An Intermediate Reference Datum Static Correction Technique and Its Applications  

中间参考面静校正技术及应用效果(英文)

作　　者：钱荣钧[1] 冯泽元[1] 李培明[1] 杨晓玲[1] 

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司

出　　处：《Applied Geophysics》2005年第2期80-84,i0001,共6页应用地球物理（英文版）

摘　　要：Static corrections using the conventional method are basically conducted in two steps, the weathering correction followed by the correction from the top of the sub-weathering to the unified datum. However, the conventional method fails to well deal with statics problems in case the top of the sub-weathering is sharply undulated and the lateral velocity of the sub-weathering varies significantly. This brings us to the introduction of a smooth intermediate reference datum （IRD） located under the top of the sub-weathering, which helps to further increase the accuracy of statics based on the weathering corrections, and ensures the imaging quality. Good results based on the IRD technique have been achieved in the complex areas in western China. This paper discusses the IRD functions, its application requirements, and selection of related parameters. Some typical sections for comparison are also given in this paper.常规静校正方法是先做低降速带校正,再做从高速层顶界面到统一基准面的校正。当高速层顶界面起伏剧烈和高速层速度横向变化较大时,这种静校正计算方法就不能很好解决静校正问题。中间参考面静校正技术是在静校正计算时,在高速层顶界面之下引入一个圆滑的参考面,这样可以在低降速带校正的基础上进一步提高静校正精度,确保成像效果和构造精度。该项技术在中国西部复杂地表区推广应用后取得了良好的效果。本文系统介绍了中间参考面的意义、应用条件及参数的选取,同时展示了部分典型效果对比资料。

关 键 词：Intermediate reference datum static correction weathering correctioncomplex surface and velocity variation 

分 类 号：P631.4[天文地球—地质矿产勘探]