A method for comprehensively characterizing the lower critical condition of deep marine carbonate reservoirs

Abstract

The invention belongs to the technical field of oil and gas detection, and specifically relates to a method, system and equipment for comprehensively characterizing the lower limit critical condition of deep marine carbonate reservoirs, aiming to solve the problem that existing technologies cannot accurately determine deep marine carbonate The lower critical condition of rock reservoir occurrence leads to the difficulty of predicting and identifying deep effective reservoirs. The method of the present invention includes: determining the lower critical porosity and permeability values ​​of the reservoir occurrence based on the dividing line; determining the lower critical porosity and permeability values ​​of the reservoir occurrence based on the movable oil ratio of the core sample; determining the reservoir occurrence based on the mercury injection experiment The lower critical pore-throat radius of occurrence; finally, comprehensively characterize the lower critical condition of occurrence of deep marine carbonate reservoirs. The invention overcomes the problem that the prior art cannot accurately determine the critical condition of the lower limit of occurrence of deep marine carbonate reservoirs, and is helpful for predicting and identifying effective deep reservoirs.

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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