Shale reservoir induced heterogeneity dynamic evolution prediction method

Abstract

The invention discloses a shale reservoir induced heterogeneity dynamic evolution prediction method. The method comprises the following steps: correcting a pore with a non-circular cross section of ashale reservoir into a circular pore; carrying out quantitative characterization on pore size evolution by utilizing the pore equivalent diameter; calculating apparent permeability of different sections of the shale reservoir; calculating the apparent permeability of the shale reservoir by utilizing the apparent permeability of different sections and the pore proportions of different sections; obtaining a material balance equation of the shale reservoir based on the Darcy law of the apparent permeability; and solving the material balance equation to obtain the change relationship of the apparent permeability of the shale reservoir at different positions in the matrix along with time, and quantitatively characterizing the heterogeneous response and evolution in the matrix by utilizing the change relationship to realize the prediction of the induced heterogeneous dynamic evolution of the shale reservoir. According to the method, the development of the induced heterogeneity dynamic evaluation technology in the shale reservoir pressure relief development process can be promoted, and the understanding of the unsteady-state law in the shale reservoir development process is facilitated.

Description

technical field [0001] The technical field of the present invention is the field of quantitative characterization of induced heterogeneity of shale reservoirs in unconventional oil and gas development, and specifically relates to a dynamic evolution prediction method of induced heterogeneity of shale reservoirs. Background technique [0002] As a new type of unconventional natural gas resource, shale gas is attracting increasing attention and attention due to its characteristics of cleanliness, high efficiency, and large resources. At the same time, shale gas can help improve my country's energy consumption structure and increase chips for national energy security. With the large-scale development of shale oil and gas resources, research on various basic theories and related technologies for shale reservoir development has become the focus and hot spot. Among them, the shale matrix is ​​the main storage space of shale gas and the material supply source of the fracture networ...

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Problems solved by technology

[0004] At present, the relevant theories for shale reservoir development mainly focus on borrowing static models from related disciplines or improving related static models to balance the characteristics of adsorption / desorption, micro-nano scale migration, and stress sensitivity involved in the shale gas development process. There are relatively few related technologies or methods for quantitative evaluation of the heterogeneity induced by the complex unsteady mechanical behavior in the dynamic development process of shale reservoirs. At the same time, different mechanisms (adsorption / desorption There are relatively few techniques or methods for quantitative evaluation of heterogeneity evolution under synergistic induction of micro-nano scale migration and stress sensitivity

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