Shale gas reservoir reserve solution method considering multiple factors

Abstract

The invention discloses a shale gas reservoir reserve solution method considering multiple factors. The method comprises the following steps: testing and collecting basic parameters and historical production data of a shale gas reservoir; establishing a substance balance equation by considering factors such as free gas of the matrix and cracks, adsorption phase apparent porosity, adsorption phasedensity, dissolved gas in kerogen, corrected rock compression coefficient, adsorption gas critical desorption pressure and shrinkage effect of adsorption gas desorption on the matrix, and obtaining ashale gas reservoir total reserve expression; according to the established material balance equation, processing basic parameters and production data of the material balance equation, and drawing related curves; and finally calculating the total reserve V of the shale gas reservoir. According to the method, the matrix, crack free gas, adsorption phase porosity, dissolved gas diffusion, adsorptiongas critical desorption pressure and the shrinkage effect of adsorption gas desorption on the matrix are comprehensively considered, a new shale gas reservoir substance balance equation is established, and the equation has important guiding significance for reasonably calculating shale gas reservoir dynamic reserves.

Description

technical field [0001] The invention belongs to the field of calculation of dynamic reserves of shale gas reservoirs in the process of oil and gas field development, and specifically relates to a method for calculating reserves of shale gas reservoirs in consideration of various factors, and provides effective guidance in the process of calculating reserves. Background technique [0002] Shale gas is mainly stored in high-carbon mud shale or dark mudstone in the form of free gas, adsorbed gas and dissolved gas. Free gas is mainly distributed in matrix pores and fracture pores; adsorbed gas is mainly distributed on the inner surface of micropores in the matrix system; dissolved gas is relatively small, and is mainly distributed in asphaltenes and a small amount of shale oil. Generally, there are three methods for calculating shale gas reserves: analogy method, volumetric method and material balance method. In the process of shale gas exploration and development, reserve eval...

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Problems solved by technology

Jiang Ruizhong et al. derived the calculation formula of shale gas reserves from the molecular point of view, but only considered the adsorption phase reserves composed of a single methane molecule

The material balance method is often used to calculate the producing geological reserves of shale gas reservoirs, which requires a large amount of production data. When many scholars use the material balance equation to calculate the reserves of shale gas reservoirs, they do not take the dissolved gas dissolved in the kerogen into account. lead to inaccurate calculation results

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