Method and device for acquiring reservoir capillary pressure curve

Abstract

The embodiment of the invention provides a method and device for obtaining a reservoir capillary pressure curve. The method comprises the following steps: acquiring nuclear magnetic resonance T2 distribution and capillary pressure curves of a plurality of rock core samples of a target reservoir, wherein the capillary pressure curve is a relation curve of non-wet phase saturation changing along with capillary pressure; establishing a nonlinear conversion relational expression of the nuclear magnetic resonance T2 distribution conversion capillary pressure curve, wherein the relational expressioncomprises a plurality of unknown coefficients; substituting the T2 value of the nuclear magnetic resonance T2 distribution of each rock core sample and the actual measurement value of the capillary pressure into the conversion relational expression, and solving the solutions of the plurality of unknown coefficients according to a preset algorithm, wherein the actual measurement value of the capillary pressure is the capillary pressure value of the capillary pressure curve; substituting the nuclear magnetic resonance T2 distribution of the target reservoir and the solutions of the plurality ofunknown coefficients into the conversion relational expression, and calculating to obtain a capillary pressure curve of the target reservoir, thereby improving the prediction precision of the capillary pressure curve of the reservoir.

Description

technical field [0001] The embodiments of this specification relate to the technical field of oil and gas field exploration and development, and in particular to a method and device for obtaining capillary pressure curves of reservoirs. Background technique [0002] The analysis of reservoir pore structure is of great significance to the characterization and prediction of reservoir properties. The capillary pressure curve can be used to characterize the pore throat size and distribution of the reservoir rock. By analyzing the shape of the capillary pressure curve and calculating the parameters of the capillary pressure curve, the pore structure of the reservoir rock can be evaluated, the seepage capacity of the reservoir can be estimated, and the oil-water saturation can be calculated. degree, permeability, etc. [0003] The measurement of the capillary pressure curve is to analyze the general attributes of the rock sample on the basis of a large number of original measurem...

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Problems solved by technology

However, in actual production, the number of coring is limited, the cost is high, and the high-pressure mercury injection experiment will destroy the core. The above factors limit the number of capillary pressure curves obtained to a certain extent, making the prediction accuracy of the capillary pressure curve of the reservoir lower. high

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