A method and system for evaluating reservoirs for effective stimulation volume

By combining multi-source parameters of microseismic events with fracturing construction design, multi-scale fracture characteristic classification was carried out, which solved the problem of large discrepancies between actual and theoretical designs in reservoir stimulation volume assessment, and achieved more accurate reservoir stimulation volume assessment, supporting shale gas development.

CN122307683APending Publication Date: 2026-06-30CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2024-12-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for assessing reservoir stimulation volume have significant discrepancies with theoretical design and actual engineering response. Conventional methods cannot accurately characterize the spatial extent of reservoir stimulation, leading to calculation results that are either too large or too small.

Method used

By collecting three-dimensional stratigraphic data and well logging data of the reservoir stimulation target area, microseismic observation of fracture spatial layout is carried out. Combined with multi-scale fracture characteristics, quantitative division is performed to divide large and small-scale natural and artificial fracture network areas. The effective stimulation volume of the reservoir is calculated by superimposing data. The comprehensive evaluation is carried out by using microseismic multi-source parameters and fracturing construction design, combined with geological stratigraphic information.

Benefits of technology

This improves the accuracy and repeatability of reservoir stimulation volume assessment, providing an important reference for shale gas development and ensuring the rationality and accuracy of fracturing section selection and construction parameter design.

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Abstract

This invention provides a method and system for evaluating the effective stimulation volume of a reservoir. The method includes: collecting and preprocessing three-dimensional stratigraphic data and well logging data of the target reservoir stimulation area to establish a three-dimensional spatial region Space3D(x,y,z); performing microseismic observation to spatially map fracture ruptures; quantitatively classifying multi-scale fracture rupture characteristics; dividing large-scale natural fracture rupture areas; dividing small-scale artificial fracture network rupture areas; and superimposing the stimulation volumes of the quantitatively divided, large-scale natural fracture rupture areas, and small-scale artificial fracture network rupture areas to calculate the effective stimulation volume of the reservoir. The system can implement the method. The advantage of this invention is that it avoids the technical defect of conventional reservoir stimulation volumes having large discrepancies between theoretical design and actual engineering response, and better characterizes the spatial range of reservoir stimulation.
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