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《Chinese Journal of Geophysics》 2018-03
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Microseismic focal mechanism inversion in frequency domain based on general dislocation point model

LI Han;YAO ZhenXing;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics, Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Fracture directionality,scale and stress state of hydraulic fracturing areas are extremely important for the exploration of unconventional oil and gas resources. These information can be obtained from the study of microseismic focal mechanisms.For microseismic events,double-couple or moment tensor models are usually used in focal mechanism inversion.In this study,a "Shear Tensile"general dislocation point model is presented to describe the source of microearthquakes.Based on this model, we develop an approach to calculate microseismic focal mechanism using amplitude spectra fitting and simulated annealing technique in frequency domain.The new method takes account of full waveform information including phase and polarities of first P wave arrivals and can provide dislocation length along each direction aswell as common source parameters(strike,dip and rake angles)in the study area.The synthetic tests on surface and borehole network and applications to real data show that our method is robust and efficient.We also find that shear and tensile dislocation lengths are independent of stress drop and can be used as new parameters for quantitative evaluation of hydraulic fracturing.
【Fund】: 国家自然科学基金项目(41390455)资助
【CateGory Index】: TE31
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【Citations】
Chinese Journal Full-text Database 8 Hits
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【Co-citations】
Chinese Journal Full-text Database 9 Hits
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5 Guo Qiang;Zhang Hongbing;Cao Chenghao;Han Feilong;Shang Zuoping;College of Earth Science and Engineering,Hohai University;Institute of Geology and Geophysics,Chinese Academy of Sciences;College of Mechanics and Materials,Hohai University;;Density-sensitivity analysis about prestack multi-parameter inversion based on the exact Zoeppritz equation[J];石油地球物理勘探;2017-06
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