Prediction method for dynamic evolution of induced heterogeneity in shale reservoirs

Abstract

The invention discloses a shale reservoir induced heterogeneity dynamic evolution prediction method, which corrects the shale reservoir pore cross section from non-circular pores to circular pores; uses the pore equivalent diameter to quantitatively characterize the pore size evolution; calculates The apparent permeability of different sections of shale reservoirs; the apparent permeability of shale reservoirs is calculated by using the apparent permeability of different sections and the proportion of pores in different sections; based on Darcy's law of apparent permeability, the shale The material balance equation of the reservoir; by solving the material balance equation, the relationship between the apparent permeability of the shale reservoir at different positions in the matrix and the change with time is obtained, and the change relationship is used to quantitatively characterize the response and evolution of heterogeneity in the matrix to realize Prediction of dynamic evolution of induced heterogeneity in shale reservoirs. The invention can promote the development of the induced heterogeneity dynamic evaluation technology in the shale reservoir development process of pressure relief, and contribute to the understanding of the unsteady law in the shale reservoir development process.

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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