重力勘查工作中基于大样法的松散沉积层密度测定方法的改进

The improvement of density measurement method of loose sedimentary based on large sample method in gravity survey

在重力勘查工作中,尤其是第四系覆盖区的重力勘查工作中,准确测定松散沉积层的密度,对重力资料的改正、处理、反演、解释研究等都具有非常重要的意义。一直以来,重力勘查野外工作中,均采用规则形体大样法测定松散沉积层密度。然而,野外实际工作中很难获取一个规则形体的采样坑,因此,基于规则形体计算公式得到的采样坑体积与实际采样坑体积往往存在较大的误差,导致松散沉积层密度值测定不准确。本文采用一种符合野外实际情况的不规则六面体体积计算方法,对规则形体大样法进行改进,可更精确地测定松散沉积层密度值,并提高工作效率。

In the gravity survey,especially in the gravity survey of the Quaternary cover areas,it is of great significance to accurately determine the density of loose sediments for the correction,processing,inversion,interpretation and study of gravity data.For a long time,the density of loose sediments has always been determined by regular bulk sample method in the field of gravity survey.However,it is difficult for this method to obtain a regular sampling pit in field work.Therefore,there is a large error between the volume of sampling pit obtained from the calculation formula of regular shape and the volume of actual sampling pit,which leads to inaccurate measurement of density value of loose sediments.This paper presents a method which is the irregular hexahedron volume calculation method.This method is more suitable for the actual situation in the field,and can improve the traditional regular bulk sample method.This method can determine the density of loose sediments more precisely and raise the working efficiency.