鄂尔多斯盆地西缘地区偏移成像技术研究  

Study on migration imaging technology in western margin of Ordos Basin

作　　者：苏海 高棒棒 邓卫斌 胥中义 文晓峰 董恩义 李爱荣 SU Hai;GAO BangBang;DENG WeiBin;XU ZhongYi;WEN XiaoFeng;DONG EnYi;LI AiRong(Department of Earth Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Key Laboratory of Hydrocarbon Accumulation of Shanxi Province,Xi'an 710065,China;Geological Research Institute of No.9 Oil Production Plant,Changqing Oilfield,CNPC,Xi'an 750006,China;Changqing Business,China Petroleum Logging Co.,Ltd.,Xi'an 710201,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]陕西省油气成藏地质学重点实验室,西安710065 [3]中国石油长庆油田分公司采油九厂地质研究所,西安750006 [4]中国石油集团测井有限公司长庆事业部,西安710201

出　　处：《地球物理学进展》2021年第2期662-667,共6页Progress in Geophysics

基　　金：国家自然科学基金项目(41772140);西安石油大学研究生创新与实践能力培养项目(YCS18212035,YCS20112014)联合资助.

摘　　要：鄂尔多斯盆地西缘地区地质构造发育,构造类型的多样化有利于油气的运移和储存,具有较好的勘探前景.由于构造的复杂性,静校正问题突出,准确建立速度场困难,深层成像精度差;绕射波、回转波发育,成像归位不准确.本文综合层析静校正技术和初至波剩余静校正技术计算静校正量,在精细速度分析的基础上建立偏移速度场模型,采用基于共炮检距域的Kirchhoff叠前时间偏移成像技术进行偏移成像,此方法对速度场精度要求低,计算效率快且成像精度高.结果表明:浅层静校正问题在一定程度上得到了解决,深层反射层能够较准确的分辨,偏移剖面上反映的地层信息丰富且成像归位准确,较好地刻画了研究区的构造形态,满足研究区的成像要求.The geological structure is developed in western margin of Ordos Basin,and the diversification of structural types is good for oil-gas migration and storage,which has a good prospect for exploration.Due to the complexity of structures,the problem of static correction is outstanding,the establishment of accurate velocity field is difficult,and the accuracy of deep imaging is poor;also the imaging position is inaccurate because of the diffracted waves and turning waves.To settle these problems,in this paper,tomographic static correction technology combined with first-break residual static correction technology are used to calculate static correction value;on the basis of fine velocity analysis,the velocity field for migration imaging is built;and Kirchhoff pre-stack time migration imaging technology based on common offset is used for migration imaging.The imaging accuracy of this method is high and the calculation efficiency is fast.The result shows that:the problem of static correction for shallow strata to some extent has been solved and the deep reflection layers can be resolved more accurately.What's more,the stratum information on the migration profile is rich and the imaging position is accurate.Overall,the structures of study area are better described which meet the imaging requirements of study area.

关 键 词：层析静校正 初至波剩余静校正 精细速度分析 偏移速度场 基于共炮检距域的Kirchhoff叠前时间偏移 

分 类 号：P631[天文地球—地质矿产勘探]