石油与天然气地质 ›› 2000, Vol. 21 ›› Issue (4): 293-299,307.doi: 10.11743/ogg20000402

• 前沿探索 • 上一篇    下一篇

海洋阵列大地电磁测深法在辽东湾滩海深部地质构造研究中的应用

王东坡1, 曾效箴1, 薛林福1, 李桐林1, 刘立1, 陈义贤2, 廖兴明2, 孟卫工2, 李真济2   

  1. 1. 长春科技大学,吉林长春130026;
    2. 辽河石油勘探局,辽宁盘锦124010
  • 收稿日期:2000-04-19 出版日期:2000-12-25 发布日期:2012-01-16

OCEANIC ARRAY MAGNETOTELLURIC SOUNDING USED IN STUDY OF DEEP STRUCTURES IN BEACH SEA OF LIAODONG BAY

Wang Dongpo1, Zeng Xiaozhen1, Xue Linfu1, Li Tonglin1, Liu Li1, Chen Yixian2, Liao Xingming2, Meng Weigong2, Li Zhenji2   

  1. 1. Changchun University of Science &, Technology, Changchun, Jilin;
    2. Liaohe Petroleum Exploration Bureau, Panjin, Liaoling
  • Received:2000-04-19 Online:2000-12-25 Published:2012-01-16

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426

被引次数

13

摘要：

在对辽东湾滩海地区的海洋阵列大地电磁测深资料进行研究的基础上,结合地质、地震、重磁以及测井资料,利用二维有限元法对该区地质结构、构造特征进行了分析。结果表明郯庐断裂带对该区影响深远。郯庐断裂带北延部分在辽东湾地区有4条大断裂,其中二界沟-盖州滩断裂分割了该区古老的结晶基底,以东为鞍山群,以西为建平群;大洼海南断裂则控制了中上元古界的分布,中上元古界仅分布在该断裂西侧。郯庐断裂作为一整体又控制了中生界火山岩的分布,断裂西侧火山岩发育程度高于东侧。另外,利用电磁测深技术的勘探深度大这一优势,对该区进行了深部层圈结构的研究,幔内高导层的深度约为60km,是软流圈的反映,软流圈的起伏与该区的隆凹呈明显的镜相关系;壳内高导层的深度约为20km,是地壳在拉伸过程中形成的折离带的反映。

关键词: 海洋阵列大地电磁测深, 壳内高导层, 幔内高导层, 主干断裂

Abstract:

Based on the study of oceanic array magnetotelluric sounding data and the data of geophysical survey and well log,the geological texture and structural property of the beach area in Liaodong Bay were analysed with 2-D finite element method.The results indicate that Tanlu fault zone caused considerable effect on the area.The fault zone has four big fractures in Liaodong Bay,the Ejiegou-Jiezhoutan fracture among them cut deep into the crystal palaeobasement;another fracture,Dawa-Nanhai fracture,controlled the distribution of the Middle and Upper Proterozoic.The Middle and Upper Proterozoic were confined within the two sides of the fracture.What's more,as a whole,Tanlu fault also controlled the distribution of Mesozoic volcanic rocks,the volcanic rocks on the west side of the fault developed well than that on the east side.Besides,the superiority of great depth of electromagnetic sounding was also used to probe the deep texture of the globe.The result suggests that the depth of high conductive layer of the mantle is about 60 km,and that the undulation of the asthenosphere show distinct mirror relation;the depth of intracrustal high conductive layer is about 20 km.This is the reflection of detachment zone formed in earth crustal extension.

Key words: oceamic array magnitotelluric sounding, intracrutal high conductive layer, intramantle high conductive layer, principal fracture

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