Research On Electrical Characteristics And Formation Of Silicon Of Shale In Southwest Sichuan Province

The difference of sedimentary environment of marine shale can help us discover the gas reservoir area of shale,and the electromagnetic exploration mainly takes the difference of electrical characteristics of shale in the reservoir area and non-reservoir area as the premise,but the electromagnetic method is constrained to some extent due to more influence factors of electrical characteristics of shale reservoir.In order to help the electromagnetic method look for the area enriched with organic shale,this paper takes the relation among the physical property of shale reservoir,content of components of shale element and electrical characteristics of shale as the research content,and identifies and establishes the relation between the sedimentary environment of Longmaxi Formation marine shale and complex resistivity of shale by the means of impedance test method,analysis of physical model,determination of TOC content,analysis of major elements of XRF and other means.1.Conduct complex resistivity measurement of shale core of Longmaxi Formation in Southern Sichuan Province and research the induced polarization model,and then take the single Cole-Cole model,compound double Cole-Cole models,Dias model and Warburg model as the induced polarization physical model for forward modeling of specific parameters,and choose the specific model for inversion of spectrum of complex resistivity of shale to get the corresponding parameters based on the research of predecessors.2.Based on the measurement data of shale specimen,estimate the content of mineralogical composition of shale specimen,establish the relation between the fragile mineral,clay mineral,TOC of shale reservoir,four factors of pyrite and resistivity of shale in well in this area,and come to the following conclusions based on the measurement data: the relation between the content of pyrite and resistivity of shale specimen is negative,the relation between content of TOC and resistivity is negative,the fragile mineral and clay mineral are influenced with each other,and the resistivity of shale is influenced through changing the porosity.3.The quartz is the main ingredient of fragile mineral,and the cause of formation of silicon is determined based on the correlation of contents of elements of shale core specimen in new land No.2 well.Distinguish the segments of sedimentary environment of shale in this area.Give the predictive model of the depth of shale boundary layer in different sedimentary environments combined with the electrical characteristics of rock according to the relation of contents of difference elements between shallow water shelf and deep water shelf to provide help for looking for the organic shale formation.