基于岩石物性引导的地球物理联合反演研究  

Joint inversion of geophysical data under the guidance of petrophysical properties

作　　者：连晟[1,2] 程正璞 罗旋 李敬杰 田蒲源[1,2] LIAN Sheng;CHENG Zheng-Pu;LUO Xuan;LI Jing-Jie;TIAN Pu-Yuan(Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding071051,China;Tianjin Engineering Center of Geothermal Resources Exploration and Development,Tianjin300300,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051 [2]天津市地热资源勘查开发工程研究中心,天津300300

出　　处：《物探与化探》2023年第6期1580-1587,共8页Geophysical and Geochemical Exploration

基　　金：地质调查项目“干热岩资源调查与勘查试采示范”(DD20230018);国家重点研发计划课题“干热断地热能资源评价方法与靶区优选”(2018YFB1501801)。

摘　　要：多元地球物理勘探资料的联合处理和综合解释是深部地热资源勘探评价工作必不可缺的环节,联合反演和后反演地质分异技术是目前深部资源勘探领域的2个研究热点。为融合多元地球物理场信息,降低单一地球物理场反演的多解性,本文利用岩石物性先验信息作为引导,以地震解释地层结构信息建立结构模型,采用高斯混合模型约束地层的地球物理参数,将重力、磁法、大地电磁进行正则化联合反演,实现了多物性结构的耦合,最终形成了重、磁、电、震联合反演软件,基于多物性联合反演的结果,利用Arrhenius定律,通过电阻率实现对典型干热岩场地温度场的预测。通过对直立六面体理论模型正演结果进行联合反演计算,联合反演结果相对于单独反演,对异常体的空间形态刻画以及物性数值恢复具有较好的效果,而且能够充分融合地质、岩石物性和地球物理等多元数据,更加符合实际规律。The joint processing and integrated interpretation of multi-source geophysical exploration data are indispensable to the exploration evaluation of deep geothermal resources.Joint inversion and post-inversion geological differentiation are two major hot research topics in deep resource exploration.To integrate the multi-source geophysical field information and reduce the inversion multiplicity of single geophysical fields,this study built a structural model using the stratigraphic structure information from seismic interpretation,with the prior information of petrophysical properties as a guide.This study constrained the stratigraphic geophysical parameters using the Gaussian mixture model and conducted regularized joint inversion of gravity,magnetic,and magnetotelluric data,thus achieving the coupling of multiple physical structures.Finally,this study developed the software for the joint inversion of gravity,magnetic,magnetotelluric,and seismic data.Based on the joint inversion results and electrical resistivity,this study predicted the temperature field at typical hot dry rock sites using the Arrhenius law.The forward modeling results of the theoretical model for cubic anomalies were used for the joint inversion.Compared with individual inversion,the joint inversion performs well in the spatial characterization of anomalies and the recovery of physical property values.Furthermore,the joint inversion can fully integrate multiple data on geology,petrophysical properties,and geophysics,thus well conforming to the actual conditions.

关 键 词：高斯混合模型 重、磁、电联合反演 岩石物性 先验信息 温度场预测 

分 类 号：P631[天文地球—地质矿产勘探]