A method for identifying fluid properties of sand-shale rock based on bound water saturation model

By applying the technology of obtaining the J-type function of a single well through mercury intrusion porosimetry experiments, and combining it with well logging data, a fluid identification chart was established to identify oil and gas reservoirs. This resulted in a method for identifying the fluid properties of sandstone and conglomerate based on the bound water saturation model.

CN117368063BActive Publication Date: 2026-06-09CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2022-07-12
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately identify the fluid properties of sandstone and conglomerate in complex reservoirs, particularly oil-water identification, which is both challenging and lacks systematicity and accuracy.

Method used

Using a method based on the bound water saturation model, the J-type function of a single well is obtained through mercury intrusion porosimetry. Combined with well logging data and oil testing data, a bound water saturation calculation model is established, and a fluid identification chart is constructed to identify oil and gas layers, oil-water co-layers, and water layers.

Benefits of technology

It enables accurate identification of fluid properties in complex reservoirs, improving the accuracy and versatility of identification. It can clearly distinguish between oil and gas layers, oil-water co-layers, and water layers, and provides specific technical applications.

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Abstract

The application discloses a kind of sandy conglomerate fluid property identification method based on bound water saturation model, belong to complex lithology reservoir comprehensive evaluation technical field, solve the technical problem that although the existing technique comprehensive identification method can identify fluid property to some extent, but because reservoir structure is complex, strong heterogeneity, oil-water identification is difficult, lack of systematicness when evaluating.The method disclosed in the application obtains single well average J type function by laboratory mercury injection experiment, obtains bound water saturation S wi From function, corrected porosity physical value φ is established with bound water saturation S wi Fitting, obtain the bound water saturation model based on corrected porosity physical value, then recalculate water saturation, bound water saturation, then and well logging data establish fluid identification chart, with reliable theoretical basis, easy to operate and the like.
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