
GAS BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1385-1424 0.34435262 0.203 0.28602 2 0.23434 RW Water Saturation Archie Simandoux Indonesia Archie 0.479837 0.367534936 0.231584102 SP 0.065461 0.084017427 0.070268843 Ratio 0.243586 0.242422956 0.167927319 Gas Bearing Zone (1385-1424 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density stack each other and show butterfly effect
Inverse Archie method is more suitable to determine Rw value for both of this formation Sw method that compatible for this well is Archie Equation and Indonesia Equation (for A formation).For B formation, the suitable ones is Simandoux and Archie Equation There are identified potential HC zone which contain gas or oil: Oil : 1166-1189 ft, 1250-1265 ft Gas : 1310-1334 ft, 1385-1424ft Another data and method improvement is needed for crosscheck data and get better result
Well Log Interpretation and Petrophysical Analisis in [Autosaved]
API No. N/A OtherServices: GR/SFTT Location N :X GR/SWC E:Y LAT:A LOT:B PermanentDatum G.L. Elev. 106.6 ft Elev.: K.B. 127.1 ft Logmeasured from O.R.T. 19.5ftabove perm. Datum D.F. 126.1 ft Drillingmeasured from O.R.T. G.L. 106.6 ft 9.625 in @ 983.0 ft 12.250 IN 983.00 ft 0.197 ohmm 75.30 degF 0.13 ohmm 75.80 degF 0.216 ohmm 78.80 degF 0.07 ohmm 223.0 degF 8-Aug-13 10:04 223 degF @ 5638.0 ft H A LLIB U R T O N COMPANY WELL ALFA CENTAURY Saturnus #123 TRIPLE COMBO 1:200(MD) PT.CHEVRONPACIFIC INDONESIA PT.CHEVRON PACIFIC INDONESIA Saturnus #123 ALFA CENTAURY RIAU COUNTRY INDONESIA Source of Sample WELL FIELD PROVINCE FIELD PROVINCE COUNTRY COMPANY Date Run No. Saturnus#123 ALFACENTAURY RIAU INDONESIA BitSize Type Fluid in Hole Depth - Driller Depth - Logger Casing- Driller Witnessed by 8-Aug-13 ONE 5678.00 ft 5638.0 ft 5632.0 ft 983.0 ft 983.0 ft 8.500 in Bottom- Logged Interval Top - Logged Interval Casing- Logger DIONYSIUS ANGGA @ Density PH Viscosity KCL- POLYMER FLOWLINE Time Since Circulation Time on Botom Max. Rec. Temperature Recorded by Equipment Location Rm@Meas. Temperature Rmf @Meas. Temperature MR. CHANDRA WINATA T-1475 CAS 16.1 hr MEASURED MEASURED @ Rmc@Meas. Temperature Rm@BHT Source Rmf Rmc Fluid Loss 9.4 ppg 9.00pH 59.00 s/qt 4.9 cptm @ @ @ @ @ @ @ @ @ @@ @ @ @ @ @ 0.197 ohmm 75.30 degF 0.13 ohmm 75.80 degF 0.216 ohmm 78.80 degF 0.07 ohmm 223.0 degF 8-Aug-13 10:04 223 degF @ 5638.0 ft Source of Sample Bit Size Type Fluid in Hole 8.500 in @ Density PH Viscosity KCL - POLYMER FLOWLINE Time Since Circulation Time on Botom Max. Rec. Temperature Rm @ Meas. Temperature Rmf @ Meas. Temperature 16.1 hr MEASURED MEASURED @ Rmc @ Meas. Temperature Rm @ BHT Source Rmf Rmc Fluid Loss 9.4 ppg 9.00 pH 59.00 s/qt 4.9 cptm @ @
GR was corrected to borehole diameter, mud density & tool position. Resistivity was corrected to borehole temperature, borehole diameter and bed thickness Micro Resistivity was corrected to mudcake resistivity at formation temperature and mudcake thickness Neutron Porosity was corrected to mudcake thickness, borehole salinity, natural or barite mud density, formation temperature and pressure Density was corrected real time during logging
Based on: GR Log, interval consist of shale zone and non shale zone SP log, at non shale zone for all formation has negative deflection, Rw>Rmf, fresh water in formation Caliper log, at non shale part it shows mudcake (less than 8.5) that means permeable zone and shale part shows washout (more than 8.5 ) Separation between MSFL and DLL log almost apear at all interval which means good permeability. Pe, range between 2-4, some part contain shale zone and sandstone zone with probably contain shale and calcareous. Density-Neutron, separation between both log at shale zone, almost stack in sand interval which means waterzone, and probably HC
