Preparation method of coal rock combination physical model sample considering interlayer interface property

Abstract

The invention discloses a preparation method of a coal-rock combination physical model sample considering interlayer interface properties, belongs to the technical field of rock sample preparation, and can solve the problem that mechanical and physical properties of a rock stratum and an interlayer interface cannot be effectively reduced when a coal-gas composite reservoir coal-rock combination sample is prepared in the prior art. According to the method, the real large rock sample of the underground coal-gas composite reservoir is processed into the cuboid coal sample and each layer of cuboid rock sample, so that the physical and mechanical properties such as coal rock cleat and natural cracks of the real reservoir can be more accurately reduced, and the permeability of each layer of rock stratum of the coal-gas composite reservoir can be more truly reduced; meanwhile, the similar simulation degree of the coal rock combination sample obtained by manufacturing each rock stratum cuboid sample according to the proportion is high; the interlayer interface adhesive is prepared from a fresh coal sample and a shale sample of a coal-gas composite reservoir, so that the influence of physicochemical properties of similar materials and chemical adhesives used in the past on the interlayer interface permeability is avoided, and the interlayer interface properties are truly reduced.

Description

technical field [0001] The invention belongs to the technical field of rock sample preparation, and in particular relates to a method for preparing a coal-rock composite phantom sample in consideration of interlayer interface properties. Background technique [0002] Coal-measure natural gas, referred to as coal-measure gas, generally refers to various types of natural gas that occur in coal-measure formations, such as unconventional natural gas such as coalbed methane (CBM), coal-measure shale gas (TG), and tight sandstone gas (TSG). Mainly, there is a huge space for “increasing reserves and production” of coal-measure gas resources. The unique tectonic-sedimentary background of coal-measure gas makes the lithology of coal-measure gas reservoirs diverse, low porosity and low permeability. Composite reservoir formed by layers. From the perspective of reducing the cost of coal-measure gas mining, increasing the service life of coal-measure gas wells, and improving the recov...

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Problems solved by technology

[0009] The present invention aims at the inability to effectively restore the mechanical and physical properties of the rock layer and interlayer interface when preparing the coal-measure gas composite reservoir coal-rock combination sample in the prior art, and it is difficult to accurately measure the permeability of the composite coal-measure gas composite reservoir in the laboratory To solve the problem, a preparation method of coal-rock composite phantom samples is provided considering the interlayer interface properties. Natural coal rocks are used to prepare various rock layer specimens of coal-measure gas composite reservoirs, and natural coal rocks are used as raw materials to prepare interlayer samples. The interface adhesive combines the test pieces of each rock layer to obtain a coal-rock composite sample, which truly reflects the mechanical and physical properties of the coal-measure gas composite reservoir rock and the interlayer interface

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