多方法静校正融合技术在鄂尔多斯盆地黄土塬区中的应用  

Multiple statics fusion in loess tablelands,Ordos Basin

作　　者：高秦 陈超群 王智茹 田媛媛 牛中宁 王雪宁 

机构地区：[1]东方地球物理公司研究院长庆分院,陕西西安710021

出　　处：《石油地球物理勘探》2017年第A02期38-44,共7页Oil Geophysical Prospecting

基　　金：国家重大科技专项"鄂尔多斯盆地致密油开发示范工程"(2017ZX05069)资助

摘　　要：层析静校正不受近地表速度纵横向变化的约束,与折射波静校正相比,能较好地控制测线构造形态及解决长波长问题,但在局部测线段还存在高频成像叠加效果不如折射波静校正的现象,即单一静校正方法并不能完全解决黄土塬区的静校正问题。为此,结合以往黄土山地的静校正技术系列,针对层析静校正局部高频成像不好的区域,开发基于层析静校正的多种静校正高频重构与融合方法,并根据有效排列长度,将层析静校正与其他(矢量法、平均速度模型法、线性反演法等)静校正统一分解为低频分量和高频分量,再根据叠加数据体成像品质,选取各方法成像较好的区域进行高频重构,将重构后的高频量再与层析反演静校正低频量进行融合,形成最终的基础静校正量。将新方法应用于鄂尔多斯盆地东部黄土塬区实际二维地震资料,初叠加剖面既保证了中低频分量的可靠性,同时剖面的成像效果也明显得到改善。Near-surface structures of the loess tableland in South Ordos Basin are very complex.Low-velocity zones change dramatically in the area,so static corrections are one of the main difficulties all the time.Without near-surface velocity constraint,tomographic static corrections can better control structure forms and solve the long wavelength problem than refraction static corrections.But this approach cannot eliminate high frequency superposition at some line segments as refraction static corrections do.So we need to use multiple statics methods to completely solve statics problems in the loess tableland.Based on the tomographic static corrections and other statics modules of GeoEast System,we propose an approach of high-frequency component reconstruction and multiple statics fusion.2 Dseismic data sets of the area processed by the proposed approach show significant imaging improvement.

关 键 词：黄土塬区 层析反演静校正 折射波静校正 CMP参考面 高频分量 静校正量融合 

分 类 号：P631[天文地球—地质矿产勘探]