【摘要】 为了提高顾桥矿南一、南二采区内断裂带构造成像精度,对地震勘探三维叠前时间偏移成像进行了研究。经分析勘探区地质资料和原始地震资料,采用保幅处理的方法得到了高信噪比的叠前道集,将偏移后的共反射点道集反动校后多次迭代修改均方根速度,并由此建立了精确的均方根速度场,选取了合适偏移算法及多种偏移参数———偏移孔径、拉伸算子、反假频算子等,最终完成叠前时间偏移。结果表明:所得到的剖面与叠后时间偏移相比横向连续性明显增强,信噪比提高,并且偏移归位与钻孔揭露情况吻合程度高。叠前时间偏移特别适合煤矿复杂地质条件下断层构造相对密集的小地块三维地震资料处理。更多还原

【Abstract】 In order to improve the accuracy of the structural images in the fracture zone of the south No.1 and No.2 mining block in Guqiao Mine,a study was conducted on the time deviation images of the seismic exploration before 3D stacking.With the analysis on the geological information and the original seismic information of the exploration area,the preserved amplitude processing method was applied to obtain the channel collection of the high signal and noise ratio before the stacking.The joint reflection point channel collection after the deviation was applied to iterate and revise the mean square root after reversed correction.Then an accurate mean square root velocity field was established.The suitable deviation displacement algorithm and the different deviation parameters including the deviation borehole diameter,stretching operator,anti-aliasing operator and others were selected.Finally the time deviation before the stacking was completed.The results showed that the cross section obtained and the time deviation after the stacking would be more obvious in comparison with the lateral continuity,the signal and noise ratio was improved and the deviation profile and the borehole exposed condition could be highly met.The time deviation before stacking could be specially suitable to process the 3D seismic information of the small with fault structural relatively compacted under the complicated geological conditions in coal mine.更多还原