近地表约束层析静校正在新疆阿什里地区的应用

Application of the near surface restraint tomographic static correction in Ashley area in Junggar Basin

阿什里地区地处准噶尔盆地南缘山前带,工区地表条件复杂,以山地为主,主体处于伊连哈比尔尕山山前带,相对高差变化大,地形变化剧烈,地层推覆作用导致出露地层多样,产状多变,近地表结构复杂,单炮上的初至和有效同相轴表现出较强扭曲现象,静校正问题非常严重。为解决这一问题,地震资料处理过程中采用了近地表约束的层析反演静校正方法。该方法通过在层析反演中引入小折射和微测井信息,约束层析反演的初始模型,使最终反演出的近地表模型更加符合实际情况,有效地解决了该地区的野外静校正问题,提高了成像质量。

Ashiley area is located in the piedmont of the south of the Jungger Basin. The land surface conditions of the work area is complicated, and mainly consists of mountainous region, the main part is located at the piedmont of the Yilinhebilgen Mountain, the relative elevation changes greatly, the land modification change acute, the diversity of outcrop and attitude are caused by the strata napping, the first arrival and effective events of shot record show a strong distortion, all these result in a serious static correction problem. In order to solve the problem, the near surface restraint tomographic inversion static correction method are used in the seismic data processing. This method could make the final inversion near surface model accord with the actual situation by inputting the weathering and microlog information to restrain the initial model of tomographic inversion. In this way, the field static correction is effectively solved, and the quality of image is improved greatly.