Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 113-121.doi: 10.12108/yxyqc.20190113

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Prediction method of shale formation pressure based on pre-stack inversion

LI Yufeng1, SUN Wei2, HE Weiwei3, YANG Yunfei4, ZHANG Xinwen4, YAN Yisheng4   

  1. 1. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Research Institute of Exploration & Production, Sinopec, Beijing 100083, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    4. Research Institute of Exploration and Development, PetroChina Henan Oilfield Company, Zhengzhou 450018, China
  • Received:2018-08-18 Revised:2018-10-13 Online:2019-01-18 Published:2019-01-18

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Abstract: With the deep exploration and development of shale gas,formation pressure prediction has become an urgent problem to be solved. Taking shale gas reservoir of Silurian Longmaxi Formation in Jiaoshiba area as the research object,the applicability of traditional formation pressure prediction methods was analyzed. Based on the analysis of logging response characteristics of abnormal pressure development zone of shale gas reservoir,a new parameter,namely abnormal formation pressure factor,was proposed to effectively identify abnormal formation pressure of shale gas. The pre-stack elastic impedance inversion result was used to calculate the abnormal formation pressure factor,so as to predict the pressure distribution characteristics of shale formation in Jiaoshiba area. The prediction result of the new method shows higher accuracy than that of the traditional method. This research results can be applied to pressure prediction of shale formation and provide a theoretical reference for fine exploration of shale gas.

Key words: abnormal formation pressure, elastic impedance inversion, pressure prediction, shale gas

CLC Number: 

  • TE121.34
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