基于视电流参数变化的断层识别方法

A fault identification based on the parameter variation of apparent current

在对目前常规广域电磁资料断层解释方法局限性分析的基础上,提出1种基于视电流参数变化的断层识别新方法——视电流法。视电流法基于广域电磁理论,结合断层产生机理,以广域电磁资料为研究对象,将地电断面与虚拟-等效电路建立联系,以虚拟-等效电路为载体,应用视电流理论公式,结合研究区的地质背景,实现对广域电磁勘探资料断层发育位置的科学性推断。理论模型测试和应用实例证明,可以根据视电流在地下空间的变化趋势来准确推断地下断层的发育位置,降低电磁资料解释的多解性。同时,也验证了视电流理论公式的正确性及视电流方法的可行性。

A new fault identification method,which is called the apparent current method,based on the parameter variation of apparent current is proposed after the analysis of the limitations of the fault interpretation method for the wide area electromagnetic data in the non-seismic exploration for oil and gas exploration.This method takes the study of the wide field electromagnetic theory and the mechanism of the fault generation,this method takes the wide field electromagnetic data as the research object,and establishes the connection between the geoelectric section and the virtual equivalent circuit,and then uses the virtual equivalent circuit as the carrier,and applies the theoretical equation of the apparent current,and combines the geological background of the study area to achieve scientific inference for location of fault in wide field electromagnetic exploration data.Theoretical model tests and the application of practical data proved that the location of underground fault can be accurately deduced by the trend of apparent current in underground space,reducing the multiple interpretations of electromagnetic data interpretation.At the same time,it also verified the correctness of the theory of apparent current and the feasibility of the method of apparent current.