Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 129-137.doi: 10.12108/yxyqc.20210313

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Well-logging evaluation index system of shale oil and gas reservoir of Da'anzhai member in central Sichuan Basin

HE Xuquan, HUANG Dong, ZHAO Ailin, LI Yucong   

  1. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
  • Received:2020-03-16 Revised:2020-06-10 Published:2021-06-03

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Abstract: Shale of Jurassic Da'anzhai member in Sichuan Basin is mostly featured by high TOC content, large thickness, and great physical property and hydrocarbon potential, which shows great development prospect. However, some methods to calculate key parameters of porosity and organic carbon content and other well-logging evaluation standards, which have been established for conventional oil and gas reservoirs and marine shale gas reservoirs, are not applicable for assessing shale oil and gas reservoirs in this formation. Based on petrophysical experimental analysis, and combined conventional well-logging data from natural gamma ray, acoustic, and resistivity logging with new technologies including nuclear magnetic resonance logging and lithological scanning logging, a model for calculating the key parameters of TOC content, porosity, gas saturation and free hydrocarbon(S1) content was established, and an evaluation index system was developed for shale oil and gas reservoirs of Da'anzhai member in central Sichuan Basin. The calculated results by the model agreed well with ones from core analysis, and the practices showed that the calculation model and the evaluation index system have an obvious application effect. The research results can provide an effective support in sweet spot selection, well-location deployment and well-testing plan optimization in old wells for shale oil and gas reservoirs in Sichuan Basin.

Key words: shale reservoir, TOC, porosity, evaluation index, well logging, Da'anzhai member, central Sichuan Basin

CLC Number: 

  • P631.8+4
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