时频电磁法在巴什布拉克-乌泊尔构造带深部结构勘探中的应用  

Application of time-frequency electromagnetic method in the exploration of deep structures in the Bashibulak-Upor tectonic belt

作　　者：魏巍[1] 高文龙 王腾宇[1] 高永才[2] 张振[1] 葛大壮 袁菎铭 姚孟远 WEI Wei;GAO Wenlong;WANG Tengyu;GAO Yongcai;ZHANG Zhen;GE Dazhuang;YUAN Kunming;YAO Mengyuan(Tarim Oilfield Company,PetroChina,Korla 841000,China;Key Laboratory of Earth Exploration and Information Technology,Ministry of Education,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]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 [2]成都理工大学地球勘探与信息技术教育部重点实验室,成都610059

出　　处：《物探化探计算技术》2024年第3期332-340,共9页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：利用时频电磁数据资料,并结合测井资料约束提高电磁反演结果的分辨率,探讨塔西南西部地区巴什布拉克构造带和乌泊尔构造带深层电性结构及其油气分布区域。该区域地形、浅地表形态以及深层地质结构都较为复杂,无法得到有效的地震资料,严重制约了目标层的油气勘探。时频电磁具有勘探深度大,信噪比高,不受高阻屏蔽的优点。通过对巴什布拉克-乌泊尔区域时频电磁资料进行处理解释,有效识别了该区域的主要断裂及褶皱。南北向和西北向的反演电阻率剖面和极化率剖面,展示了塔西南凹陷同时受南天山和西昆仑山双向挤压的电性结构特征,两侧分别形成逆冲推覆体,呈对冲构造形式,覆盖于塔西南凹陷之上,两侧推覆体发育多排逆冲断层,呈叠瓦状分布,其南侧为乌泊尔构造带,北侧为巴什布拉克构造带,与盆地呈现明显的断层接触关系,南北两侧为区域性大断裂。Using time-frequency electromagnetic data and logging data constraints to improve the resolution of electromagnetic inversion results,the deep electrical structure and oil and gas distribution areas of Bashkbulak Belt and Upoer Structural Zone in the southwest and western regions of Taxian were discussed.This area's topography,shallow surface morphology,and deep geological structure are relatively complex,and effective seismic data cannot be obtained,which seriously restricts the oil and gas exploration of the target layer.Time-frequency electromagnetic has the advantages of large exploration depth,high signal-to-noise ratio,and is not subject to high-resistance shielding.The main faults and folds in this area were effectively identified through the processing and interpretation of the time-frequency electromagnetic data of the Bashibulak-Upor region.The inverted resistivity profile and polarizability profile in the north-south and northwest directions show the electrical,structural characteristics of the southwest depression of the tower being extruded by the South Tianshan Mountain and Kunlun Mountain simultaneously.The two sides form a thrust pushover in the form of a hedge structure,covering the southwest depression of the tower,and the pusher on both sides develops multiple rows of thrust faults,which are distributed in a shingle pattern;the south side is the Wupoer tectonic belt,the north side is the Bashkbulak tectonic belt,and the basin shows obvious fault contact relationship,and the north and south sides are regional large faults.

关 键 词：塔西南 时频电磁 区域构造 电阻率和极化率 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]