Water Bearing Zone (5480 5516 ft and 5544 5560 ft) Lower GR Resistivity slighlty lower than other sand body Pe value is close to 1.8 (sandstone) Neutron-Density almost stack each other (Neutron slightly to right of density) Shale Zone (4900 5450 ft) Higher GR Resistivity and MSFL curve quite stack Lower Resistivity Pe value between 2.5-4 Oil Bearing Zone (5456 - 5480 ft) Lower GR Higher Rsesistivity Pe value is close to 2 (sandstone) Neutron-Density almost stack each other (Neutron slightly to right of density) Water Bearing Zone Shale Zone Oil Bearing Zone Water Bearing Zone
Depth Density porosity Neutron Porosity Total Porosit y Effectiv e Porosit y 5456 5480 0.245 0.258 0.252 0.205 Oil Bearing Zone Rw calculation method Sw Archie Sw Simandoux Sw Indonesia Rwa (=2.299) 0.4248 0.09559 0.1942 Rw SP (=0.152) 0.4248 0.0714 0.0584 Rw Ratio (=0.765) 0.4248 0.0921 0.1396
Water Bearing Zone Water Bearing Zone Depth Density porosity Neutron Porosity Total Porosi ty Effective Porosity 5480 5516 0.247 0.254 0.251 0.206 5544 5560 0.226 0.262 0.244 0.214 Rw calculation method Sw Archie Sw Simandoux Sw Indonesia Rwa (=2.299) 1.0105 0.330024 0.41753 Rw SP (=0.152) 1.0987 0.2706 0.1504 Rw Ratio (=0.765) 1.0987 0.4887 0.3611
Conclusion 1. Sw method that compatible for this well is Archie Equation (clean sand part) and Simandoux Equation (for shale part) 2. In A Formation there are: Oil bearing zone at 5456 5480 ft Water bearing zone at 5480 5516 ft and 5544 5560 ft Suggestion 1. Shaly sand analysis study would be better if compared to core data and thin section to know clay distribution that more reliable

More Related Content

Well Log Interpretation and Petrophysical Analisis in [Autosaved]

  • 1. Dery Marsan and Ridho Nanda Pratama Geophysical Engineering Institut Teknologi Bandung On Job Training Program PT.HALLIBURTON LOGGING SERVICE 2015
  • 2. PT. Halliburton Logging Service is branch of American multinational corporation and one of largest oil field service companies. Located in Duri, Riau, Indonesia and assist Oil Company in Sumatran Region to perform Completion and Production service, Drilling and Reservoir evaluation. On Job Training Timeline : August 10th September 10th 2015
  • 3. Background Objective Basic Theory Well Data Analysis Conclusion
  • 4. Demand and supply of energy for human daily needs Well optimization for stable production Requires formation evaluation and petrophysical analysis to interpret well condition and also reservoir beneath the surface Challenge for determining petrophysical parameters
  • 5. Determining water zone There are 2 formations will be evaluated Determining the most suitable Rw and Sw parameters of interest zone from each formation Analyzing data log by correlating each response curve Determine Rw and Sw Value in each Interest Zone OBJECTIVES CHALLENGES
  • 7. Environmental Correction for OH data Determine Volume of Shale from GR Determine Total Porosity Determine Effective Porosity Determine a (turtuosity factor), m (cementation factor), and n (saturation exponent) for Archies Formula Determine Rw Determine Sw
  • 9. Archie equation developed an experiment based on clean sand model non-shale content Only formation water is the only conductive material inside. Most of the clastic reservoir rocks have shale content. Shale has clay bound water, Archie equation doesnt differentiate any kind of water, it treats all water as the same. Shale contribute formation conductivity Archie equation was proposed for clean sandstone reservoir and need modified equation to calculate water saturation for shaly sand formation.
