摘要
针对井中微地震监测,在考虑介质模型为水平层状模型,且径向介质速度变化具有轴对称特点时,研究了微地震波场正演方法.根据数值模式匹配理论,在微地震波动方程正演模拟算法时,纵向采用解析递推方法、横向采用有限元数值方法.详细讨论了震源边界条件、地层界面边界条件及计算范围比较条件,并给出了具体的计算办法.同时,分析了有限元算法基函数关键问题.通过理论和实际资料论证和验证了研究方法的正确合理性,并与基于射线追踪的走时反演结果进行了对比分析,证明算法的精度能够满足微地震实际生产要求.
For borehole microseismic monitoring,considering the medium model of horizontal layered model,and axial symmetry characteristics of medium radial velocity variation,microseismic wave field forward method is studied.Based on matching theory of numerical model,finite element method is used in the transverse direction and analytical recursive method is used in the longitudinal direction in micro-seismic wave equation forward modeling algorithm.Discuss the conditions of source boundary,formation interface boundary,calculation range comparison in detail and give specific calculation method.Meanwhile,analyze key issues of basis function of finite element method.The correctness and rationality of the method can be validated by using theoretical model and actual data,comparative analysis with inversion results of travel time based on ray tracing,it is provedthat the accuracy of the algorithm can satisfy the requirements of the actual production of microseismic.
出处
《地球物理学进展》
CSCD
北大核心
2015年第6期2756-2759,共4页
Progress in Geophysics
关键词
井中微地震
模式匹配
基函数
边界条件
波场正演
borehole micro-seismic
pattern matching
basis function
boundary conditions
wave field forward
