叠前深度域偏移成像技术及其应用

Prestack Depth Migration Imaging Technology and Its Application

根据"西部煤炭资源高精度三维地震勘探技术"项目中对国内外各种深度域偏移成像方法和特点的调研成果,对各类深度域成像的算法和特点进行了总结,指出不同深度域成像算法选取原则主要依据构造复杂程度和横向速度变化情况。结合克希霍夫叠前三维深度域偏移模块说明深度域偏移原理和工作流程,并以实例说明叠前深度域成像能够解决因第四系地层厚度剧烈变化造成的下覆煤层赋存形态被扭曲、深度误差大、断层平面位置不准确等问题。该实例中,叠前深度域成像划分的煤层深度比时间域偏移剖面解释结果向下移动40多m,钻探结果证实其解释的煤层深度和断层位置比较准确。

This article summarized briefly investigation and study achievements of both domestic and foreign main depth migration methods and characteristics while participating in the seismic data processing attached work in the ＂western China coal resources high resolution 3D seismic prospecting technology＂. It explained 3D pre-stack depth migration principle and the work flow with Kirchhoff module. Through application examples it explained that the 3D pre-stack depth migration can overcome adverse effects on coal seam interpretation caused by overlying Quaternary strata thickness upheaval, enhanced interpretation precision of coal seam depth and faults. 3D pre-stack depth migration can solve structural problems in coalmines and has wide application prospect.