Reservoir petrophysical parameter estimation with joint inversion of MCSEM and seismic AVA data
Peng Guomin1,2, Xu Kaijun1,2, Du Runlin2,3, Liu Zhan1,2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China; 3. Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China
Abstract:Seismic survey is the major approach to oil and gas exploration and development,but the ambiguity exists during estimating reservoir petrophysical parameters such as hydrocarbon saturation only with seismic data.Marine controlled-source electromagnetic (MCSEM) data is sensitive to resistive hydrocarbon reservoirs and thus aids seismic survey to increase the well drilling success rate.Therefore,the joint inversion of MCSEM and seismic data contributes to more reliable estimation of reservoir petrophysical parameters.This paper proposes an approach to estimate petrophysical para-meters with MCSEM and seismic amplitude variation with angle of incidence (AVA) data.The approach utilizes Archie's equation and Gassmann's equations to relate reservoir petrophysical parameters to the conductivity and seismic wave velocities as well as density,and adopts simulated annealing (SA) optimization algorithm to minimize the joint inversion objective function.Numerical experiments show that the joint inversion could estimate more reliable reservoir petrophysical parameters compared with only MCSEM or seismic AVA data inversion.Compared to the Occam method based on descent gradient,this inversion is independent from an initial guess.
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