A method for optimizing well locations for subsalt carbonate structural-lithologic gas reservoirs

By comprehensively utilizing drilling, logging, well logging and seismic data, combined with paleo-structural maps and formation thickness maps, the comprehensive evaluation index of gas content is calculated and well location deployment is optimized, thus solving the problem of well location identification in sub-salt carbonate structural-lithologic gas reservoirs and improving the success rate of drilling and gas testing.

CN118837957BActive Publication Date: 2025-09-19PETROCHINA CO LTD
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Patent Information

Application Number
CN202310439095.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-23
Publication Date
2025-09-19
Estimated Expiration
2043-04-23

AI Technical Summary

Technical Problem

The well location optimization method for subsalt carbonate structural-lithologic gas reservoirs is difficult to effectively identify reservoirs, resulting in low drilling success rates and gas testing success rates. Existing technologies cannot effectively address the influence of the heterogeneity, fault system and associated salt structures of subsalt carbonate reservoirs.

Method used

By comprehensively utilizing drilling, logging, well logging and seismic data, intuitive evaluation indicators are established. Combined with paleo-structural maps and stratigraphic thickness maps, a comprehensive evaluation index of gas content is calculated to screen out favorable well location deployment areas, including parameters such as paleo-structural highs, structural uplifts, salt rock caprock thickness and fault distribution, to optimize well location deployment.

Benefits of technology

The drilling success rate and gas testing success rate of pre-salt carbonate structural-lithologic gas reservoirs have been improved, ensuring the effectiveness of well deployment and the acquisition of industrial gas flow.

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Abstract

The present invention provides a method for optimizing well locations in sub-salt carbonate tectonic-lithologic gas reservoirs. This method establishes evaluation indicators using intuitive presentation. Based on drilling data and seismic data, and on the factors controlling natural gas enrichment in sub-salt tectonic-lithologic carbonate gas reservoirs determined through comprehensive research, this method compiles industrial maps based on paleo-tectonic maps, present-tectonic maps, and stratigraphic thickness maps, and determines relevant parameters for deploying drilling points. Finally, a comprehensive gas-bearing evaluation index is derived through mathematical statistics and combined calculations. The known industrial gas flow with the highest yield is used as the maximum benchmark parameter, and the known low-yield wells are used as the minimum benchmark parameter. Index intervals are used to screen for favorable well locations. A comprehensive gas-bearing evaluation index S greater than 1 indicates good gas-bearing potential, effectively improving the success rate of drilling to achieve industrial production.
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