Reservoir micro-capillary porosity determination method based on constant-pressure mercury injection experiment

Abstract

The invention provides a reservoir micro-capillary porosity determination method based on a constant-pressure mercury injection experiment. The method comprises the following steps: 1) sampling and measuring reservoir communication porosity; 2) carrying out a constant-pressure mercury injection experiment, and drawing a constant-pressure mercury injection curve; and 3) determining the maximum mercury injection saturation. Through a constant-pressure mercury injection experiment, the porosity of the reservoir microcapillary can be rapidly obtained, and the method has the advantages of being visual, clear, convenient, rapid, high in practicability and operability and the like. The defect that the existing experimental method cannot be used for independently and quantitatively determining theporosity of the micro capillary tube is effectively overcome. When the porosity of the reservoir microcapillary is determined by adopting a constant-pressure mercury injection experiment method, theeffective porosity of the reservoir is also determined, and the application of the constant-pressure mercury injection experiment is greatly expanded. The determination result of the micro-capillary porosity can be applied to pore structure research, reservoir quality evaluation, shale reservoir volume method reserve calculation and other aspects of various conventional or unconventional reservoirs, and has wide application prospects.

Description

technical field [0001] The invention relates to a method for determining the microcapillary porosity of a reservoir based on a constant-pressure mercury injection experiment, and belongs to the technical field of oilfield development geology. Background technique [0002] Reservoirs are rock formations capable of storing and percolating fluids, the basic properties of which are porosity and permeability. Reservoir porosity and permeability depend on porosity. Voids are spaces in rocks that are not filled by solid matter, and can be subdivided into larger pores and narrow connecting throats between larger pores. Pores determine the ability of the reservoir to store fluid, while throats control the ability of the reservoir to infiltrate fluid. The organic combination of the two forms the storage space for containing and infiltrating fluid. Therefore, the storage space of porous media reservoirs can be regarded as a three-dimensional pore-throat network composed of pores and ...

AI Technical Summary

Problems solved by technology

However, since the microcapillary pores of the reservoir do not have theoretical fluidity, it is still difficult to measure the microcapillary porosity of the reservoir separately in the laboratory at present, and there is also a lack of accurate physical quantitative calculation methods at home and abroad, which greatly limits the capacity of reservoirs. Quantitative Understanding and Application of Layer Microcapillary Porosity

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