Method of evaluating effective stimulated reservoir volume of shale gas reservoir

Abstract

The invention discloses a method of evaluating an effective stimulated reservoir volume of a shale gas reservoir. The method comprises steps: S1, fractal permeability and fractal porosity are introduced to a fractured vertical well stimulated reservoir volume area and power law relationships are shown with a fractal dimension d and a fractal index theta; S2, shale gas adsorption and diffusion characteristics are introduced, according to the above power law relationships, a dual-porosity single-permeability model is adopted, an effective stimulated reservoir volume analysis and evaluation modelis deduced, and shale gas reservoir fractured vertical well bottom dimensionless pseudopressure and a derivative type curve thereof are obtained; S3, according to the curve, the stimulated reservoirvolume is calculated for the homogeneous stimulated reservoir volume fractured vertical well; S4, according to the fractured vertical well bottom dimensionless pseudopressure derivative type curve, the stimulated reservoir volume is calculated for the non-homogeneous stimulated reservoir volume fractured vertical well; and S5, according to mine field data, the effective stimulated reservoir volumeis calculated, and the relationship between the effective stimulated reservoir volume and the stimulated reservoir volume is evaluated. The method of the invention can reflect the reservoir heterogeneity in a fracturing area, and the convenience and the accuracy of application are enhanced.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas resource development, and relates to a data evaluation method for effective stimulation volume, in particular to an evaluation method for effective stimulation volume of shale gas reservoirs. Background technique [0002] When shale is exploited in the field of unconventional oil and gas resource development, the effective stimulated reservoir volume (ESRV) is the key factor affecting the production performance and development effect of fracturing vertical wells during the fracturing development process of shale reservoirs. Using microseismic technology and fracturing parameter estimation methods to estimate ESRV has disadvantages such as complex operation and many parameters required, resulting in low accuracy of ESRV estimation results, which limits the convenience and reliability of the application of such methods. The shortcomings of the existing ESRV evaluation methods are as follows...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for evaluating the volume of effective stimulation of shale gas reservoirs. This method solves the problem that the evaluation results of the existing methods cannot describe the non-uniformity of the reservoir in the fracturing stimulation area and the problem of long operation period, and can target the physical properties of the reservoir. Calculation of the stimulated volume size based on the distribution, reflecting the heterogeneity of the reservoir in the fracturing area, and enhancing the convenience and accuracy of the application

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