煤田构造断裂带叠前时间偏移成像研究  

Study on Pre-Stacking Time Deviation Image of Structure Fracture Zone in Coalfield

作　　者：师素珍[1] 李雪梅[1] 张丽红[1] 袁莉[1] 李姗姗[1] 李礼[1] 喻梓靓[1] 胡海娟[1] 刘美辉 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]天津多波数传科技发展公司,天津300280

出　　处：《煤炭科学技术》2012年第3期105-108,121,共5页Coal Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB219603;2009CB724601);国家自然科学基金重大基金资助项目(40874071;40672104);"十一五"国家科技支撑计划资助项目(2006BAK03B01);国家创新研究群体基金资助项目(50221402);教育部"长江学者和创新团队发展计划"资助项目(IRT0408);教育部科学技术研究重大基金资助项目(306002);国家杰出青年基金资助项目(50025413)

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。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 di- ameter, 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.

关 键 词：煤田勘探 断裂带 叠前时间偏移 均方根速度场 偏移参数 

分 类 号：P631.4[天文地球—地质矿产勘探]