A shale gas reservoir solid-gas effect annulus identification system and its application

Abstract

The invention provides a shale gas reservoir solid-gas effect annulus identification system, including: adsorption gas amount prediction subsystem: through the prediction of the shale adsorption gas amount of the target layer shale sample under the formation temperature and pressure conditions, the target layer page is established The variation curve of the amount of gas adsorbed by rock samples with the burial depth; the solid-gas effect simulation subsystem: used to establish the variation curve of the diffusion coefficient and permeability of the target layer shale with the burial depth through simulation experiments; the solid-gas effect ring identification subsystem: based on the adsorption The variation curve of the adsorbed gas volume with the burial depth obtained by the gas volume prediction subsystem, and the variation curve of the diffusion coefficient and permeability with the burial depth established by the solid-gas effect simulation subsystem, and then establish the solid-gas effect zone identification chart, and further determine the solid-gas effect zone. The location of the belt. The identification system provided by the invention provides a new analysis method for the determination of the loss of residual structural shale gas, the determination of the boundary of preservation and enrichment, and the study of accumulation models.

Description

technical field [0001] The invention belongs to the field of geology, and relates to a shale gas reservoir solid-gas effect annulus recognition system and an application thereof. Background technique [0002] Shale gas is an important unconventional resource. The successful exploration and development of large shale gas fields such as Jiaoshiba demonstrates the good prospect of industrial application of shale gas. Evaluation of shale gas preservation conditions and accumulation models is an important topic in the field of shale gas exploration and development. Exploration practice has proved that the Wufeng-Longmaxi Formation shale in the area east of the Qiyueshan fault is an important area for shale gas exploration and development, with obvious advantages in exploration area and resources, but compared with the Jiaoshiba area, it is subject to structural transformation. Due to the characteristics of strong action, early formation uplift time, large uplift range and strong...

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Problems solved by technology

[0003] Some scholars have suggested that the distance from Wufeng-Longmaxi Formation shale outcrops affects the preservation of shale gas, and lateral diffusion is the main loss channel for shale gas, but how far away from the outcrop area is a weak diffusion area is still a complicated issue

Although the researchers explained it from different aspects, since the amount of gas adsorbed in shale can reach 20%-80%, the adsorption and accumulation of shale gas is an important accumulation mechanism. Research on Tibetan influence needs to be deepened

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