Simultaneous inversion of petrophysical parameters of reservoir based on cuckoo search algorithm
LIU Shiyou1, DUAN Zhichuan2, ZHOU Fan1, WANG Rui1
1. Haikou Branch of CNOOC Limited, Haikou, Hainan 570000, China; 2. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
Abstract：The inversion of petrophysical parameters is a significant method for reservoir prediction and evaluation, which can directly describe the abundant information contained in a reservoir. Due to the nonlinearity of geophysical inversion, it is difficult to reduce the ill-posed problems caused by this characteristic in the inversion of petrophysical parameters by local optimization, and thus the inversion results have multiple solutions. Given the above problems, this paper proposes a simultaneous inversion method based on the cuckoo search (CS) algorithm for petrophysical parameters of reservoir. On the basis of the relationship between elastic impedance and petrophysical parameters of reservoir, the inversion objective function is constructed, and the CS algorithm is introduced to find the optimal solution to the objective function. As a new meta-heuristic algorithm, the CS algorithm includes the Levy flight mechanism that can effectively solve the problems of local extreme values faced by conventional methods, and thus it can achieve high-precision prediction of petrophysical parameters of reservoir. The theoretical model and actual data test reveal that this method can effectively perform the inversion of petrophysical parameters, which can provide data support for re-servoir description.
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