井间地震波场数值模拟技术研究与应用

Numerical modeling of crosswell seismic wavefield and its application.

井间地震技术能够实现两井之间构造和储层等地质目标的高精度成像,数值模拟技术是研究地震波在井间传播规律的重要手段之一,可以帮助认识井间地震的复杂波场。利用声波方程建立井间波场数值模拟计算公式,选取一对实际井的声波测井资料建立了速度模型,进行井间数值模拟,得到了合成记录,对记录波场进行分析,能够清楚地观察到上、下行反射波和直达波的时距特征。不同观测系统设计参数的成像试验表明,数值模拟可以帮助优化野外观测系统的设计,降低井间地震的技术风险。

Crosswell seismic data provides precise images of struc- tures and reservoirs between two wells.Numerical modeling is one of important techniques that facilitate studying seismic wave propagation and identifying complex wavefield.With wave equation,we performed crosswell wavefield modeling. Velocity model is constructed from two sonic logs.It is readily distinguished the different characteristics of time-versus-dis- tance for direct,upgoing,and downgoing waves on the resulted section.Tests with different layout parameters show that nu- merical modeling can help optimize the design of layout and re- duce risks of crosswell seismic.