Physical modeling of the Bazhenov formation in combination with CSEM and seismic methods

V.V Ananyev,G.S Grigoryev,G.D Gorelik,V.S Litvinenko

doi:10.1051/e3sconf/202126607003

V.V Ananyev, G.S Grigoryev + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/202126607003

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Abstract

To predict the properties of the Bazhenov formation and to identify the areas in which oil deposits are localized the use of electrical prospecting methods is promising. The main goal of the current research is to evaluate the effectiveness of using Controlled Source Electro Magnetics (CSEM) exploration for the area forecast of the properties of the Bazhenov formation. The main objectives of physical modeling in this research are: Creation of an isotropic physical model corresponding to the electrical and elastic parameters of the section of the studied area, and performing 3D modeling on it with survey parameters that reproduce real seismic and CSEM surveys To convince that the contrast of the elastic properties and the ratio of the resistivity of the target interval of the Bazhenov formation and overlying rocks in the created physical model corresponds to the real petrophysical characteristics of the section of the studied area; Obtaining initial data for testing algorithms for synchronous inversion of seismic + electric and testing various approaches to processing and interpretation of CSEM and 3D seismic data.

Highlights

The oil and gas potential of non-traditional sources has not been estimated in Russia yet, but it far exceeds the volumes of developed oil and gas fields [1].Works on physical modeling include the creation of an isotropic physical model corresponding in the electrical and elastic parameters to the section of the studied area
The choice of an electrolytic tank as the basis for creating a physical model and conducting physical modeling of electromagnetic soundings is determined by the technical feasibility of measuring the electric and magnetic fields of the source used, i.e., a horizontal electric dipole in the frequency range determined by the required scaling factor [2]
The basic model consists of 4 layers and in general terms corresponds to the geological section of the study area from top to bottom: 1) sedimentary bed, 2) Bazhenov formation, 3) Jurassic sediments, 4) high-speed basement

Summary

Introduction

The oil and gas potential of non-traditional sources has not been estimated in Russia yet, but it far exceeds the volumes of developed oil and gas fields [1]. Works on physical modeling include the creation of an isotropic physical model corresponding in the electrical and elastic parameters to the section of the studied area. The material for creating the conductive inhomogeneities had to be selected on the basis of field tests of electrical and elastic properties. The model is created based on the conditions for modeling in an electrolytic tank available in Saint Petersburg State University with a size of at least 4 * 4 * 0.4 m, with a scale factor of 1:10 000. The choice of an electrolytic tank as the basis for creating a physical model and conducting physical modeling of electromagnetic soundings is determined by the technical feasibility of measuring the electric and magnetic fields of the source used, i.e., a horizontal electric dipole (line) in the frequency range determined by the required scaling factor [2].

Creating physical model

The results of the electromagnetic and seismic modeling

Conclusion