叠前预处理技术

Prestack preprocessing technology

利用常规野外观测系统采集的地震数据进行积分法叠前偏移处理是不满足叠前偏移处理要求的,尤其在进行连片三维地震资料处理时,由于不同区块的资料存在严重的不一致性问题,因此存在更多不适于叠前成像的因素。本文主要针对GX断裂带叠前深度处理要求和叠前数据特点,对叠前地震数据规则化处理技术和叠前随机噪声衰减技术的使用技巧和参数选取进行了研究,提出了相应的解决办法,通过对实际地震资料的处理,使GX断裂带地区地震资料的断面形态更加清晰,潜山及其内幕成像清楚,解决了速度横向变化引起的叠后偏移归位不准确的问题,取得了理想的叠前深度偏移效果。

Using seismic data acquired by common field geometry to carry out the prestack migration by integration approach does not meet the need of prestack migration, especially processing the 3-D pieces-linked seismic data.Since the data in different blocks have seriously inconsistent problem, there are more factors unsuitable for prestack imaging. In view of the demand on prestack depth processing of GX fault belt and characters of the prestack data, the paper studied the regularized processing technique of prestack seismic data and the tricks of the usage and parameters selection of prestack random noise attenuation technique, and presented solution. It is showed by real seismic data processing that the configuration of fault planes in seismic data of GX fault belt was more distinctive, the imaging of buried hill and its interior was clearer, which solved the inaccurate issue of poststack migration positioning caused by lateral velocity variation and achieved ideal prestack depth migration results.