Pre-stack inversion method for frequency-dependent P-wave and S-wave attenuation parameters
XU Bin1,2, CHEN Xuehua1,2, ZHANG Jie2, JIANG Xiaomin2, LIU Junjie2
1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract:As seismic exploration progress develops, effective fluid identification methods are required to meet the demands of increasingly improved reservoir prediction accuracy. In this paper, according to an initial model of a two-layer reservoir designed by dynamic equivalent medium theory, an optimal sinusoidal fitting analytical formula between the reciprocal of quality factor and velocity is established, and the frequency-dependent P-wave and S-wave attenuation parameters are defined. In addition, an algorithm adopting attenuation parameters of pre-stack angle gathers and rock modulus inversion is constructed and verified by model calculation and real data. The results show that the P-wave and S-wave attenuation parameters are highly sensitive to reservoirs with fluids, and the attri-bute inversion results of attenuation parameters indicate that reservoirs with high gas saturation can be effectively identified. Specifically, the P-wave attenuation parameter is less disturbed by the background and can accurately identify gas reservoirs. Therefore, the proposed algorithm provides a new way to effectively identify fluids by using attenuation attributes.
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