A dual-scale full-band petrophysical modeling method

By combining microscopic jet flow and mesoscopic patch saturation models, a dual-scale rock physics model was constructed, which solved the problem that existing technologies failed to comprehensively consider the effects of microscopic and mesoscopic fluid flow on seismic wave dispersion attenuation. This enabled more accurate estimation of rock dispersion velocity and attenuation, and provided a theoretical basis for reservoir prediction.

CN122110232APending Publication Date: 2026-05-29CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411723561.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing rock physics models fail to comprehensively consider the effects of microscopic and mesoscopic fluid flow on seismic wave dispersion attenuation, leading to erroneous estimates of rock dispersion velocity and attenuation.

Method used

By combining a microscopic jet flow model and a mesoscopic patch saturation model, the longitudinal and transverse wave velocities of rocks are measured using ultrasonic experiments, the soft porosity and aspect ratio distribution are inverted, the jet flow effect is iteratively calculated, a frequency-varying wet rock skeleton is constructed, and this skeleton is incorporated into the patch saturation model to form a dual-scale rock physics model.

Benefits of technology

It effectively simulates the propagation of seismic waves under actual reservoir conditions, provides rich stratigraphic and fluid information, offers more accurate parameters for reservoir prediction, and comprehensively considers wave-induced flow effects at both micro and macro scales.

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Abstract

The present application relates to a kind of double-scale full-band petrophysical modeling method, which is according to the inversion of target area rock P-wave and S-wave velocity, obtains the distribution of rock soft porosity and soft pore aspect ratio under different pressure;According to the distribution of rock soft porosity and soft pore aspect ratio, the frequency-dependent rock wet skeleton considering all aspect ratio soft pore jet flow effect is calculated using jet flow model;The frequency-dependent rock wet skeleton is brought into the frequency-dependent bulk modulus model of patch-saturated rock, and the petrophysical model considering micro and macro scale wave-induced flow effect is obtained.The present application comprehensively considers the influence of micro jet flow effect and mesoscale patch saturation, simulates the dispersion attenuation phenomenon caused by complex pore structure and complex fluid distribution of actual rock, and is more in line with the pore structure and fluid distribution in actual reservoir rock.
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