Method and system for determining formation parameters of vertical well shale gas reservoir

Abstract

The embodiment of the invention provides a method and system for determining formation parameters of a vertical well shale gas reservoir. The method comprises: setting initial formation parameters; obtaining bottom-hole pressure according to the initial formation parameters through analog computation; drawing theoretical curves of the bottom-hole pressure, pressure drop and pressure derivatives; fitting the theoretical curves with corresponding actually measured curves to obtain fitting results; if the fitting results meet a pre-set precision requirement, determining the initial formation parameters to be actual formation parameters; if the fitting results do not meet the pre-set precision requirement, correcting the initial formation parameters according to a quasi-radial flow and a quasi-linear flow until the fitting results meet the pre-set precision requirement; determining corrected initial formation parameters to be the actual formation parameters. According to the method and the system, provided by the invention, the formation parameters are determined according to the quasi-radial flow and the quasi-linear flow, so that the technical problem of a non-steady state well testing method that the determination speed is slow is solved, and the aim of rapidly and accurately determining the formation parameters of the vertical well shale gas reservoir is realized.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a method and system for determining formation parameters of vertical well shale gas reservoirs. Background technique [0002] In actual oil and gas reservoir development, shale gas reservoirs generally refer to gas reservoirs with complex geological storage conditions and difficult exploitation. In the specific oil and gas exploration process, it is of great significance to accurately describe the relevant conditions of shale gas reservoirs in actual production, and the geological parameters of shale gas reservoirs are an important data used to describe the relevant conditions of shale gas reservoirs. Among them, due to the characteristics of the vertical well itself, the geological parameters of the vertical well shale gas reservoir generally include: formation adsorption parameters (such as gas adsorption pressure and gas adsorption capacity, etc.), fo...

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Problems solved by technology

[0004] However, in actual implementation, because the unsteady-state well testing method needs to determine the radial flow, therefore, the unsteady-state well-testing method is used to determine the formation parameters of shale gas reservoirs, which often has the problems of cumbersome determination process and slow determination speed

[0005] For the above problems, no effective solutions have been proposed so far

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