针对目标的非地震解释技术在鄂尔多斯盆地西缘的应用  

Non-seismic target-oriented interpretation techniques and application in the western edge of Ordos Basin

作　　者：李明瑞[1] 王学刚 于波[1] 姚志纯 张亚东 黄祥虎 LI Mingrui;WANG Xuegang;YU Bo;YAO Zhichun;ZHANG Yadong;HUANG Xianghu(Exploration Division,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710021,China)

机构地区：[1]中国石油长庆油田公司勘探事业部,陕西西安710021

出　　处：《石油地球物理勘探》2023年第6期1481-1488,共8页Oil Geophysical Prospecting

摘　　要：鄂尔多斯盆地西缘地质条件复杂,依靠现有的地震资料对地下复杂构造的解释和深部地层展布的预测成杲与实钻结果不符,为此,提出了针对目标的非地震解释技术思路,即在非地震常规处理的基础上,围绕地质需求进行针对性的处理与解释。针对走滑断裂体系发育的特点,采用重磁异常增强和体显示技术突出弱异常,再按不同方位进行照明分析,提取能够反映走滑断裂的非地震异常信息,结果可用于解释走滑断裂平面分布特征;围绕地震反射层“层断轴不断”的现象,即同一个反射层却是不同层位的反映,采用时频电磁解释性处理技术对目标层精细反演并联合地震进行地层属性的识别,多种信息综合分析后的结果使层位的归属更加准确;围绕深部地层地震反射成像困难的情况,对下古生界综合应用重力—地震联合剥层等多种技术进行处理,结果可用于深部长城系烃源岩的预测。The geology on the western edge of the Ordos Basin is complex,and the interpretation of complex underground structures and the prediction results of deep stratigraphic distribution based on existing seismic data are inconsistent with the actual drilling results.To this end,the technical idea of non-seismic interpretation is proposed.In other words,based on conventional non-seismic processing,the specific processing and interpretation focusing on geologic requirements will be reinforced.In view of the strike-slip fault development feature,the enhancement of gravity and magnetic anomaly and body display techniques are used to highlight weak anomalies,and then lighting analysis is carried out in different orientations to extract non-seismic anomalies that can reflect the strike-slip fault.The results can be used to explain the horizontal distribution of the strike-slip fault.In the case of the‘continuous axis but breaking layer’phenomenon on the seismic reflection layer,or in other words,the same reflective layer reflects different strata,the time-frequency electromagnetic interpretive processing technology is used to identify the strata attributes after the precise inversion of the target layer,and the result of comprehensive analysis of various information makes the stratigraphic attribution more accurate.For the deep strata where seismic reflective imaging is difficult to realize,gravity–seismic combined stripping can be applied to Lower Paleozoic strata,and the results can be used to predict the deep source rocks of the Changchengian system.

关 键 词：走滑断裂 深部地层 山前复杂区 鄂尔多斯盆地西缘 重力 磁力 时频电磁 

分 类 号：P631[天文地球—地质矿产勘探]