叠前弹性参数反演方法的关键技术

为实现对岩性和隐蔽油气藏的有效勘探,提出一种叠前弹性参数反演方法。该方法以Zoeppritz方程近似式为反演基础。通过比较不同介质条件下的Zoeppritz方程近似式的计算精度,确定适合的方程近似式。反演时,采用无拉伸动校正技术处理模拟的正演地震数据,使用射线追踪法抽取方程计算所需的角度道集。反演测试结果表明,相对于传统的叠后反演方法,该方法可以反演各种弹性参数,且反演结果的横向连续性强,可用于储层预测。

Pre-stack elastic parameters inversion method and its key technology

This paper introduces a novel pre-stack elastic parameter inversion method enabling an ef- fective exploration of lithologic and subtle oil-gas reservoirs. The method works by using the approxima- tion of Zoeppritz equation for inversion to determine a better approximations of equations by comparing the accuracy of approximations of Zoeppritz equations occurring in different media conditions. The inversion involves processing simulated forward modeling of seismic data using stretch-free NMO correction tech- nique and extracting the angle gathers required for the equation calculation, using ray tracing method. The inversion tests suggest that the method, capable of a variety of elastic parameters inversions, boasts a stronger lateral continuity of inversion results and holds a greater promise of predicting the reservoir, than the post-stack inversion method in current use.