Multi-series conventional logging response analysis method based on shaft crack space continuation

By analyzing and adjusting the core depth, combining the fracture characteristic parameters identified by the imaging picture, the crack space distribution within different series of radial detection depths of conventional well logs is solved, and the problem of inaccurate conventional well logging values ​​in the existing technology is achieved, and crack recognition and three-dimensional feature portrayal is achieved with higher accuracy.

CN119712087AActive Publication Date: 2025-03-28CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202411876347.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

The existing conventional logging crack identification methods fail to fully consider the different radial and longitudinal detection ranges of conventional logging series, as well as the spatial distribution of fractures from the wellbore to the conventional logging detection range, resulting in inaccurate conventional logging values ​​for obtaining fracture responses.

Method used

By collecting and analyzing logging data, core photos and imaging pictures of a single well, combining the characteristics of the core ground scanning gamma curve with the imaging log gamma curve, the core depth is adjusted to unify it with the imaging logging trend. Then, the crack characteristic parameters identified by the imaging pictures are used to analyze the spatial distribution of the fractures within the radial detection depths of the conventional well logging series, calculate the total spatial distribution volume of the fractures at different depth points, and extract the average value and amplitude difference of different series of conventional well loggings in combination with longitudinal resolution to seek the response relationship.

Benefits of technology

The accuracy of obtaining conventional logging values ​​at the cracks is improved, and the complexity and fine characteristics of the cracks are fully portrayed, laying the foundation for subsequent conventional logging curve identification and mapping of three-dimensional distribution characteristics.

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Abstract

The invention discloses a multi-series conventional logging response analysis method based on shaft crack space continuation. The method comprises the following steps: (S100) collecting data and images; (S200) carrying out characteristic comparison on the ground scanning gamma curve of the rock core and the gamma curve obtained by imaging logging to finish accurate homing of the depth of the rock core; establishing a work area imaging picture crack characteristic mode, utilizing the work area imaging picture crack characteristic mode to accurately pick up the natural crack of the imaging picture, and obtaining the crack middle depth, the shaft extension top and bottom depth, the inclination angle, the inclination, the opening degree and the crossing performance parameters; (S300) carrying out crack epitaxy analysis; and (S400) data extraction and response analysis. The method solves the problem that the conventional logging numerical value of the crack response is not accurate due to the fact that the different radial and longitudinal detection ranges of different series of conventional logging and the spatial distribution condition of the crack extending from the shaft to the conventional logging detection range are not considered in the existing method.
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