音频大地电磁法在秭归盆地页岩气资源调查评价中的应用  

The Application of Audio Magnetotelluric Method to Investigation and Evaluation of Shale Gas Resources in Zigui Basin

作　　者：吴翔 吴先文 周硕 刘金涛 

机构地区：[1]湖北煤炭地质勘查院,湖北武汉430070

出　　处：《工程地球物理学报》2017年第4期392-400,共9页Chinese Journal of Engineering Geophysics

基　　金：湖北省国土厅资源厅页岩气资源调查评价项目(项目编号:EZC-2015-ZX0303/5)

摘　　要：在秭归盆地页岩气资源调查评价中,为了了解区内页岩层主要目的层的分布范围和埋藏深度,采用音频大地电磁法进行探测。首先利用音频大地电磁法具有不受高阻层屏蔽、对低阻层分辨灵敏、勘探深度大及适合山区勘探的特点,在野外数据采集过程中,采取了有力的技术措施,确保了数据采集质量;然后在数据处理时利用了先进的反演程序,由经验丰富的地球物理工作者,结合地质资料进行综合解释。探测成果基本查明了评价区内页岩层主要目的层的分布范围和埋藏深度,为页岩气地质参数钻孔的布设提供了有用的基础地质资料。结果表明,在页岩气资源调查评价过程中,利用音频大地电磁法进行探测,可以较好地了解区内页岩层目的层的空间分布情况,其探测效果明显,技术上可行,探测成果可为今后开展页岩气勘探开发提供借鉴依据。In the investigation and evaluation of shale gas resources in Zigui basin,the method of audio magnetism is used to detect the distribution range and burial depth of the main target layer in the shale layer.This paper firstly uses the audio magnetotelluric method which has the features of not being affected by high resistance layer,being sensitive to low resistance layer,and having deep exploration depth and being suitable for mountain exploration.In the process of field data acquisition,strong technical measures are taken to ensure the quality of data acquisition.Then,the experienced geophysical workers use the advanced inversion procedures to process data with the combination of geological data for a comprehensive interpretation.The results show that the distribution range and burial depthof the main target layer in the evaluation area are basically found,which provides useful basic geological data for the laying of shale gas geological parameters.In the process of shale gas resource investigation and evaluation,it is possible to understand the spatial distribution of the target layer in the area of the shale layer by using the audio magnetotelluric method.The detection effect is obvious and technically feasible.The results can be used for the future development of rock and gas exploration and utilization.

关 键 词：音频大地电磁法 秭归盆地 页岩气 应用 

分 类 号：P631.3[天文地球—地质矿产勘探]