基于综合地球物理方法的隐伏线性构造探测

Concealed linear structure detection based on integrated geophysical method

地球物理勘探技术经过多年的发展,方法越来越多,技术越来越成熟,其在水文地质、矿产勘查中的地位与作用也越来越明显,而隐伏线性构造作为重要的导矿、导热、导水空间,一直是地质工作的重点和难点.研究以综合地球物理方法在山东省某第四系覆盖区的应用效果为例,对不同物探方法的应用效果做了对比分析,并进行了综合解释和成果推断.项目在隐伏区开展了音频大地电磁法、电阻率测深法、联合剖面法和高密度电阻率法探测,通过综合分析不同方法得到的视电阻率分布特征确定了断裂的位置及产状,划分了工作区的地层结构,为地热井的选址和结构设计提供了可靠的地球物理依据.结果表明,采用合适的综合地球物理方法,可在一定程度上减小数据反演的多解性和误差,提高隐伏线性构造探测的准确性和成功率.

After years of development,geophysical exploration technology has been developed with more and more methods and more mature technology.Its position and function in hydrogeology and mineral exploration are becoming more and more obvious.As an important ore guide,heat conduction and water guide space,the hidden linear structure has always been the key and difficult point of geological work.This study takes the application effect of comprehensive geophysical method in a Quaternary overburden area in Shandong Province as an example,and makes a comparative analysis of the application effect of different geophysical methods,and makes comprehensive interpretation and results inference.The project has carried out audio magnetotelluric sounding method,resistivity sounding method,combined profile resistivity method and high density resistivity method in the hidden area.The location and occurrence of fault are determined by comprehensive analysis of apparent resistivity distribution characteristics obtained by different methods.The formation structure of the working area is divided,which provides reliable geophysical basis for the location and structural design of geothermal wells.The results show that the multi solution and error of data inversion can be reduced to some extent by using the appropriate comprehensive geophysical method,and the accuracy and success rate of the detection of concealed linear structures can be improved.