Tight sandstone gas reservoir fluid mobility gradient attribute prediction method and system

By constructing a fluid mobility gradient attribute prediction method based on seismic frequency-varying reflection theory, the problem of unclear rock physical response in the prediction of fluid mobility parameters in tight sandstone gas reservoirs is solved, and high-precision prediction of fluid mobility is achieved.

CN121679706AActive Publication Date: 2026-03-17JILIN UNIVERSITY
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Patent Information

Application Number
CN202610187888.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-10
Publication Date
2026-03-17
Estimated Expiration
2046-02-10

AI Technical Summary

Technical Problem

Existing technologies have not yet established a method for predicting fluid mobility parameters in tight sandstone gas reservoirs that fully considers the physical implications of rocks, resulting in unclear seismic response mechanisms and difficulty in accurately predicting fluid mobility.

Method used

Based on the theory of seismic frequency-varying reflection, an expression for the reflection coefficient of the fluid mobility term is constructed, and a formula for calculating the dispersion property is derived. Combining the dual-pore rock physics model and propagation matrix theory, a synthetic seismic record is generated, and the dispersion properties of bulk modulus and shear modulus are extracted to calculate the fluid mobility gradient property.

Benefits of technology

A high-precision prediction method for fluid mobility has been achieved. By utilizing the seismic wave dispersion response of permeability and gas saturation, a high-precision prediction method for rock physics information has been provided, thereby improving the accuracy of fluid mobility prediction.

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Abstract

The invention relates to the technical field of oil and gas geophysical exploration, and particularly discloses a tight sandstone gas reservoir fluid mobility gradient attribute prediction method and system.The method comprises the steps that a reflection coefficient expression containing a fluid mobility item is constructed, and a formula for calculating fluid mobility through frequency dispersion attributes is deduced; constructing a fluid mobility gradient attribute related to the frequency and the incident angle of the seismic wave; the method comprises the following steps: establishing a double-pore rock physical model, generating a synthetic seismic record, applying frequency variation AVO inversion to the synthetic seismic record, and extracting a bulk modulus dispersion attribute and a shear modulus dispersion attribute; and calculating the fluid fluidity changing along with the frequency and the incident angle, and calculating the gradient attribute of the fluid fluidity based on a gradient attribute calculation formula and the fluid fluidity. According to the method, seismic wave frequency dispersion and attenuation response caused by permeability and gas saturation are fully utilized, the seismic gradient attribute of the fluid fluidity and the calculation method are constructed, and high-precision prediction of the fluid fluidity by applying seismic signal elasticity and frequency dispersion rock physical information is realized.
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