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Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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0 GR API 150 5000 5010 5020 5030 5040 5050 5060 5070 5080 5090 0.2 0.2 0.2 ILD ohm-m ILM ohm-m LL8 ohm-m 2000 2000 2000 BBB00 5100 3. The resistivity logs above are for the same interval as the logs for questions 1 & 2. Answer the following questions related to these logs with the following additional information: For Archie's Equations, a=0.81, m=n=2. Also, Rw=0.05 ohm-m. a. Estimate the water saturation for each sandstone zone. b. Which sandstone is a better prospect for producing oil and/or gas? Explain, giving at least two reasons to support your choice. 4. The density/neutron porosity readings are nearly the same in both sandstones, so that suggests liquid hydrocarbon (oil). HOWEVER, in order to get some practice, I want you to evaluate the upper sandstone as a gas reservoir. Estimate the OGIP assuming a drainage area of 250 acres, a geothermal gradient of 1.2°F/100 ft, and a pore pressure gradient of 0.65 psi/ft.
Transcribed Image Text:0 GR API 150 5000 5010 5020 5030 5040 5050 5060 5070 5080 5090 0.2 0.2 0.2 ILD ohm-m ILM ohm-m LL8 ohm-m 2000 2000 2000 BBB00 5100 3. The resistivity logs above are for the same interval as the logs for questions 1 & 2. Answer the following questions related to these logs with the following additional information: For Archie's Equations, a=0.81, m=n=2. Also, Rw=0.05 ohm-m. a. Estimate the water saturation for each sandstone zone. b. Which sandstone is a better prospect for producing oil and/or gas? Explain, giving at least two reasons to support your choice. 4. The density/neutron porosity readings are nearly the same in both sandstones, so that suggests liquid hydrocarbon (oil). HOWEVER, in order to get some practice, I want you to evaluate the upper sandstone as a gas reservoir. Estimate the OGIP assuming a drainage area of 250 acres, a geothermal gradient of 1.2°F/100 ft, and a pore pressure gradient of 0.65 psi/ft.
GR API CALI inches BitSize inches PNL MY 150 16 16 GR 5000 5010 5020 5030 5040 5050 5060 5070 5080 5090 5100 0.45 0.45 DPHI v/v decimal NPHI v/v decimal N 1. Looking at the gamma ray and caliper logs above, answer the following questions. a. Indicate the depth range and thickness for each identifiable sandstone b. Describe two types of responses from these logs that indicate shale? -0.15 -0.15 2. Using the density and neutron logs from the same figure above, answer the following questions. a. What is your estimate of porosity for each of the zones you identified as sandstone? b. Is there any indication of gas for these sandstones? Explain.
Transcribed Image Text:GR API CALI inches BitSize inches PNL MY 150 16 16 GR 5000 5010 5020 5030 5040 5050 5060 5070 5080 5090 5100 0.45 0.45 DPHI v/v decimal NPHI v/v decimal N 1. Looking at the gamma ray and caliper logs above, answer the following questions. a. Indicate the depth range and thickness for each identifiable sandstone b. Describe two types of responses from these logs that indicate shale? -0.15 -0.15 2. Using the density and neutron logs from the same figure above, answer the following questions. a. What is your estimate of porosity for each of the zones you identified as sandstone? b. Is there any indication of gas for these sandstones? Explain.
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