Lithofacies Constrained Reservoir Physical Parameters Inversion Method and Device

Abstract

The invention discloses a lithofacies-constrained reservoir physical parameter inversion method and device, wherein the method includes: according to the Bayesian inversion framework, combined with lithofacies information, establishing a target inversion function based on lithofacies constraints; introducing lithofacies information, establish a statistical petrophysical lithofacies model; use stochastic simulation technology to generate elastic parameters and reservoir physical parameter training sample sets containing lithofacies information based on the statistical petrophysical lithofacies model; input pre-stack seismic inversion results data and lithofacies Data, use the training sample set to solve the target inversion function based on lithofacies constraints. The present invention uses lithofacies information as inversion constraint information, and by adding lithofacies constraints, the inversion principle is more rigorous, the inversion process is more reasonable, and the ambiguity of inversion results can be greatly reduced; the derived target inversion function Incorporating lithofacies information, the solution process is more targeted, and the results are more reliable; the favorable location of the reservoir can be accurately identified.

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 a lithofacies constrained reservoir. Background technique [0002] In recent years, the focus of my country's oil and gas exploration has gradually shifted to lithological oil and gas reservoir exploration. Different from structural oil and gas reservoirs, these new types of reservoirs are affected by the heterogeneity of structures and reservoirs, and have complex accumulation conditions, difficult identification and high investment risks. [0003] Oil and gas reservoirs often show strong reflection characteristics in seismic data, such as "bright spots". This seismic response feature may be caused by a reservoir with high porosity and high hydrocarbon saturation with great commercial production value, or it may be caused by a reservoir with low porosity and low hydrocarbon saturation with no commercia...

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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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