漠河地区天然气水合物远景调查之——电法探测岩石性永久冻层的应用研究  

The prospective investigation of gas hydrate in Mohe region——the application research of using electrical method to explore the ever frozen layer

作　　者：张志厚[1] 刘国兴[1] 唐君辉[1] 韩江涛[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《地球物理学进展》2007年第3期887-895,共9页Progress in Geophysics

基　　金：中国地质调查局计划项目"我国陆域天然气水合物远景调查"项目(200410100001)资助

摘　　要：在东北天然气水合物远景调查中,解决多年永久性冻土的空间分布是一个关键性问题.但是利用电测方法确定基岩性永久冻土的空间分布比较复杂.为有效利用电测方法探测漠河地区永久冻土的空间分布,首先对漠河地区4口钻井岩芯进行了不同温度条件下的物性测试,并以此建立正演模型进行了正演模拟研究;在工作区永久冻层已知点做了方法有效性实验,获得了永久冻层与上、下非冻层的电性结构特征.在此基础上采用电阻率测深法和瞬变电磁法进行了实际探测,根据实测资料,对工作区永久冻层或与永久冻层相关电性层的空间分布做出了推断解释,利用点探槽对不同海拔高度的测点进行了验证.In the prospective investigation of the northeast gas hydrate, to solving the spatial distribution of ever frozen layer is a crucial problem. But using the electrical sounding method to confirm the spatial distribution of the ever frozen layer of bedrock is relatively complex. In order to use the electrical sounding method effectively to explore the spatial distribution of the ever frozen layer in Mohe region, first carried out the physical properties measurement of the drill cores got from the M1～ M4 well of Mohe region under different temperature condition, and founded direct models based on the measurement and then carried out the forward modeling research; second made the experiment of the method＇s validity at the known points of the ever frozen layer in the workaround, and acquired the electrical structure characteristics of the frozen layer and the non- frozen layer. Based on these research used the electrical sounding method and the TEM （transient electromagnetic） to explore in practice. Through the measured data, made the inferred explanation for the spatial distribution of the ever frozen layer or its relative electrical layer in the workaround, and validated the measuring points of different heights above sea level by utilizing the point exploratory trench.

关 键 词：天然气水和物 永久冻层 正演模拟 电阻率测深 瞬变电磁法 

分 类 号：P631[天文地球—地质矿产勘探]