Method for comprehensively representing occurrence lower limit critical conditions of deep marine carbonate reservoir

Abstract

The invention belongs to the technical field of oil and gas detection, particularly relates to a method, a system and equipment for comprehensively representing the occurrence lower limit critical condition of a deep marine carbonate reservoir, and aims to solve a problem that a deep effective reservoir is difficult to predict and identify due to the fact that the occurrence lower limit critical condition of the deep marine carbonate reservoir cannot be accurately determined in the prior art. The method comprises steps of the reservoir occurrence lower limit critical porosity and permeability value being determined based on a boundary; determining the reservoir occurrence lower limit critical porosity and permeability value based on the core sample movable oil ratio; determining an oil reservoir occurrence lower limit critical pore throat radius based on a mercury injection experiment; and finally, comprehensively representing the occurrence lower limit critical condition of the deep marine carbonate reservoir. According to the method, a problem that the occurrence lower limit critical condition of the deep marine carbonate reservoir cannot be accurately determined in the prior art is solved, and deep effective reservoirs can be predicted and identified.

Description

technical field [0001] The invention belongs to the technical field of oil and gas detection, and in particular relates to a method, system and equipment for comprehensively characterizing the occurrence lower critical condition of deep marine carbonate reservoirs. Background technique [0002] The lower limit of reservoir occurrence refers to the critical condition corresponding to the loss of free fluid space for oil and gas-bearing basin reservoirs and the end of oil accumulation, which can generally be expressed comprehensively by porosity, permeability or pore throat radius. Above this critical condition, geological conditions are conducive to the formation and distribution of oil reservoirs and oil exploration; below this critical condition, geological conditions are not conducive to the formation and distribution of oil reservoirs, and the risk of oil exploration is high. At present, it is increasingly difficult to find new oil and gas reserves in the shallower than 4...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing technology cannot accurately determine the lower limit critical condition of deep marine carbonate reservoirs, resulting in difficulties in predicting and identifying deep effective reservoirs, the present invention proposes A method for comprehensively characterizing the lower critical condition of deep marine carbonate reservoirs, which is used to comprehensively characterize the lower critical conditions of deep marine carbonate reservoirs, and then predict deep marine carbonate oil The lower limit of storage, the method includes:

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