各向异性速度分析技术在西部DH地区的应用

The Application of Anisotropic Velocity Analysis in the Western DH Exploration Area

西部DH地区地下构造复杂,地层埋深较深,地震资料采集中炮检距较大,地下介质的各向异性问题较为明显。由于常规速度分析方法精度较低,影响地震资料的成像质量。针对该问题,重点对横向各向同性(VTI)介质速度分析原理、各向异性参数求取方法进行了研究,总结了一套各向异性参数求取的方法。通过模型试算和西部DH地区资料的实际应用表明,各向异性速度分析技术是提高速度分析精度、改善成像效果的有效方法。

The oil reservoir was buried deeply and the underground structures were complicated in the western exploration area,where existed large offset in seismic data acquisition,the anisotropy in seismic wave propagation became a serious problem.The conventional methods of velocity analysis were inaccurate and affected the quality of migration imaging results.Aimed at the problem of current seismic velocity analysis,the principle of anisotropic velocity analysis and the compute method of anisotropic parameter were mainly researched.Based on the model calculation and actual application of data from the western DH Area,it shows that the method for velocity analysis is the effective way for improving imaging accuracy.