济阳坳陷罗家地区各向异性页岩储层全波场地震响应模拟及分析

doi:10.13278/j.cnki.jjuese.20170024

Abstract

Abstract: The intrinsic anisotropy and horizontal bedding in the shale reservoir in Luojia area of Jiyang depression results in the reservoir VTI(vertical transverse isotropy)anisotropy; while the existence of the vertical fractures in the VTI anisotropic background makes the reservoir orthorhombic. We took the orthorhombic medium as the model of the Luojia shale reservoir, and applied Backus averaging method to the VTI anisotropic well data in modeling in order to upscale the well data to the seismic scale. Further, by using Schoenberg's theory we introduced the vertical fractures in the orthorhombic medium with considering the factors of the fracture scale and fluid filling simultaneously,and used the reflectivity method to the full wave field seismic forward modeling for calculating and analyzing the AVAZ (amplitude versus azimuth) response of the orthorhombic shale reservoir, so that we could characterize the reservoir fractures with the azimuthal features of amplitude. The result shows that the azimuth-amplitude response of PP, PSV and PSH waves are significantly different from each other, and the fitting shape of the azimuth-amplitude polar diagrams reflect the development direction of fractures. These provide the evidence for seismic recognition of fractures in the shale reservoir.

Key words: orthorhombic, shale reservoir, Backus averaging method, vertical fractures, azimuthal anisotropy, Jiyang depression

CLC Number:

P631.4

Deng Xinhui, Liu Cai, Guo Zhiqi, Liu Xiwu, Liu Yuwei. Full Wave Field Seismic Response Simulation and Analysis of Anisotropic Shale Reservoir in Luojia Area of Jiyang Depression[J].Journal of Jilin University(Earth Science Edition), 2018, 48(4): 1231-1243.

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Full Wave Field Seismic Response Simulation and Analysis of Anisotropic Shale Reservoir in Luojia Area of Jiyang Depression

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