济阳坳陷陆相断陷盆地页岩油开发的几点思考

Thoughts on Shale Oil Development in Continental Fault Basin in Jiyang Depression

济阳坳陷是典型陆相断陷盆地,其效益开发对中国页岩油可持续发展具有重要作用。陆相断陷盆地页岩油储层构造复杂、岩相类型多样,流体性质复杂,效益开发难度大。济阳坳陷经过研究评价、试验开发和规模建产3个阶段的探索,取得了重要进展。为此,系统性总结了页岩油优质甜点评价、立体开发优化、高效储层改造、储层补能提高采收率等页岩油开发技术所面临的挑战,提出了工程地质双甜点评价、井网层系组合优化、CO_(2)前置极限射流密切割压裂、注气补能和化学提高采收率等技术措施和效益开发管理模式,初步形成了陆相断陷盆地页岩油开发技术和管理模式体系,对其后续发展方向提出了建议,为陆相断陷盆地页岩油效益开发提供了参考借鉴。

Jiyang Depression is a typical continental fault basin,and its beneficial development is of great significance for the sustainable development of shale oil in China.Shale oil reservoirs in continental fault basins have complex tectonics,diverse lithofacies types,and complicated fluid properties,making it difficult to achieve beneficial development.Significant progress was made in Jiyang Depression after three stages of exploration,including research and evaluation,experimental development,and large-scale production construction.To this end,the challenges faced by shale oil developing technologies,such as high-quality sweet spot evaluation,three-dimensional development and optimization,efficient reservoir stimulation,reservoir energy energy replenishment to enhance oil recovery,etc.were systematically summarized.Technical measures and beneficial development management models such as double sweet spot evaluation of engineering and geology,optimization of the combination of well pattern and layer system,CO2 prepad fracturing using extreme jet and dense perforation,gas injection for energy replenishment,and chemical enhanced oil recovery.The shale oil developing technologies and management model system for the continental fault basins were initially formed,suggestions on the future development direction were put forward,providing a reference for the efficient development of shale oil in continental fault basins.