A method for well leakage early warning by using earthquake prediction results

By performing anisotropic diffusion and three-dimensional multi-level median filtering on seismic data, combined with pre-stack multi-directional frequency attenuation gradient and structural coherence tensor, a high-precision well leakage early warning system was achieved, solving the problem of insufficient well leakage early warning accuracy in existing technologies and guiding well location and drilling design.

CN120447053BActive Publication Date: 2025-11-18SOUTHWEST PETROLEUM UNIV
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Patent Information

Application Number
CN202510750602.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-06
Publication Date
2025-11-18
Estimated Expiration
2045-06-06

AI Technical Summary

Technical Problem

Existing well leakage early warning technologies are hampered by the poor quality of seismic data and the lack of anisotropic characteristics in post-stack data, making it difficult to achieve high-precision characterization of small fractures and cavities. Furthermore, they do not involve seismic data preprocessing, resulting in insufficient well leakage early warning capabilities.

Method used

Anisotropic diffusion and three-dimensional multi-level median joint filtering techniques were used to process post-stack depth domain seismic data. Multi-attribute fusion was performed by combining pre-stack multi-directional frequency attenuation gradients and post-stack structural coherence tensors. The spatial morphology of small fractures and cavities was displayed using shadow relief techniques.

Benefits of technology

It improves the accuracy of well leakage early warning, enabling more precise characterization of small fractures and cavities, guiding well location design and drilling trajectory optimization, and reducing the risk of well leakage.

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Abstract

The present application relates to the field of geophysical exploration technology, and particularly relates to a method for well leakage early warning by using seismic prediction results, comprising: basic data acquisition, regional geological condition analysis, seismic data preprocessing, small fracture and fracture-vug body seismic fine delineation, and shadow relief display of the delineation result. The present application improves the basic data quality by introducing anisotropic diffusion and three-dimensional multi-level median joint filtering technology, and carries out multi-attribute fusion based on adjustable parameters by combining pre-stack multi-azimuth frequency attenuation gradient fracture prediction and post-stack structural coherent tensor, finally realizes spatial display of the multi-attribute fusion result by using shadow relief technology, improves the accuracy of small fracture and fracture-vug body delineation, and more directly shows the spatial form of the fracture and fracture-vug body, which can effectively guide well location design, drilling design and drilling trajectory optimization.
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