  • 10. Shaly Sand Reservoir is a siliciclastic reservoir in which shale affects reservoir evaluation and/or reservoir behavior which consist of mixture of both sand and shale. E.C Thomas and Sneider Classification
  • 13. Caliper log Spontaneous potential log Radioactive log gamma ray log density log neutron log Resistivity Log induction log dual laterolog microresistivity log Acoustic log (Sonic log)
  • 14. Caliper log measures variations in borehole diameter with depth, inches as it units. Work by recording electrical signal that moved by arm movements (spring) inside this tools Application : used for formation evaluations to know the permeability indicator by comparing to bit sizes data (ex: porous and permeable sandstone, washout indicator (most in shales) ) quantify the irregularities for correction calculate BHV (Borehole volume)
  • 15. measuring the difference between voltage in surface and in downhole with extremely small amount of voltage (mV). The concept comes from the difference of concentration ion in openhole between drilling mud and formation water. Application by using this method we can retrieve information about: identify bed boundaries permeability indicator shale / non-shale zone (lithology indicator) volume of shale indicator depth correlation Rw calculation
  • 16. Source of SP signal : Electrochemical (produce >95% signal). Consist of liquid junction potential and membrane potential Electrokinetic (rare signal) The magnitude of deflection will depends on contrast of the salinity of two liquids Total deflection measured from shale base line
  • 17. Record natural radioactivity in formations, when the value will increase if concentration of radioactive material is high where the common particle is Thorium, Kalium and Uranium that the presence is high in shale and low in sandstone) Application by using this method we can retrieve information about: Correlation of depth Bed boundaries Determining volume of shale Indicator of lithology Depth control
  • 18. The concept is bombard the rocks with radiation and record the amount of radiation that is not absorbed by rock,the unit is p.u (porosity unit) Neutron will be slow if collision with the particle that have same mass (example : Hydrogen and Chlorine). By retrieving information from hydrogen ions, we can estimate porosity in formation (direct measurement).The more particle collision with matter, the response will become more low.
  • 19. Density log is tool that record of formations bulk density by radiating gamma ray into formation. The unit is g/cc. The function of this log is to calculate the porosity, and determining formation density. Application : lithology indicators identify certain minerals identify overpressure, fracture porosity, and evaporates minerals. detect gas-bearing zone.
