高密度电阻率法多剖面二维勘探数据的三维反演及应用  

3-D inversion of the high density resistivity method based on multi profiles 2-D exploration data and its application

作　　者：戴前伟[1] 肖波[1] 冯德山[1] 

机构地区：[1]中南大学地球物理勘察新技术研究所,长沙410083

出　　处：《工程勘察》2011年第4期84-89,共6页Geotechnical Investigation & Surveying

基　　金：国家科技支撑计划项目(2007BAK24B02);国家自然科学基金资助项目(40804027;41074085);教育部博士点新教师专项科研基金项目(200805331082);湖南省自然基金重点项目(09JJ3084)

摘　　要：目前高密度电阻率法所采用的数据资料处理方法主要是把地质结构体视为二度体进行二维处理,而实际的地质结构体大都为三度体或似二度体,从而二维数据资料处理结果只是一种近似解释,其计算精度与反演效果都不佳,对测区多条断面进行综合解释的难度大。然而在实际勘探工作中,受自然条件和工作成本的影响,三维勘探原始数据的获得一般较少,数据勘探仍以二维为主,这样利用二维勘探数据进行三维反演显得尤为重要。本文结合了广东某地高密度电阻率法对岩层划分的工程勘察实例,利用二维勘探的数据进行三维反演,并对二、三维反演结果进行对比,结果表明三维反演在岩层划分中更能凸显岩层分界面区域及岩层的空间分布,而岩层与覆盖层的整体连续性也得以更真实的体现,与钻探结果吻合更好。Currently,the 2-D data processing adopted by the high density resistivity method regards the geological structures as two degrees,However,most of the actual geological structure is three degrees or fitting two degrees,which makes the result of the two-dimensional data inversion is only an approximate interpretation,the calculation accuracy and effect of the inversion are not the best,and it is too difficult to interpret many sections of the survey area.However,in actual exploration work,the raw 3-D exploration data acquisitions are usually less due to the impact of the cost of work and natural conditions,2-D data exploration is still dominated.Therefore,it is extremely important to performed 3-D inversion using the 2-D exploration data.This paper combines with the engineering investigation example of the high-density resistivity method for rock stratum partition in Guangdong,performed 3-D inversion using the 2-D exploration data,and compares with the inversion results of 2-D inversion and 3-D inversion,the results shows that the 3-D inversion divides the boundary area of rock stratum more prominently,the slice of 3-D reflected the spatial distribution of rock stratum and the overall continuity of covering layer and rock stratum,and the coherence with drilling results is better.

关 键 词：高密度电阻率法 二维反演 三维反演 岩层划分 

分 类 号：P631[天文地球—地质矿产勘探]