兴蒙造山带西南段深地震反射静校正研究

The study of statics correction of deep seismic reflection in the southwest of Xing’an Mongolian orogenic belt

静校正是深地震反射资料处理的关键技术之一,深反射剖面通常跨越多种不同的地质构造单元,地震地质条件复杂且变化较大,单一的静校正方法通常不能很好地解决深反射的静校正问题,针对兴蒙造山带西南段深反射地震数据进行静校正测试,最终选取多种静校正方法组合静校正技术,即针对不同地质条件分别应用折射和层析相结合来解决静校正问题。对于剩余静校正,采用模拟退火法解决,较好地解决了研究区的静校正问题,为资料后续处理提供借鉴。

Deep seismic reflection is usually arranged in complex orogenic belt,which brings about great difficulty in seisimic data processing,especially static correction.This paper focus on the static study in the southwest of Xingmeng metallogenic belt.Combined with the shallow velocity structure and geological in this area,we carried out refraction and tomographic tests,compare and analysis the result and reason of two kinds of statics.Combine refraction and tomographic is considered more suitable.Some tests are also carried out to select appropriate method for a large residual statics problem.Simulated annealing method is thought to be better than conventional method.Finally Tomographic static combined with simulated annealing method is a suitable method to solve the static problem in this exploration area and lay the foundation for the further processing.