  • 20. Concept: AC current pass through transmitter coil and create AC magnetic field and give rise induced eddy voltage loops in formation. And then AC current flow the induced formations and voltage in receiver coils. Problem : requires non-conductive fluid in borehole, but work in air hole and muds Application : Determine Rt and Sw Invasion profiling (diameters, permeability indications) Hydrocarbon bearing zone Environment : Fresh water based mud as long as Rmf/Rw > 2.5 Oil based mud Air drilled boreholes In salt water-based mud & low contrast Rmf/Rw
  • 21. Application : Determining true formation resistivity (Rt) for calculating uninvaded zone saturation (Sw) Identification thin beds Determining flused zone resistivity (Rxo) for calculating flushed zone saturation ( Sxo) Indicate moveable hydrocarbon (in combo)* Estimate diameter invasion (in combo)* Correct deeper reading of resisvity because effect of invasion
  • 22. detect resistivity of a formation in uninvaded zone. LLS : (high current frequency) 1050 Hz Depth of Investigation : 2-3 feet Vertical Resolution : 2 feet
  • 23. detect resistivity of a formation in uninvaded zone. Frequency : low current frequency 131.25 Hz Depth of Investigation : 5-7 feet Vertical Resolution : 2 feet
  • 24. detect resistivity of a formation which is closer to borehole. Application : to estimate the depth of fluid invasion determine value for flushed zone resistivity (Rxo) to calculating flushed zone water saturation (Sxo)
  • 31. Archie Equation Simandoux Equation Indonesia Equation (Sasha Reference Manual, 2013)
  • 34. RMF 0.07 Ohm m RMF @ Temp 80.5 F Total Depth 1539 feet Bottom Hole Temp 150 F Surface Temp 82.5 F Processing Interval 4 Feet
  • 35. Environmental Correction Quick Look Interpretation Determine Vsh Determine Effective porosity Calculating Rw Sw Calculation
  • 36. Based on: GR Log, interval consist of shale zone and non shale zone SP log, at non shale zone for all formation has negative deflection, Rw>Rmf, fresh water in formation Caliper log, at non shale part it shows mudcake (less than 8.5) that means permeable zone and shale part shows washout (more than 8.5 ) Separation between MSFL and DLL log almost apear at all interval which means good permeability. Pe, range between 2-4, some part contain shale zone and sandstone zone and shaly sandstone as well Density-Neutron, separation between both log at shale zone, almost stack in sand interval which means waterzone, and probably HC. Separation that show butterfly effect highly identified as gas bearing zone.
  • 37. Analysis Depth 556 feet Interval Analysis 4 feet Formation A 900-1166 (266 Ft) Formation B 1166 - 1456 (290 Ft) Formation A : shale dominated, shaly sand reservoir Formation B: clearly to determine reservoir zone and shale zone
  • 38. WATER BEARING ZONE Formation Ratio Method Inverse Archie Method SP Method A 0.289860964 1.575997521 0.039062 Water Bearing Zone (1086-1091 ft) Lower GR Permeable zone (separation, SP, mudcake) Deflection response in Resistivity Pe value is close to 2.1 (sandstone with shale effect) Neutron-Density almost stack each other Rw Archie Equation Simandoux Equation Indonesia Equation Inverse 1 0.940377 0.679455 SP 0.157434 0.164983 0.154414 RATIO 0.428862 0.433977 0.368047
  • 39. Formation Ratio Method Inverse Archie Method SP Method B 0.588504195 2.283667181 0.042503 Water Bearing Zone (1189-1195 ft) Lower GR Permeable zone (separation, SP, mudcake) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other Rw Archie Equation Simandoux Equation Indonesia Equation Inverse 1 1.043928 0.516518 SP 0.136425 0.170943 0.146134 Ratio 0.507643 0.587798 0.372039
