时频电磁约束反演在乌恰-阿图什构造带晚古生界油气勘探中的应用  

Application of time-frequency electromagnetic constraint inversion in oil and gas exploration in the Late Paleozoic of the Ucha-Atushi tectonic structure

作　　者：葛大壮 高永才 张振[2] 汪洋[2] 魏巍[2] 杨蕊菡 GE Dazhuang;GAO Yongcai;ZHANG Zhen;WANG Yang;WEI Wei;YANG Ruihan(College of Geophysics,Chengdu University of Technology,Chengdu 610059,China;Tarim Oilfield Company Petro China,Korla 841000,China)

机构地区：[1]成都理工大学地球物理学院,成都610059 [2]中国石油天然气股份有限公司塔里木油田分公司,库尔勒841000

出　　处：《物探化探计算技术》2025年第2期241-252,共12页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：随着能源需求的不断增长,古生界及以下深部地层的找油找气工作成为持续增产的新出路,乌恰-阿图什构造带是塔里木油气勘探的重点区块之一。该区域地下结构复杂,且受地形、地表条件等诸多因素的影响,致使地震资料深部的分辨能力有限。时频电磁法具有勘探深度大、高信噪比、不受地表条件影响等优势。笔者探讨了带约束的时频电磁法在该区域晚古生界油气勘探的适用性。选取了该区域内采集的时频电磁数据,依据电测井资料明确了电性标志层、构建约束模型后反演获得了电阻率及极化率剖面,依据上述剖面绘制了晚古生界地层展布等值线及顶面构造图。而后使用极化率剖面作为参考,明确了一个油气有利区。结果表明,乌恰-阿图什构造带受到基底卷入断裂F1的控制,在断裂两侧发育分别具有逆冲叠瓦与深部垂向堆垛的构造特征。晚古生界顶界面以F1为界,具有北西高、南东低的分布特征。在F1下盘5.42 km深度发现了一高极化率异常,判定为有利区,在后续的钻井资料中得到了验证。With the continuous growth of energy demand,oil and gas search in deep strata of the Paleozoic and below has become a new way to continuously increase production,and the Ucha-Artushi structure belt is one of the key blocks of Tarim oil and gas exploration.The underground structure in this area is complex and is affected by many factors such as topography and surface conditions,resulting in limited resolution of deep seismic data.The time-frequency electromagnetic method has the advantages of large exploration depth,high signal-to-noise ratio,and is not affected by surface conditions.This paper discusses the applicability of the constrained time-frequency electromagnetic method in Late Paleozoic oil and gas exploration in this region.Time-frequency electromagnetic data were selected for this area.The electrical marker layer was clarified according to the electrical logging data,the restraint model was constructed,and the resistivity and polarizability profiles were obtained by inversion.The contour contours and top surface structure maps of the Late Paleozoic strata were drawn according to the above sections.Then,using the polarizability profile as a reference,a favorable area for oil and gas was identified.The results show that the Ucha-Artushi tectonic belt is controlled by the basement induction fault F1,and has the tectonic characteristics of thrust shingles and deep vertical stacking on both sides of the fault,respectively.The top interface of the Late Paleozoic is bounded by F1,which has the distribution characteristics of high in the north west and low in the south and east.A high polarizability anomaly was found at a depth of 5.42 km in the lower wall of F1,which was judged to be a favorable area verified in the subsequent drilling data.

关 键 词：时频电磁 乌恰-阿图什构造带 晚古生界 极化率 油气勘探 

分 类 号：P631[天文地球—地质矿产勘探]