Novel method for calculating saturation index of tight oil-gas reservoir

Abstract

The invention relates to a tight reservoir saturation index calculation method, which is an accurate and effective means for evaluating the electrical characteristic parameters of a tight reservoir. The method comprises steps: (1) a core is prepared to be cut into three sections A, B, and C, the A section is used for wettability analysis, the B section is used for cast flake analysis and the C section is used for a centrifugal nuclear magnetic resonance experiment; (2) reservoir rock wettability analysis is carried out; (3) reservoir rock microstructure analysis is carried out to determine a shape factor G; (4) a sample centrifugal nuclear magnetic resonance experiment is conducted to acquire a nuclear magnetic resonance T2 spectrum in the centrifugal process; and (5) a saturation index nis calculated. In combination of the rock microstructure, the wettability analysis and the nuclear magnetic resonance T2 spectrum in the centrifugal process, the saturation index n under a different water saturation condition of the tight reservoir can be accurately calculated and obtained, and a foundation is laid for accurate quantitative evaluation of the water saturation of the reservoir during the tight oil-gas reservoir exploration and development processes.

Description

technical field [0001] The invention relates to a method for calculating the reservoir saturation index n, especially for the calculation of the reservoir saturation index of tight oil and gas reservoirs. Mainly combined with centrifuge nuclear magnetic resonance experiments in the state of rock saturated with water, as well as casting thin section and wettability analysis, it can accurately and quantitatively calculate the saturation index n used in the calculation of water saturation in tight oil and gas reservoirs, which is an accurate and feasible method. Evaluation method for reservoir characteristic parameters of tight oil and gas reservoirs. Background technique [0002] With the increasing global energy demand and the gradual depletion of conventional resources, unconventional oil and gas reservoirs represented by tight oil and gas have attracted more and more attention. Different from conventional oil and gas reservoirs, tight oil and gas reservoirs mainly develop ...

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Problems solved by technology

Although a lot of research has been done on the calculation method of reservoir saturation evaluation index n at home a

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