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《Fault-Block Oil & Gas Field》 2015-03
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Numerical simulation of elastic wave field characteristics in low velocity fractured zone

Xiao Guangrui;Sun Chengyu;Tang Jie;Zhang Zhihan;Fang Bing;China University of Petroleum;  
Horizontal well fracturing is necessary when developing shale gas. In the process of fracturing, the fractured zones appear in the formation, which influences seismic wave propagation. An obvious phenomenon is the appearance of guided wave caused by low velocity fractured zone. Based on the crisscross of elastic wave equation and the forward modeling of variable grid high-order finite difference, this paper studies the elastic wave field characteristics of low velocity fractured zone. Aimed at the anisotropy and random characteristics of fractured zone, homogeneous anisotropic medium model and anisotropic random medium model are established and the numerical simulation of elastic wave field is conducted. The results show that low velocity fractured zone has locked up role on seismic wave energy; the wave field modeled by anisotropic medium model is clear, which is available for the analysis of shale gas reservoir fracturing; the random perturbation distribution caused by fracture is introduced, which results in a strong scattering in wave field.
【Fund】: 国家自然科学基金项目“基于石油勘探中地震面波信息的近地表参数反演方法研究”(41374123);; 国家科技重大专项课题“地震爆炸震源波场分析及高密度地震弱信号处理技术”(2011ZX05006-002)
【CateGory Index】: P631.4
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