叠前深度偏移技术在李埠地区的应用

Application of Prestack Depth Migration in Libu Area

江汉盆地江陵李埠地区地下断层、构造复杂,速度横向变化剧烈,利用常规的叠后时间偏移技术很难得到高质量的地下地质信息。因此,针对江汉油田的Inline146、Inline166的地震资料,经GeoDepth软件的常规分析处理,其结果表明,叠前深度偏移剖面较叠后时间偏移有许多优点:断层成像效果好、偏移归位准确、复杂构造成像效果好等。

In Libu Area of Jianghan Basin, underground fault structure is complex, lateral velocity changes severely, it is very hard to obtain high-quality underground geologic information with conventional post-stack time migration. Therefore, based on the seismic data of Inline 146 and Inline 166 in Jianghan Oilfield, conventional analysis is made with GeoDepth software. The result shows that compared with post-stack time migration, pre-stack depth migration profile has many advantages, including better fault imaging, accurate migration homing and better effect of complex structural imaging.