针对塔里木盆地塔西南地区中-下奥陶统埋藏深度大（大于5000 m）、储层发育规模较小(小尺度溶孔-裂缝为主)的碳酸盐储层精细成像难题，将基于GPU平台的叠前逆时偏移技术应用于研究区562km2实际三维地震资料处理中，取得了较好的成像效果。通过地震剖面、平面相干属性和振幅属性对比分析叠前逆时偏移和传统叠前时间偏移结果表明：对于高陡构造带成像，逆时偏移成像效果局部好于叠前时间偏移；对于碳酸盐岩内幕“串珠”成像、缝-洞储层刻画方面，逆时偏移技术占有明显优势。叠前逆时偏移技术有效提高了研究区奥陶系碳酸盐岩缝-洞型储层成像的精度。%The lower-middle Ordovician carbonate is buried below the depth of 5000 m in the South-West Tarim Basin and the carbonate reservoirs developed in a small scale and are mainly fractured-vuggy type. The accuracy of imaging in this area is difficult. The pre-stack reverse time migration (RTM) established based on the GPU platform is used to improve the accuracy of imaging in fractured-vuggy carbonate reservoirs in this area. Both RTM and tradition pre-stack time migration are implemented to a 3D seismic data processing in an area of 562 km2 in study area. The comparison of the imaging results between reverse time migration and traditional prestack time migration by seismic profiles, coherency attribute and the rate of amplitude change show that the RTM method improves the local imaging in complex tectonic zone, and RTM method is obviously in a dominant position of the description of fractured-vuggy reservoirs and“string beads”.
展开▼