  • 41. WATER BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1086-1091 0.24242424 0.372 0.307212 0.228615 RW Water Saturation Archie Simandoux Indonesia Archie 1.020766 0.742287662 0.580337134 SP 0.160703 0.199420508 0.17964779 Ratio 0.437767 0.431702805 0.364171124 Water Bearing Zone (1186-1091 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
  • 43. OIL BEARING ZONE WATER BEARING ZONE Oil Bearing Zone (1166-1189 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other Water Bearing Zone (1189-1217 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) Low curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
  • 44. OIL BEARING ZONE WATER BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1166-1189 0.32323232 0.365 0.344116 0.272849 1189-1217 0.33333333 0.3705 0.351917 0.263166 RW Water Saturation Archie Simandoux Indonesia Archie 1.478501 0.755435071 0.650912958 SP 0.232766 0.440332997 0.372657851 Ratio 0.634072 0.640019975 0.540872593 RW Water Saturation Archie Simandoux Indonesia Archie 0.888042 0.90969247 0.464719272 SP 0.12115 0.150415762 0.129376124 Ratio 0.450808 0.514985349 0.33234166
  • 45. OIL BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1250-1265 0.24418605 0.284090909 0.341 0.31267 RW Water Saturation Archie Simandoux Indonesia Archie 0.841112 0.753672841 0.411575334 SP 0.114748 0.171353274 0.13220247 Ratio 0.426985 0.485346662 0.300712135 Oil Bearing Zone (1250-1265 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density almost stack each other
  • 46. GAS BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1310-1334 0.35858586 0.175 0.287403 0.2412 RW Water Saturation Archie Simandoux Indonesia Archie 0.410042 0.297849671 0.198358619 SP 0.05594 0.068036849 0.058469459 Ratio 0.208155 0.197823305 0.142845177 Gas Bearing Zone (1310-1334 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density stack each other, and show butterfly effect area
  • 47. GAS BEARING ZONE Depth Density porosity Neutron Porosity Total Porosity Effective Porosity 1385-1424 0.34435262 0.203 0.28602 2 0.23434 RW Water Saturation Archie Simandoux Indonesia Archie 0.479837 0.367534936 0.231584102 SP 0.065461 0.084017427 0.070268843 Ratio 0.243586 0.242422956 0.167927319 Gas Bearing Zone (1385-1424 ft) Lower GR Permeable zone (separation, deflection in SP, has mudcake on caliper log) High curve response in Resistivity Pe value is close to 2.0 (clean sandstone) Neutron-Density stack each other and show butterfly effect
  • 48. Inverse Archie method is more suitable to determine Rw value for both of this formation Sw method that compatible for this well is Archie Equation and Indonesia Equation (for A formation).For B formation, the suitable ones is Simandoux and Archie Equation There are identified potential HC zone which contain gas or oil: Oil : 1166-1189 ft, 1250-1265 ft Gas : 1310-1334 ft, 1385-1424ft Another data and method improvement is needed for crosscheck data and get better result
  • 50. API No. N/A OtherServices: GR/SFTT Location N :X GR/SWC E:Y LAT:A LOT:B PermanentDatum G.L. Elev. 106.6 ft Elev.: K.B. 127.1 ft Logmeasured from O.R.T. 19.5ftabove perm. Datum D.F. 126.1 ft Drillingmeasured from O.R.T. G.L. 106.6 ft 9.625 in @ 983.0 ft 12.250 IN 983.00 ft 0.197 ohmm 75.30 degF 0.13 ohmm 75.80 degF 0.216 ohmm 78.80 degF 0.07 ohmm 223.0 degF 8-Aug-13 10:04 223 degF @ 5638.0 ft H A LLIB U R T O N COMPANY WELL ALFA CENTAURY Saturnus #123 TRIPLE COMBO 1:200(MD) PT.CHEVRONPACIFIC INDONESIA PT.CHEVRON PACIFIC INDONESIA Saturnus #123 ALFA CENTAURY RIAU COUNTRY INDONESIA Source of Sample WELL FIELD PROVINCE FIELD PROVINCE COUNTRY COMPANY Date Run No. Saturnus#123 ALFACENTAURY RIAU INDONESIA BitSize Type Fluid in Hole Depth - Driller Depth - Logger Casing- Driller Witnessed