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《Chinese Journal of Geophysics》 2018-03
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The ultrasonic response of numerical simulation and analysis of scattering characteristics in digital core for shale reservoir

WANG ZhiWei;FU LiYun;ZHANG Yan;WEI Wei;Key Laboratory of Petroleum Resource Research,Institute of geology and geophysics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
The precision and stability of the numerical algorithm is seriously challenged when applied to the modeling of strong heterogeneity on scales from micrometer to nanometer in the digital core of Longmaxi Formation shale at ultrahigh frequency.In this paper,we divide the major compositions in the digital core of Longmaxi Formation shale into four types,namely quartz,clay,pyrite and porosity.The liquid phase(oil)is assumed to be uniformly distributed throughout the medium.Based on the measured porosity and permeability of the digital core andthe prior petrophysical parameters of minerals,a heterogeneous two-phase model is elaborately established.Then,the scattering attenuation of the ultrasonic wave propagating in the shale core is simulated by using the high-precision finite difference(FD)method with rotating staggeredgrid and non-split convolution perfect matching layer(CMPL)based on Biot′s two-phase media equation.The boundary-reflection energy and its effects on coda waves can be numerically modeled by precisely controlling the number of matching layers.By comparing with the coda Q values measured in the ultrasonic experiment,we quantify the boundary-reflection energy and its effects on coda waves in the experiment.The results of ultrasonic numerical tests at various central frequencies show that the scattering attenuation comes to maximum at frequency of 600 MHz.According to the scattering pattern analysis in the L/a-ka diagram,we infer that the heterogeneity length of the shale digital core is equivalent to the order of ultrasonic wavelength at600 MHz.Based on the numerical simulation of the ultrasonic scattering in the shale digital core,the heterogeneity length of the core can be quantitatively evaluated,providing the basis for the prediction of acoustic heterogeneity in the shale reservoir.
【Fund】: 国家重点研发计划深地专项项目(2016YFC0601101);; 中国科学院战略性先导科技专项(B类)(XDB10010401);; 国家自然科学基金-青年科学基金项目(41604035)联合资助
【CateGory Index】: P618.13;P631.4
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Chinese Journal Full-text Database 5 Hits
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【Co-citations】
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1 WANG ZhiWei;FU LiYun;ZHANG Yan;WEI Wei;Key Laboratory of Petroleum Resource Research,Institute of geology and geophysics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;;The ultrasonic response of numerical simulation and analysis of scattering characteristics in digital core for shale reservoir[J];地球物理学报;2018-03
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