大地电磁测深在塔里木盆地油气勘探中的应用

大地电磁测深(MT)法已被广泛地应用于含油气盆地的普查勘探中.利用该方法在塔里木油气探区先后完成数条区域大剖面和一片面积普查工作.通过上述MT工作,在盆地内构造单元的区划、了解盆地与周缘褶皱带的构造接触关系、查找和圈走火成岩体、研究盆地深部地质结构等方面取得了较好的地质效果,并提出了许多新认识.尤其是对塔北和塔西南地区可能存在进掩推覆构造的推断以及盆地地壳上地幔高导层的发现,为该区油气勘探有利远景区的预测评价和盆地及周缘褶皱带的深部构造研究提供了重要信息.

Application of magnetotelluric sounding to hydrocarbon exploration in the Tarim basin

Magnetotelluric(MT)sounding has been widely used in the reconnaissance exploration of hydrocarbon--bearing basins.This method has been used to successfully finish the reconnaissance exploration of both some long lines and an area in hydrocarbon-bearing region in the Tarim basin.The MT reconnaissance work brings good effect in ascertaining both internal structural elements and relation between the basin and the peripheral fold belts,discovering igneous rock bodies and researching into deep geological structures,which improves people's understanding of the basin.Particularly,the inference of overthrust nappes in north southwest parts of the Tarim basin and the discovery of high conductive layer in upper mantle beneath the basin basement offer the very important informations from which we can predict favourable hydrocarbon-bearing areas and ascertain the deep geological striuctures of both the basin and the peripheral fold belts.