by 8-Aug-13 ONE 5678.00 ft 5638.0 ft 5632.0 ft 983.0 ft 983.0 ft 8.500 in Bottom- Logged Interval Top - Logged Interval Casing- Logger DIONYSIUS ANGGA @ Density PH Viscosity KCL- POLYMER FLOWLINE Time Since Circulation Time on Botom Max. Rec. Temperature Recorded by Equipment Location Rm@Meas. Temperature Rmf @Meas. Temperature MR. CHANDRA WINATA T-1475 CAS 16.1 hr MEASURED MEASURED @ Rmc@Meas. Temperature Rm@BHT Source Rmf Rmc Fluid Loss 9.4 ppg 9.00pH 59.00 s/qt 4.9 cptm @ @ @ @ @ @ @ @ @ @@ @ @ @ @ @ 0.197 ohmm 75.30 degF 0.13 ohmm 75.80 degF 0.216 ohmm 78.80 degF 0.07 ohmm 223.0 degF 8-Aug-13 10:04 223 degF @ 5638.0 ft Source of Sample Bit Size Type Fluid in Hole 8.500 in @ Density PH Viscosity KCL - POLYMER FLOWLINE Time Since Circulation Time on Botom Max. Rec. Temperature Rm @ Meas. Temperature Rmf @ Meas. Temperature 16.1 hr MEASURED MEASURED @ Rmc @ Meas. Temperature Rm @ BHT Source Rmf Rmc Fluid Loss 9.4 ppg 9.00 pH 59.00 s/qt 4.9 cptm @ @
  • 51. GR was corrected to borehole diameter, mud density & tool position. Resistivity was corrected to borehole temperature, borehole diameter and bed thickness Micro Resistivity was corrected to mudcake resistivity at formation temperature and mudcake thickness Neutron Porosity was corrected to mudcake thickness, borehole salinity, natural or barite mud density, formation temperature and pressure Density was corrected real time during logging
  • 52. Based on: GR Log, interval consist of shale zone and non shale zone SP log, at non shale zone for all formation has negative deflection, Rw>Rmf, fresh water in formation Caliper log, at non shale part it shows mudcake (less than 8.5) that means permeable zone and shale part shows washout (more than 8.5 ) Separation between MSFL and DLL log almost apear at all interval which means good permeability. Pe, range between 2-4, some part contain shale zone and sandstone zone with probably contain shale and calcareous. Density-Neutron, separation between both log at shale zone, almost stack in sand interval which means waterzone, and probably HC
  • 53. Water Bearing Zone (5480 5516 ft and 5544 5560 ft) Lower GR Resistivity slighlty lower than other sand body Pe value is close to 1.8 (sandstone) Neutron-Density almost stack each other (Neutron slightly to right of density) Shale Zone (4900 5450 ft) Higher GR Resistivity and MSFL curve quite stack Lower Resistivity Pe value between 2.5-4 Oil Bearing Zone (5456 - 5480 ft) Lower GR Higher Rsesistivity Pe value is close to 2 (sandstone) Neutron-Density almost stack each other (Neutron slightly to right of density) Water Bearing Zone Shale Zone Oil Bearing Zone Water Bearing Zone
  • 54. Depth Density porosity Neutron Porosity Total Porosit y Effectiv e Porosit y 5456 5480 0.245 0.258 0.252 0.205 Oil Bearing Zone Rw calculation method Sw Archie Sw Simandoux Sw Indonesia Rwa (=2.299) 0.4248 0.09559 0.1942 Rw SP (=0.152) 0.4248 0.0714 0.0584 Rw Ratio (=0.765) 0.4248 0.0921 0.1396
  • 55. Water Bearing Zone Water Bearing Zone Depth Density porosity Neutron Porosity Total Porosi ty Effective Porosity 5480 5516 0.247 0.254 0.251 0.206 5544 5560 0.226 0.262 0.244 0.214 Rw calculation method Sw Archie Sw Simandoux Sw Indonesia Rwa (=2.299) 1.0105 0.330024 0.41753 Rw SP (=0.152) 1.0987 0.2706 0.1504 Rw Ratio (=0.765) 1.0987 0.4887 0.3611
  • 56. Conclusion 1. Sw method that compatible for this well is Archie Equation (clean sand part) and Simandoux Equation (for shale part) 2. In A Formation there are: Oil bearing zone at 5456 5480 ft Water bearing zone at 5480 5516 ft and 5544 5560 ft Suggestion 1. Shaly sand analysis study would be better if compared to core data and thin section to know clay distribution that more reliable