Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 111-119.doi: 10.12108/yxyqc.20200112

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Three-parameter AVO inversion method of pore modulus based on PP and PS wave simultaneous joint inversion

DING Yan1,2,3, DU Qizhen1,2, LIU Lihui3, FU Liyun1,2, LENG Xuemei1,2, LIU Zixuan4   

  1. 1. Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266580, Shandong, China;
    3. Beijing Rock Star Petroleum Technology Co., Ltd., Beijing 100083, China;
    4. Sinopec International Petroleum Exploration and Production Corporation, Beijing 100029, China
  • Received:2019-06-22 Revised:2019-08-06 Online:2020-01-21 Published:2019-11-22

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Abstract: Equivalent fluid bulk modulus is a sensitive fluid indicator,which is of great significance in hydrocarbon identification of complex reservoirs. However,conventional single P wave AVO inversion method for fluid identification using Gassmann fluid factor has problems including poor precision,multi-solution,and ambiguous description of geological boundaries,which restricts the applications of these techniques in fluid identification. Based on rock physical model of two-phase medium,a new linear approximation of PP wave and PS wave Zoeppritz equation which consists of equivalent fluid bulk modulus,shear modulus of rock skeleton and porosityrelated gain was derived firstly. Then,simultaneous joint inversion was carried out under the constraint of Bayesian theory and Cauchy prior distribution with the combination of PP wave and PS wave data. The test results of Marmousi2 reservoir model show that compared with the inversion methods merely using PP wave data,simultaneous joint inversion based on independent PP wave and PS wave can provide more stable inversion results, higher accuracy and clearer description of geological boundary characteristics. The application in A oilfield proved the feasibility and robustness of this method. The proposed PP and PS wave simultaneous joint inversion method has certain reference for improving reservoir fluid identification.

Key words: simultaneous joint inversion, fluid identification, equivalent fluid bulk modulus, shear modulus, porosity

CLC Number: 

  • P631.4
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