Deep geologic structure inversion method and geologic structure interpretation method for petroliferous basin

Abstract

The invention provides a deep geologic structure inversion method and a geologic structure interpretation method for a petroliferous basin. The method comprises the following steps: acquiring rock physical property data, gravity, magnetic, electric and seismic geophysical data and conventional seismic geophysical data of a target area, wherein the rock physical property data of the target area comprises the resistivity, the density and the magnetic susceptibility of each layer series of the target area; obtaining a shallow structure map of the target area based on the conventional seismic geophysical data so as to obtain the seismic velocity of the target area; establishing a three-dimensional gravity-magnetic-electric model based on gravity-magnetic-electric-seismic geophysical data and regional rock physical property data; carrying out gravity-magnetoelectric three-dimensional joint inversion on the three-dimensional gravity-magnetoelectric model based on a preset first target functional by using the seismic velocity of the target region as a constraint to obtain a geologic structure inversion result of the target area, wherein the preset first target functional comprises an earthquake velocity parameter, and the geologic structure inversion result comprises the resistivity, the magnetization intensity and the density three-dimensional structures of different depths.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a deep geological structure inversion method and a geological structure interpretation method of oil-gas-bearing basins. Background technique [0002] The traditional single non-seismic inversion usually results in multiple solutions, lacks the ability to describe deep geological bodies, and cannot effectively solve problems such as the physical properties of deep strata and their residual thickness distribution. [0003] The joint inversion of gravity, magnetoelectricity is a hot spot and trend in the current geophysical inversion research. Different from single geophysical inversion, joint inversion needs to establish the correlation between different physical model parameters, that is, the joint or coupling of different physical parameters. This is the key to the realization of joint inversion. The more representative coupling methods can be divided into two cate...

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Problems solved by technology

The main problem in joint inversion research at present is that the joint inversion method represented by the empirical relationship of petrophysical properties is relatively dependent on prior information, and the physical property relationship of practical problems may have statistical differences or insufficient representation and change. It is complex and difficult to be generally applicable in the study of complex problems; in terms of joint methods represented by structural constraints, it is difficult to construct an intuitive or explicit method for the curvature threshold method and the Gramian determinant constraint method proposed by the predecessors, and implement them in detail Difficult to operate; current non-seismic methods do not make enough use of seismic and drilling constraint information in the joint inversion process, and existing methods are difficult to incorporate constraint information in the process, which largely restricts the integration of various geophysical methods and reliable constraint information Solve complex geological problems and enhance the uniqueness of the solution

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