四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩气地质工程一体化高产井培育实践与勘探突破

doi:10.3969/j.issn.1672-7703.2024.03.006

摘要/Abstract

摘要： 四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩储层地层时代老、埋藏深度大、热演化程度高，勘探开发难度大，国内外尚无可直接借鉴的经验。为此，基于地质工程一体化理念，探索建立筇竹寺组“部—钻—压—采”一体化高产井培育关键技术体系：（1）一体化井位部署，深化筇竹寺组“裂陷槽控藏”认识，明确优质储层分布模式，明确高产井实施技术界限，支撑井位优化部署；（2）一体化钻录定导，基于地质工程参数综合评价，优中选优确定靶体，优化井轨迹，强化地质钻井一体化精细管理，保障优质储层钻遇率；（3）一体化压裂增产，基于一体化压裂模型优化压裂设计，形成“促复杂+扩体积+强支撑+防套变”压裂工艺，有效实现裂缝均匀开启、高效扩展、全域支撑及储层改造体积最大化；（4）一体化精细返排，形成“四因子”返排增产技术，结合精细排采分析平台，实现降低储层伤害与气井增产“双突破”。基于上述技术体系，资201井首次在国内寒武系4500m以深的页岩储层测试获得高产工业气流，威页1H井成功实现高产井复制，初步落实埋深5000m以浅有利区面积近3000km²，资源量近2×10¹²m³。所形成的高产井培育技术和方法，为破解寒武系超深层页岩气规模效益开发难题奠定了坚实基础。

关键词: 四川盆地, 寒武系, 筇竹寺组, 超深层页岩气, 地质工程一体化, 高产井培育

Abstract: The ultra-deep shale gas reservoir in the Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen in Sichuan Basin is characterized by old geologic age, large burial depth and high thermal evolution, leading to great difficulty in shale gas exploration and development. However, there is no direct experience to learn from both at home and abroad. In view of this, the idea of geology and engineering integration is applied to preliminarily establish the key technological system of “well deployment-drilling-fracturing-production” for cultivating high-yield wells of Qiongzhusi Formation shale gas: (1) Integrated well deployment. The understanding of “hydrocarbon accumulation controlled by aulacogen” is deepened, the distribution mode of high-quality reservoir is determined, and the technical limits for operating high-yield wells are clarified, supporting the optimization of well deployment. (2) Integrated drilling, logging, and geosteering. Based on the comprehensive evaluation of geological and engineering parameters, the optimum drilling target is selected, the well trajectory is optimized, and the geology and drilling integrated fine management is strengthened, which effectively guarantee the drilling rate of high-quality reservoir. (3) Integrated fracturing and reservoir stimulation. The integrated fracturing model is used to optimize fracturing design, forming fracturing technology of “promoting fracture complexity + expanding fracturing volume + highly fracture supporting + casing deformation prevention”, which effectively achieves the uniform fracture initiation, high-efficiency fracture propagation, full reservoir support and maximum reservoir stimulation volume. (4) Integrated fine management of flowback. The “four-factor” flowback and reservoir stimulation technology is developed, and the fine flowback and production analysis platform is established, which achieve the “double breakthroughs” of reservoir damage reduction and gas well stimulation. By using the above technology system, high-yield gas flow has been obtained in Well Zi 201 for the first time in China in the Cambrian shale reservoir with a depth of greater than 4500 m, and the replication of high-yield production has successfully been achieved in Well Weiye 1H, which support to initially identify a favorable area of nearly 3000 km² with the depth of shallower than 5000 m and gas resources of nearly 2×10¹² m³. The high-yield well cultivation technology and method lay a solid foundation for solving difficulties in large-scale and high-efficiency development of ultra-deep shale gas in the Cambrian Qiongzhusi Formation.

中图分类号:

TE122.1

郑马嘉, 郭兴午, 伍亚, 赵文韬, 邓琪, 谢维扬, 欧志鹏. 四川盆地德阳—安岳裂陷槽寒武系筇竹寺组超深层页岩气地质工程一体化高产井培育实践与勘探突破[J]. 中国石油勘探, 2024, 29(3): 57-67.

Zheng Majia, Guo Xingwu, Wu Ya, Zhao Wentao, Deng Qi, Xie Weiyang, Ou Zhipeng. Cultivation practice and exploration breakthrough of geology and engineering integrated high-yield wells of ultra-deep shale gas in the Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen, Sichuan Basin[J]. China Petroleum Exploration, 2024, 29(3): 57-67.

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