摘要
江西修武盆地页岩气勘探区近地表起伏剧烈,低降速带变化大,导致原始地震资料中存在严重的静校正问题。常规静校正技术存在一定的假设前提,其适应性在该区受到了限制,难以取得理想的效果。为此,提出了组合静校正思路,逐步地解决该地区地震资料的静校正问题。首先,利用初至波交互迭代剩余静校正技术优化更新野外静校正量,消除表层调查带来的中长波长静校正误差问题;然后,基于地表一致性剩余静校正技术,解决高频短波长静校正问题;最后,通过模拟退火剩余静校正和非地表一致性剩余静校正技术的联合应用,解决不满足地表一致性假设条件造成的残余静校正量问题。经实践检验证实,该组合静校正技术可以解决修武盆地地区静校正问题,将闭合差均控制在4 ms以内,较大地改善叠加剖面的成像质量。
The exploration region in Xiuwu Basin has rugged near surface,and its low velocity layers vary greatly,resulting that there exists serious static problem.Common static correction methods have some certain assumptions,resulting that it＇s of great difficulty to achieve the desired result by single static correction method in this area.Static problem has become a bottleneck restricting the region＇s further exploration work.Therefore,based on the near surface conditions,we proposed a joint static correction idea of combining various static correction methods to solve the serious static problem.Firstly,the first-break residual static correction method is used to refine the field statics,eliminating the errors caused by field surface survey and solving serious middle to long wavelength static problems.Then,surface-consistent residual static correction is used to correct the high-frequency residual short wavelength statics.Due to the assumption＇s limitation,surface-consistent residual static correction method often fails in low SNR region or the place which can not meet the assumption of surface-consistent condition.To make up for this deficiency,finally,simulated annealing and non-surface-consistent residual static correction are combined to correct the residual statics.The joint static correction idea is applied in the Xiuwu Basin and the final result shows it can effectively solve the serious static problem,and the mis-tie is less than 4 ms,greatly improving seismic imaging.
出处
《科学技术与工程》
北大核心
2018年第2期26-32,共7页
Science Technology and Engineering
基金
国家自然科学基金(41504095)
江西省教育厅青年基金(GJJ160570)资助
关键词
静校正
修武盆地
页岩气
组合静校正
地震成像
static correction Xiuwu Basin shale gas joint static correction seismic imaging
