渭河盆地深部基底结构特征研究  

Study on the Structure Characteristics of Deep Basement Structure in Weihe Basin

作　　者：张瑾爱 谷开拓 张林 周少伟 王双双 Zhang Jinai;Gu Kaituo;Zhang Lin;Zhou Shaowei;Wang Shangshang(Shanxi Mineral Resources and Geological Survey, Xi′an Shanxi 710068, China)

机构地区：[1]陕西省矿产地质调查中心,陕西西安710068

出　　处：《工程地球物理学报》2021年第2期171-177,共7页Chinese Journal of Engineering Geophysics

基　　金：中国地质调查局地质调查项目(编号:121201011000150014-12)。

摘　　要：为了探测渭河新生代盆地的基底结构特征,为氦等天然气选区评价提供依据,本次研究重点探明盆地基底组成和结构构造。本次工作在全面收集渭河盆地重、磁资料和钻孔资料的基础上,在渭河盆地开展大地电磁测深工作,利用重、磁资料,认识到渭河盆地深部基底结构整体呈“南北分带,东西分块”的特征;利用大地电磁测深和钻井资料进一步对其基底组成进行了划分:北部斜坡区主要为下古生界碳酸盐岩基底,中部坳陷区主要为上古生界泥岩基底,南部隆起区主要为太古界变质岩,西部隆起区主要为中生界碎屑岩基底。通过此次工作实践,对渭河新生代盆地的基底组成和结构构造有了清楚认识,对评价重点勘查区的成藏条件、渭河盆地油气调查与氦气战略资源远景评价提供了深部地球物理信息。In order to explore the characteristics of the basement structure of the Cenozoic basin in Weihe basin and provide a basis for the evaluation of natural gas selection areas such as helium,the basement composition and structure of the basin are mainly explored in this paper.Based on the comprehensive collection of the heavy,magnetic,and borehole data from the Weihe basin,the magnetotelluric sounding is carried out in the Weihe basin.using gravity and magnetic data to have a deeper understanding of the deep basement structure of the Weihe basin,and we have obtained that the overall basement of the Weihe basin is characterized by“north and south zones and east and west blocks”.The composition of the basement is divided by the use of MT and drilling data.The northern slope area is mainly the base of the lower Paleozoic carbonate rock,the middle depression is mainly the base of the upper Paleozoic mudstone,and the southern uplift area is mainly the Taikoo metamorphic rock,the western uplift is mainly the basement of Mesozoic debris rock.Through this work practice,a clear understanding is acquired of the basement composition and structure of the Cenozoic basins in the Weihe,which provides deep geophysical information for the evaluation of hydrocarbon accumulation in key exploration areas for the prospecting of oil and gas investigations and strategic evaluation of radon gas in the Weihe basin.

关 键 词：基底结构特征 大地电磁测深 基底组成 结构构造 

分 类 号：P631[天文地球—地质矿产勘探]