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《Chinese Journal of Geophysics》 2015-02
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Reconstruction of the micro-seismic source vector field and fissure interpretation based on the anisotropy analysis

SONG Wei-Qi;XU Ben-Ben;YU Zhi-Chao;QIN Xuan;ZHANG Yu;School of Geosciences in China University of Petroleum;  
In order to improve the interpretation progress of fracture micro-seismic monitoring,in the view of micro-seismic vector field reconstruction,this work proposed the approach for reconstruction of the micro-seismic source vector field reconstruction and interpretation of cracks based on anisotropic conditions.Starting with analyzing characteristics of source radiation,we study the relationship between characteristics of rock fractures and response of seismic sources.By study of the variation characteristics of the travel-time and the transmission coefficient under the condition of the anisotropic VTI velocity model,we formed the calculation method of group velocity,phase velocity and transmission coefficient under the condition of anisotropy. Using horizontal component multidirectional characteristics of multi-stage geophones,we proposed a polarization analysis method of multi-stage geophone horizontal component,obtained horizontal characteristic vectors,overcame the incomplete information problem due to using the single-stage geophonehorizontal component polarization analysis to build feature vector,and formed a high-precision micro-seismic event location method and realized forward modeling of Gauss beam Green′s function in the anisotropic VTI velocity model.The results show that whether micro-seismic fracture interpretation is correct or not is closely related with source radiation characteristics.To get the complete source vector field,we should remove the influence of the formation.The anomalies of seismic travel time and amplitude caused by the formation anisotropy vary with different seismic ray incidence directions and the angles of incidence,the change showed significant in nonlinear characteristics,especially near the critical angle.Using multi-level detector components to build a complete horizontal component,it is possible to enhance accuracy and stability of positioning results.Using reconstruction the source vector field,and according to the vector field characteristics of rock fractures,this work formed a quantitative source vector field interpretation of crack fracture orientations and fracture sizes,Through test analysis of real data,we have verified the practicality of the method.
【Fund】: 国家高技术研究发展计划(863计划)(2011AA060303)“陆上非一致性时延地震;微地震油藏监测方法研究”课题资助
【CateGory Index】: P631.4
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