黏弹TTI介质旋转交错网格微地震波场模拟

发布时间：2018-03-29 14:49

本文选题：黏弹TTI介质　切入点：旋转交错网格　出处：《石油地球物理勘探》2017年02期

【摘要】：基于Carcione提出的黏弹各向异性一阶速度—应力方程,采用旋转交错网格有限差分正演模拟方法,利用地震矩张量分解方法,将力源转化为速度源,并将其加载到旋转交错网格点上,实现了ISO、DC、CLVD等3种基础震源机制的旋转交错网格微地震震源加载,得到了微地震波场、微地震记录以及震源照明图,并分析了微地震信号的波场特征。结果表明:(1)微地震波场qP波和qSV波的能量相对关系以及qP波初动极性都仅仅受制于震源类型,与储层类型无关,可据此考察震源机制以及反演水力压裂裂缝参数;(2)微地震波场qP波旅行时仅仅受制于储层类型,与震源机制无关,可根据其同相轴曲率预测储层类型及性质;(3)微地震波场能量辐射方式受震源机制及储层类型等因素的影响,且存在较大差异,因此在实际观测系统布设时,要综合多方面先验信息,优选出主能量方位和有效辐射强度,从而设计出合理、高效的观测系统。
[Abstract]:Based on the first order velocity-stress equation of viscoelastic anisotropy proposed by Carcione, the force source is transformed into a velocity source by using rotating staggered grid finite difference forward modeling method and using Zhang Liang decomposition method of seismic moment. It is loaded on the rotating staggered grid, and the focal loading of three basic focal mechanisms, such as ISO DCO CLVD, is realized, and the microseismic wave field, microseismic record and focal illumination map are obtained. The results show that the energy relative relationship between QP wave and qSV wave and the initial polarity of QP wave are restricted only by the source type and independent of reservoir type. Therefore, the source mechanism and the inversion of hydraulic fracturing fracture parameter can be investigated. The travel of QP wave in micro-seismic field is restricted only by reservoir type and has nothing to do with the source mechanism. It can be used to predict reservoir type and property according to its cophase axial curvature. The energy radiation mode of micro-seismic wave field is influenced by the source mechanism and reservoir type, and there are great differences, so when the actual observation system is set up, A reasonable and efficient observation system should be designed by synthesizing the prior information and selecting the main energy azimuth and effective radiation intensity.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石油勘探开发研究院西北分院;
【基金】：国家自然科学基金项目(41374123;41504097) 山东省自然科学基金项目(ZR2013DQ020)资助
【分类号】：P631.4

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