Oil saturation determination method and device based on oil reservoir condition and storage medium

By constructing a rock minimum connectivity pore size characterization model and combining microscopic pore structure and nuclear magnetic resonance logging data, the problem of inaccurate evaluation of oil saturation in tight reservoirs was solved, and accurate assessment of oil and gas reserves was achieved.

CN122449645AActive Publication Date: 2026-07-24XINJIANG PETROLEUM ADMINISTRATION BUREAU +2
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Patent Information

Application Number
CN202610916999.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-24
Publication Date
2026-07-24
Estimated Expiration
2046-06-24

AI Technical Summary

Technical Problem

Existing technologies are insufficient to accurately assess the oil saturation at different depths in tight reservoirs, leading to inaccurate oil and gas reserve assessments.

Method used

By acquiring the microscopic pore structure characteristics, formation pore pressure, and nuclear magnetic resonance logging T2 spectrum of the target well, a dual-pressure nuclear magnetic resonance joint measurement experiment was conducted to construct a rock minimum connected pore diameter characterization model, determine the rock minimum connected pore diameter and maximum capillary force, and accurately calculate the oil saturation by combining the minimum pore diameter for oil and gas injection and key relaxation time points.

Benefits of technology

This improves the accuracy of characterizing the oil saturation of tight reservoirs at different depths in target wells, ensuring the precision of oil and gas reserve assessment.

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Abstract

The invention discloses an oil saturation determination method and device based on an oil reservoir condition and a storage medium, and belongs to the technical field of oil-gas exploration and development. The method comprises the following steps: acquiring target micro-pore structure characteristics of a target well at a target depth, formation pore pressure, a nuclear magnetic resonance logging T2 spectrum of the target well and a plurality of core samples; performing a dual-pressure nuclear magnetic combined measurement experiment on each rock core sample to construct a rock minimum connected aperture characterization model; based on a rock minimum connected pore size characterization model, determining a rock minimum connected pore size according to the target micro-pore structure characteristics; determining the maximum capillary force according to the minimum communicating aperture of the rock; according to the formation pore pressure, the maximum capillary force and the minimum rock communication pore diameter, the minimum oil and gas filling pore diameter is determined; determining a key relaxation time point according to the minimum oil and gas filling aperture; and determining the oil saturation according to the key relaxation time point and the nuclear magnetic resonance logging T2 spectrum. According to the invention, the characterization accuracy of the oil saturation can be improved.
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