微动探测在钱家店凹陷的试验研究

Experimental study on micro motion detection in Qianjiadian depression

微动探测是一种将场地背景噪声当作信号源的天然源面波勘探方法,具有成本低、效率高等优势,近年来在探测地层速度结构、地热勘探中得到了广泛应用。本文通过在松辽盆地南部钱家店凹陷选择了不同的参数进行试验,通过分析对比不同参数的频散曲线,筛选出了在研究区中试验效果较好的参数,参数选择为最大半径160 m采集时长60 min的三重圆排列。通过对数据进行地球物理反演,并与钻孔资料进行对比,发现微动探测方法所划分的地层与钻孔结果相比较为吻合,为今后微动探测这一地球物理勘探方法在钱家店凹陷开展矿产资源勘查等工作提供了依据。

Micro motion detection is a natural source surface wave exploration method that takes the site background noise as the signal source. It has the advantages of low cost and high efficiency. In recent years, it has been widely used in detecting the formation velocity structure and geothermal exploration. In this paper, different parameters are selected for the test in Qianjiadian sag in the south of Songliao basin. By analyzing and comparing the dispersion curves of different parameters, the parameters with better test results in the test area are selected. The parameters are triple circular array with a maximum radius of 160 m and a collection time of 60 min. Through geophysical inversion of the data and comparison with the borehole data, it is found that the strata divided by the micro motion detection method are consistent with the borehole results, which provides a basis for the future geophysical exploration method of micro motion detection to carry out mineral resources exploration in Qianjiadian depression.