连续电磁剖面法在塔里木盆地麦盖提斜坡裂陷槽深部构造研究中的应用  

Application of continuous electromagnetic profiling method to the exploration of a rift depression in Maigaiti slope,Tarim Basin

作　　者：屈洋[1] 杨钰菡 黎立[1] 唐强强 孙迪[1] 罗强[1] 葛大壮 QU Yang;YANG Yuhan;LI Li;TANG Qiangqiang;SUN Di;LUO Qiang;GE Dazhuang(Research Institute of Petroleum Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China;Earth Exploration and Information Technology Key Laboratory of Ministry of Education,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国石油塔里木油田勘探开发研究院,新疆库尔勒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：《成都理工大学学报（自然科学版）》2024年第1期152-163,共12页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：塔里木油田公司项目(T202107)。

摘　　要：随着对塔里木盆地深层油气勘探认识不断深入,认为震旦—南华系裂陷槽对烃源岩的发育保存有着重要的控制作用,因此对该区域的裂陷槽探测是油气勘探的重要探索方向。前人研究认为对塔西南地区麦盖提斜坡处存在震旦—南华系裂陷槽,但受限于该区域地震资料品质,对该区域深层结构尤其是对基底和裂陷槽分布形态和范围认知不清。因此,通过一条跨过麦盖提斜坡与叶城凹陷的连续电磁剖面法剖面,结合研究区地质情况与井资料,构建了区域电阻率的物性分层结构,完成了对实际数据的二维反演,获取了该区域的深部电性结构与CEMP剖面的综合地质解释结果。为该区域新元古代裂陷槽发育情况的判断提供了新的电磁证据,也进一步刻画了基底、裂陷槽的电性特征与结构。探测结果认为裂陷主要由正断层控制,呈现裂陷群特点,裂陷多呈半地堑、不对称地堑及堑—垒相间的构造样式,在麦盖提斜坡、叶城凹陷处中部、南部的区域发育两个裂陷群,有利于区域内的烃源岩沉积,其中裂陷内震旦—南华系地层沉积较厚的区域具有较好的深层油气勘探潜力。With deepening understanding of the deep oil and gas exploration in the Tarim Basin,the Sinian-Nanhua rift trough plays a crucial role in controlling the development and preservation of source rocks.Hence,detecting the rift trough in this area is a pivotal exploration direction for oil and gas.Previous studies have suggested the existence of the Sinian-Nanhua rift trough in the southwestern Tarim area,particularly on the Maigaiti slope.However,due to the limited quality of seismic data in this region,our understanding of deep structures,especially the basement and the distribution and extent of the rift trough,remains limited.By implementing CEMP(Continuous Electromagnetic Profiling)section through the Maigaiti slope and the Yecheng depression in the southwestern depression,and correlating geological conditions with well data,we constructed a layered resistivity structure model.From the two-dimensional inversion of actual data,we derived both the deep electrical structure and comprehesive geological interpreation of the area.We provided new electromagnetic evidence for assessing the development of the Neoproterozoic rift trough in this region,and further delineated the electrical characteristics and structures of both the basement and rift trough,and our analysis suggested that the trough was predominantly controlled by normal faults,showcasing a pattern of half grabens,asymmetrical grabens,and alternating graben–horst structures.Two sets of rift troughs,evident in the central and southern parts of the Maigaiti slope and Yecheng depression,enhance the deposition of source rocks in the area.In regions where the Sinian-Nanhua strata are more prominent,there exists enhanced deep oil and gas exploration potential.

关 键 词：麦盖提斜坡 连续电磁剖面法 震旦—南华系 裂陷槽 烃源岩 

分 类 号：TE1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]