A lithofacies identification method based on hydrodynamics

By using a hydrodynamic-based lithofacies identification method, combined with median grain size and Froude number, the problem of insufficient microscopic permeability in lithofacies identification results in traditional methods has been solved. This method enables accurate identification and three-dimensional spatial characterization of lithofacies, supporting the efficient development of ultra-high water-cut reservoirs.

CN122148304APending Publication Date: 2026-06-05CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies fail to effectively reflect the origin of lithofacies in lithofacies identification, and their microscopic permeability is insufficient, making it difficult to accurately identify the distribution characteristics of residual oil in ultra-high water-cut reservoirs.

Method used

A hydrodynamic-based lithofacies identification method was adopted, which determined lithology by median grain size and sedimentary structures by Froude number, established lithofacies charts and identification criteria, and combined with closed core data and well logging data to achieve single-well lithofacies identification and three-dimensional spatial characterization.

Benefits of technology

It enables the reflection of lithofacies formation from a genetic perspective, improves the micro-permeability of lithofacies identification, and can accurately identify the formation and distribution characteristics of lithofacies, supporting the efficient development of ultra-high water-cut oil reservoirs.

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Abstract

The application discloses a lithofacies identification method based on hydrodynamics, and comprises the following steps: step 1, arranging coring well data; step 2, establishing a granularity median well logging interpretation mode, and determining lithology according to the granularity median; step 3, obtaining hydrodynamic parameters, and determining sedimentary structure according to the Froude number; step 4, establishing a lithofacies chart and identification standard; and step 5, identifying and dividing lithofacies in non-coring wells. The application is suitable for the technical field of oil development, and is based on the difference between granularity and sedimentary structure under different hydrodynamic conditions in a sedimentary period, forms a lithofacies identification method of determining lithology according to granularity and determining sedimentary structure according to the Froude number, and can reflect the formation of lithofacies from a cause, and embodies microscopic seepage performance of the lithofacies identification result.
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