Abstract
Unconventional oil and gas resources, especially shale gas resources have great potential for exploration and development in China. In Shale gas exploration and development process, reservoir pore pressure is a very important parameter, and the pore pressure prediction can improve the appraisal accuracy of project dessert. This paper analyzes several formation pore pressure calculation methods based on logging data, and optimized the “Equivalent depth method”. The preliminary results show that this method can carry out the accurate evaluation on the abnormal high pressure of the shale gas reservoirs of Fuling area with high calculation precision and application potential.
Highlights
INTRODUCTIONEvaluation of formation pore pressure by using welllogging data has the characteristics of continuous analysis data, low cost, and reliable precision [1,2,3,4]
In the buried environment of reservoirs, we believe that the overburden pressure at a certain depth point should be borne together by the reservoir pore pressure and the framework supporting stress
Logging Evaluation Method for Pore Pressure ods of vertical effective stress are all backward-reasoned from the acoustic velocity model of experience that was proposed by Eberhart Phillips when he was studying the acoustic velocity model
Summary
Evaluation of formation pore pressure by using welllogging data has the characteristics of continuous analysis data, low cost, and reliable precision [1,2,3,4]. To see examples of using these methods for the shale gas reservoirs that have the characteristics of generating itself, storaging itself and enveloping itself. The study area of this paper lies in the Fuling area of Sichuan basin, and its good potential of organic rich shale mainly developed in the Longmaxi formation of Silurian to the Wufeng formation of Ordovician. The Longmaxi formation of Silurian is a set of black shale with gray green muddy siltstone. The lithology of the Wufeng formation of Ordovician is gray dark silty mudstone that contain graptolite fossils
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