地震速度的曲线模型与作图方法

CURVILINEAR MODEL AND MAPPING TECHNIQUE FOR SEISMIC VELOCITY

青海石油局勘探开发研究院,敦煌736202

Research Institute, Quiyhai Managemend Bruean, Dunhuang 736202

本文提出用PC-1500微机直接偏移作图的一套新方法。新的方法对以往所用的作图方法从三个方面作了改进:(1)改换速度理论模型,以曲线模型代替直线模型。(2)以射线追踪空校方法代替圆弧空校方法。(3)以PC-1500主机直接偏移代替偏移数据表,使偏移作图更精确且简便易行。文中还对一些有关的问题进行了讨论,并给出了应用实例。

This paper suggests a new mapping technique implemented on PC-1500. The method make improvement in three respects: (1 ) use curvilinear velocity models instead of linear ones. (2) replace arcing method with ray-tracing for spatial correction, (3) directly implement migration process on PC-1500 instead of using migration tables. As a result, the migration and mapping jobs become more accurate and easy. Some problems associated with the new technique are studied with several applied examples.