Title

Study on stratum structure characteristics in TC Basin by using gravity，magnetic and electric data

单位

1.中国石油化工股份有限公司胜利油田分公司物探研究院，山东东营257022；2.内蒙古地质勘查有限责

任公司，内蒙古呼和浩特010020

Organization

Li Qin，Geophysical Research Institute of Shengli Oilfield Branch Company，SINOPEC，Dongying 257022，China

摘要

TC盆地勘探与研究程度很低，区域地质结构与地层展布尚不十分明确。统计分析露头与电测井资料

，建立该区岩性、地层密度、磁化率、电阻率模型，对2010年的两条区域重力、磁力、电法综合剖面做

了处理分析，结合区域重力资料和前人研究成果进行了解释。综合解释分析认为，区域断裂控制了基底

隆坳格局及石炭系沉积，TC盆地为“两坳夹一隆”结构，发育南、北两个石炭系—二叠系残留沉降带，分

别为额敏坳陷、库吉坳陷；下石碳统(C₁)分布广泛，其电性特征显示是一套低阻特征碎屑岩沉积地层，

是潜在烃源岩；上石碳统(C₂)—下二叠统(P₁)为火山岩建造，分布较为局限。分析认为，额敏坳陷为TC盆

地含油气相对有利区，建议进一步开展较高精度的综合物探工作。

Abstract

The exploration and relevant research of TC Basin is still at the early stage，and its regional geologic structure and

formation distribution is not clear.We analyze outcrop and electric logging data，and establish the geological

models of lithology，formation density，magnetic susceptibility and resistivity in this area.Two comprehensive

(gravity，magnetic and electric) profiles obtained in 2010 are processed，and interpreted combined with regional

gravity data and previous work achievements.it is shown that:① areal faults control the pattern of basement

elevation/ depression and the pattern of Carboniferous sedimentary；② TC Basin displays “two depressions

interbedding one uplift”；③ two C-P residual subsidence zones is developed separately in the southern and

northern TC basin，that is Emin Depression and Coogee Depression；④ C₁ is a set of clastic deposit widely

distributed with low resistivity characteristics as a potential hydrocarbon source rock；⑤ the distribution of C₂-P₁

volcano rock formation is more limited.The results indicate that Emin depression is relatively favorable zone for

hydrocarbon exploration and is suggested to carry out higher precision comprehensive geophysical survey.

关键词：

TC盆地; 物性; 重磁电; 电性层; 基底结构;

Keywords:

TC Basin; physical properties; gravity,magnetic and electric; electric layer; basement structure;

基金项目

DOI

10.3969/j.issn.1000-1441.2013.01.016

基于重磁电资料的TC盆地地层结构特征研究