综合物探剖面揭示松辽盆地基底地质与地球物理特征——以过松科二井剖面为例  

The utilization of integrated geophysical profiles to reveal the basement geology and geophysical characteristics of the Songliao Basin: A case study of the profile of Well SK-2

作　　者：王天琪 韩江涛[1] 侯贺晟[2] 刘文玉 管彦武[1] 马国庆[1] 周子琨 WANG Tianqi;HAN Jiangtao;HOU Hesheng;LIUWenyu;GUAN Yanwu;MAGuoqing;ZHOU Zikun(College of Geoexploration Science and Technology,Jilin University,Changchun 130026,Jilin,China;SinoProbe Center,Chinese Academy of Geological Sciences and China Geological Survey,Beijing 100031,China;East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026 [2]中国地质调查局-中国地质科学院地球深部探测中心,北京100031 [3]东华理工大学,江西南昌330013

出　　处：《中国地质》2019年第5期1126-1136,共11页Geology in China

基　　金：中国地质调查局地质调查项目（DD20160207）;国家重点研发专项（2017YFC0601305）;国家自然科学基金青年科学基金项目(41504076)联合资助~~

摘　　要：松辽盆地是中国东北部中—新生代陆相沉积盆地,本文在深入分析东北地区古生代地层特征、沉积环境及构造演化基础之上,以过松科二井地区综合地球物理资料解译为基础,开展基底的属性和地球物理特征研究。松科二井南北剖面发现:布格重力异常具有中间高两边低的特点;磁异常呈现出与重力异常负相关的趋势;电性表现为浅部分层、高—低阻交叉重叠和深部分区的特征。东西剖面发现:布格重力异常具有西高东低的趋势;磁异常形态呈“碗状”;电性结构与南北剖面相比深部出现了高阻异常。结合地球物理特征与岩相古地理分析,得到以下结论:(1)上古生界晚石炭世至晚二叠世期间,具有浅海相、陆相、河湖相多种沉积环境,相应岩性组合具有不同的物性特征;(2)重磁电地球物理特征揭示了研究区基底主要由泥砂岩、大理岩和侵入岩组成,基底顶面埋深位于7 km左右,上古生界和侵入岩共同组成了研究区基底;(3)识别出了滨州断裂带、孙吴—双辽断裂带、海伦—任民断裂带以及深层次断裂体系的位置和走向,断裂构造主要以SN和EW向为主,它们作为构成古生代构造骨架的重要组成部分,控制着深部油气运移和贮藏。Songliao Basin is a Meso-Cenozoic continental sedimentary basin in Northeast China.Based on a detailed analysis of the Paleozoic stratigraphic characteristics,sedimentary environment and tectonic evolution in Northeast China,the authors conducted the interpretation of the comprehensive geophysical data across Well SK-2 to investigate the properties and geophysical characteristics of the basement in this paper.On the SN profile,the authors have found some phenomena:the Bouguer gravity anomaly in Well SK-2 is high in the middle and low on both sides;the magnetic anomaly shows a negative correlation with gravity anomaly;magnetotelluric properties are characterized by partial layers and high-low resistance crossover in the shallow part and partial regions in the deep part.On the EW profile,the gravity anomaly curve has the trend high in the west and low in the east;the magnetic anomaly curve is“bowl-shaped”;there exists a high resistance structure compared with features of the SN-trending profile.Combining geophysical characteristics with lithofacies palaeogeography,the authors have reached the following conclusions:1.From the Late Carboniferous to Late Permian in the Upper Paleozoic,there were many sedimentary environments such as shallow marine facies,continental facies,rivers and lakes.The corresponding lithologic combinations had different physical characteristics;2.The geomagnetic characteristics of the gravity,magnetic method and magnetotelluric sounding’s results reveal that the basement of the study area is mainly composed of mudstone,marble and intrusive rocks,and the burial depth of the roof of the basement is about 7km.The base of the study area is formed by the Upper Paleozoic and intrusive rocks.3.The location and orientation of the Binzhou fault zone,the Sunwu-Shuangliao fault zone,the Helen-Renmin fault zone and the deep fault system are identified.The fault structures are mainly dominated by SN and EW trending structures.They are important components of the Paleozoic structural skeleton and cont

关 键 词：浅基底属性 电性结构 上古生界 花岗岩 油气盆地 深地资源探测工程 松辽盆地 

分 类 号：P631[天文地球—地质矿产勘探] P545[天文地球—地质学]