A method for calculating water saturation of lacustrine carbonate rock based on mineral content

By combining a mineral content-based calculation method with the traditional Archie formula, the problem of underestimating water saturation in lacustrine carbonate reservoir calculations has been solved, achieving higher accuracy in reservoir evaluation and reserve calculation, which is applicable to the development of lacustrine carbonate oilfields.

CN122173729APending Publication Date: 2026-06-09SINOPEC OILFIELD SERVICE CORPORATION +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SINOPEC OILFIELD SERVICE CORPORATION
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately calculate the water saturation of lacustrine carbonate reservoirs, especially due to the presence of high-resistivity minerals, which leads to lower calculation results and affects oilfield reserve evaluation and development plan design.

Method used

The method for calculating water saturation of lacustrine carbonate rocks based on mineral content obtains formation water resistivity, core water saturation, porosity, and high-resistivity mineral content. It then uses regression methods to determine coefficients k, z, m, and n, and combines this with the traditional Archie formula to calculate the water saturation of the well to be evaluated.

Benefits of technology

It improves the accuracy and precision of water saturation calculation in lacustrine carbonate reservoirs, provides more reliable reservoir evaluation parameters, has a wide range of applications, low cost, and is easy to operate.

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Abstract

The present application belongs to the field of well logging, and discloses a kind of lake facies carbonate rock water saturation calculation method based on mineral content, solve the technical problem that the water saturation calculated by the prior art is lower than the actual water saturation of core, comprising: 1) obtaining the formation water resistivity Rw of the working area;2) obtaining the core water saturation Sw1 of the known well in the working area and the formation resistivity Rt1, reservoir porosity φ1 and high resistance mineral content V1 corresponding to the depth;3) according to the data obtained in steps 1) and 2), the coefficients k, z, m and n are obtained by regression method using the calculation formula;4) obtaining the formation resistivity Rt, reservoir porosity φ and high resistance mineral content V of the well to be evaluated in the working area;5) calculating the water saturation Sw of the well to be evaluated according to the calculation formula;6) output the calculation result. The present application is easy to obtain data, simple to operate and has high calculation accuracy.
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