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<p>As an important area for shale gas development in China, the southern Sichuan region has complex geological conditions in its deep shale gas reservoirs (buried at depths of 3500-4500 m), and frequent accidents such as well leakage, blowout, and collapse occur during drilling, seriously restricting development efficiency. This article proposes a drilling geological risk prediction method based on well seismic integration for complex deep formations in southern Sichuan. The aim is to accurately identify geological risks by comprehensively characterizing lithology, fractures, and rock mechanics characteristics, and provide technical guidance for drilling construction. The study takes a shale gas block (R block) in southern Sichuan as a case area, and combines logging, logging, and seismic data to systematically analyze the geological characteristics and potential risks of each formation using techniques such as lithology logging matching analysis, ant tracking fracture prediction, and rock mechanics parameter calculation. The results indicate that the Shaximiao Formation to Xujiahe Formation in Block R are mainly composed of mudstone, which is prone to well collapse; The Leikoupo Formation and Jialingjiang Formation are at risk of being difficult to drill due to the development of limestone and gypsum layers; Cracks are concentrated in the Leikoupo Formation to Maokou Formation, which can easily cause well leakage; There is a significant difference in fracture pressure between the Longmaxi Formation and the Baota Formation, and areas with large horizontal stress differences are prone to drilling leakage. Based on the above analysis, a comprehensive prediction template for drilling geological risks has been established, clarifying the risk types and distribution patterns of each formation. The integrated well seismic prediction method proposed in this article achieves multi-dimensional comprehensive evaluation of geological risks, providing theoretical basis and technical support for the safe and efficient development.</p>

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Research on Geological Risk Prediction of Drilling in Deep Complex Strata

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Chenghua Ou,
  • Minghao Chen,
  • Shixuan Peng,
  • Furun Xiao,
  • Peipei Guo

摘要

As an important area for shale gas development in China, the southern Sichuan region has complex geological conditions in its deep shale gas reservoirs (buried at depths of 3500-4500 m), and frequent accidents such as well leakage, blowout, and collapse occur during drilling, seriously restricting development efficiency. This article proposes a drilling geological risk prediction method based on well seismic integration for complex deep formations in southern Sichuan. The aim is to accurately identify geological risks by comprehensively characterizing lithology, fractures, and rock mechanics characteristics, and provide technical guidance for drilling construction. The study takes a shale gas block (R block) in southern Sichuan as a case area, and combines logging, logging, and seismic data to systematically analyze the geological characteristics and potential risks of each formation using techniques such as lithology logging matching analysis, ant tracking fracture prediction, and rock mechanics parameter calculation. The results indicate that the Shaximiao Formation to Xujiahe Formation in Block R are mainly composed of mudstone, which is prone to well collapse; The Leikoupo Formation and Jialingjiang Formation are at risk of being difficult to drill due to the development of limestone and gypsum layers; Cracks are concentrated in the Leikoupo Formation to Maokou Formation, which can easily cause well leakage; There is a significant difference in fracture pressure between the Longmaxi Formation and the Baota Formation, and areas with large horizontal stress differences are prone to drilling leakage. Based on the above analysis, a comprehensive prediction template for drilling geological risks has been established, clarifying the risk types and distribution patterns of each formation. The integrated well seismic prediction method proposed in this article achieves multi-dimensional comprehensive evaluation of geological risks, providing theoretical basis and technical support for the safe and efficient development.