A newly developed cased hole analysis technique provides detailed information on (1) reservoir rock properties, such as porosity, shaliness, and formation permeability, (2) reservoir fluid saturation, (3) distinction of oil and gas pays, (4) state of reservoir depletion, such as cumulative hydrocarbon-feet at present time and cumulative hydrocarbon-feet already depleted (e.g., the sum of both values then giving the cumulative hydrocarbon-feet originally present), and (5) monitoring of hydrocarbon/water and gas/oil contacts behind pipe. The basic well log data required for this type of analysis include the Dual-Detector Neutron Lifetime Log, run in casing at any particular time in the life of a reservoir, and the initial open-hole resistivity log. In addition, porosity information from open-hole porosity log(s) or core data is necessary. Field examples from several areas are presented and discussed in the light of formation reservoir and hydrocarbon production characteristics.
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Time-Lapse Cased Hole Reservoir Evaluation Based On The Dual-Detector Neutron Lifetime Log---The CHES II Approach
M.R. DeVries;
M.R. DeVries
Dresser Atlas, Dresser Industries, Inc.
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Walter H. Fertl
Walter H. Fertl
Dresser Atlas, Dresser Industries, Inc.
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Paper presented at the SPWLA 18th Annual Logging Symposium, Houston, Texas, June 1977.
Paper Number:
SPWLA-1977-V
Published:
June 05 1977
Citation
DeVries, M.R., and Walter H. Fertl. "Time-Lapse Cased Hole Reservoir Evaluation Based On The Dual-Detector Neutron Lifetime Log---The CHES II Approach." Paper presented at the SPWLA 18th Annual Logging Symposium, Houston, Texas, June 1977.
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