Method and device for measuring rock gas adsorption phase volume

Abstract

The embodiment of the invention discloses a method and a device for measuring rock gas adsorption-phase volume. The method comprises the following steps: when a target gas is injected in a measurement chamber of target rock and the pressure value of the target gas is each first preset pressure value in a first pressure value set, obtaining first mass of the measurement chamber under the first preset pressure value; calculating excess adsorption mass of the target gas under the first preset pressure value according to a preset function relationship, the mass and volume of the measurement chamber, the mass and volume of the target rock and the first mass of the measurement chamber, wherein the preset function relationship is a function relationship among the excess adsorption mass, absolute adsorption mass and adsorption-phase volume; determining the adsorption-phase volume of the target gas relative to the target rock based on the excess adsorption mass corresponding to each first preset pressure value in the first pressure value set. According to the method and the device, disclosed by the embodiment of the invention, higher applicability and higher accuracy are obtained.

Description

technical field [0001] The present application relates to the technical field of geophysical exploration, in particular to a method and device for measuring the volume of rock gas adsorption phase. Background technique [0002] The gas in the rock mainly occurs in the nano-scale pores and micro-cracks in the free state, and in the organic matter and clay mineral pore surface in the adsorbed state. Geological reserves are the key parameters in the economic evaluation of gas reservoirs, which are usually the sum of free gas content and adsorbed gas content. The free gas content is mainly affected by factors such as porosity, formation temperature, pressure, and gas saturation, and the calculation is relatively simple. The content of adsorbed gas is mainly affected by factors such as the interaction between gas and matrix, the properties of fluid, and formation temperature and pressure, and its accurate evaluation is complicated. Therefore, accurate measurement of adsorbed ga...

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Problems solved by technology

[0004] At present, the research on the volume of the adsorption phase at home and abroad is still in the stage of theoretical assumptions and mathematical optimization.

In an article titled "Shale gas-in-place calculations Part I: New pore-scale considerations" in "SPE Journal" Volume 17, Issue 1 in March 2012, Ambrose et al. proposed that when calculating shale gas geological reserves The volume occupied by the adsorbed phase should be considered, but no experimental test method for the adsorbed phase volume is given

At present, there is no practical method that can accurately measure the volume of rock gas adsorption phase

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