复杂地区速度场建立与变速构造成图方法研究

在复杂构造地区，用传统的Dix公式变速成图方法得到的叠加速度不准确，不适合于高陡倾角地层的速度转换，构造图的精度也较低.本文对复杂地区速度场建立与变速构造成图方法进行了深入研究，介绍了基于Dix公式转换法（改进后）、叠加速度反演法和CMP道集相干反演法三种速度场建立与构造成图方法的原理和思路，总结出了适合于复杂构造区的速度场建立与变速成图方法.通过在塔里木盆地的实际应用，这三种方法有效地提高了复杂地区速度场和构造图的精度, 具有良好的推广应用前景.

Methodology of establising velocity field and velovity variant depth Mapping

In complex survey,conventional velocity-variant depth mapping method with Dix equation conversion does not get exact stacking velocity,is not fit for velocity conversion of steep stratum and therefore precision of depth mapping is low.In this paper,methods of velocity filed building and velocity-variant depth mapping in complex survey were detailedly studied.Three methods of velocity field building and depth mapping,including improved Dix equation conversion method,stacking velocity inversion method and cmp gather coherency inversion method are introduced.Method of velocity field building and depth mapping was summarized in complex survey.Three methods have been applied to Tarim basin.The result is very good.Precision of velocity and depth mapping in complex survey was improved.Application of this method will be extended.