Lithofacies constrained reservoir physical property parameter inversion method and device

Abstract

The invention discloses a lithofacies constrained reservoir physical property parameter inversion method and device. The lithofacies constrained reservoir physical property parameter inversion method comprises the steps of establishing a target inversion function based on lithofacies constraint according to a Bayes inversion frame and lithofacies information; introducing the lithofacies information to establish a statistical rock physical lithofacies model; utilizing a stochastic simulation technology to produce an elastic parameter and reservoir physical property parameter training sample set including the lithofacies information based on the statistical rock physical lithofacies model; inputting pre-stack seismic inversion result data and lithofacies data, and utilizing the training sample set to solve the target inversion function based on the lithofacies constraint. The lithofacies constrained reservoir physical property parameter inversion method and device uses the lithofacies information as inversion constraint information, enables an inversion principle to be more rigorous and enables the inversion process to be more reasonable by adding the lithofacies constraint and can greatly decrease multiple solutions of an inversion result. The derived target inversion function includes the lithofacies information, the solving process is more targeted, the result is more reliable, and the favorable position of a reservoir can be accurately recognized.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for inversion of physical property parameters of lithofacies-constrained reservoirs. Background technique [0002] In recent years, the focus of my country's oil and gas exploration has gradually shifted to the exploration of lithologic reservoirs. Different from structural oil and gas reservoirs, these new-type reservoirs are affected by structure and reservoir heterogeneity, and have complex accumulation conditions, difficult identification and high investment risk. [0003] Oil and gas reservoirs often show strong reflection features such as "bright spots" in seismic data. This seismic response feature may be caused by high porosity and high hydrocarbon saturation reservoirs with great commercial exploitation value, or may be caused by low porosity and low hydrocarbon saturation reservoirs with no commercial exploitation value. Reservoir ph...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that the above-mentioned prior art has the following disadvantages: when the conventional method establishes the petrophysical model, the petrophysical model established is quite different from the actual one.

In addition, the relationship between elastic parameters and reservoir physical parameters will produce greater uncertainty, which is not conducive to the inversion of reservoir physical parameters

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