叠前时间偏移和共反射面叠加技术应用

Joint application of prestack time migration and common reflection surface stack

随着勘探进程的深入和天然气勘探的需要,针对深层地质目标的勘探越来越迫切、难度也越来越大。准噶尔盆地陆东—五彩湾地区石炭系火成岩天然气资源丰富,但由于该区石炭系目的层埋藏深、资料信噪比低,且火成岩反射不规则和波场复杂,给该区资料处理带来了很大的难度。在多域叠前去噪、视各向异性动校正等精细叠前道集处理的基础上,将叠前时间偏移技术和共反射面叠加技术相结合,在提高石炭系火成岩偏移归位精度的同时,有效地提高了火成岩低信噪比反射的成像效果,使该区针对石炭系火成岩的勘探攻关获得了重要突破,奠定了该地区天然气勘探资料处理技术的基础。

Deep geologic bodies have been becoming more and more difficult and important exploration targets along with the progress of exploration and the demanding for natural gas. The Carboniferous igneous rocks in Ludong-Wucaiwan region in Junggar Basin contain plenty of natural gas resources. However, the processing of the data from this region poses great challenges because of the deep Carboniferous targets, low SNR data, and complicated and irregular wavefield in the igneous rocks. On the basis of fine processing on prestack gathers, the author proposed jointly using prestack time migration and common-reflection-surface stack to improve the imaging of low SNR reflections from the igneous rocks while keeping the accuracy of migration. The method has yielded satisfactory results.