Prestack seismic inversion of fluid factors in fractured reservoirs based on the global adaptive MCMC algorithm
ZHANG Jing1(), WANG Yong1, ZHAO Hui-Yan1, HENG De1, HUANG Jun2, ZHANG Xiao-Dan2, WANG Wen-Wen2, HE Yan-Bing2
1. Sichuan Changning Natural Gas Development Co.,Ltd.,Chengdu 610000,China 2. Chengdu Jiekesi Petroleum Natural Gas Technology Development Co.,Ltd.,Chengdu 610000,China
Fractured reservoirs typically exhibit anisotropic characteristics,and their fractures show different seismic responses when filled with fluids.Accurate identification of fluids in fractured reservoirs plays a significant role in indicating the hydraulic fracturing process in the late hydrocarbon exploration and production stage.This study adopted the concepts of normal and tangential fracture quasi-weaknesses and constructed a new indicative factor for fluids in fractures.Combining the linear slip theory, this study derived the elastic stiffness matrix expression of the fracture-induced HTI medium.Based on the scattering theory and the Born approximation equation,this study derived the linearized P-wave incident anisotropic reflection coefficient equation for the weakly contrasted interface.Moreover,this study proposed an improved global adaptive MCMC algorithm by introducing the adaptation strategy into the MCMC algorithm.The results show that:(1)In the absence of noise,the model testing results were highly consistent with the log data,with a consistency degree of above 90%;(2)The inversion results of the actual data aligned closely with the log interpretation results,and hydrocarbons were discovered through drilling in the target interval.As indicated by the results of model testing and actual data application in a study area in Southwest China,the prestack seismic inversion of fluid factors in fractured reservoirs,yielding highly consistent results with log interpretation data,demonstrates certain reliability and applicability and thus can achieve accurate fluid identification and hydraulic fracturing indication.
张婧, 汪勇, 赵慧言, 衡德, 黄君, 张晓丹, 王文文, 贺燕冰. 基于全局自适应MCMC算法的裂缝型储层缝隙流体因子叠前地震反演[J]. 物探与化探, 2024, 48(1): 105-112.
ZHANG Jing, WANG Yong, ZHAO Hui-Yan, HENG De, HUANG Jun, ZHANG Xiao-Dan, WANG Wen-Wen, HE Yan-Bing. Prestack seismic inversion of fluid factors in fractured reservoirs based on the global adaptive MCMC algorithm. Geophysical and Geochemical Exploration, 2024, 48(1): 105-112.
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