大庆石油地质与开发

2025, v.44;No.232(06) 44-53

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松辽盆地古龙页岩油高产主控因素与增储潜力
Main controlling factors of high production and potential for reserve increase of Gulong shale oil in Songliao Basin

罗庆,程心阳,张金友,郎岳,刘召,赵莹
LUO Qing,CHENG Xinyang,ZHANG Jinyou,LANG Yue,LIU Zhao,ZHAO Ying

摘要(Abstract):

松辽盆地古龙凹陷青山口组泥纹型页岩油是当前中国页岩油勘探的重要领域,但其富集高产主控因素尚不明确。以古龙凹陷青一段至青二段(Q_1—Q_9油层)为研究对象,通过系统分析沉积环境、岩相组合、储集空间及岩石力学性质,揭示了页岩油富集高产主控因素,并展开了增储潜力分析。结果表明:沉积水体环境控制了页岩的矿物粒度、组分及岩相组合的发育特征,进一步影响了“岩石组构+有机质赋存状态”的组合模式,并形成了2种储集空间类型;矿物粒度、岩相组合、孔缝系统、页理缝发育程度等微观力学弱面,主导了工程压裂造缝效果。基于上述认识,以Q_9油层高产模式为标杆,明确了Q_1—Q_8油层中多套具备“粗粒度、高游离烃含量(S_1)、高大孔占比、高弹性模量、低黏土含量”特征的有利层段,并圈定了其平面分布范围,支撑了多个油层共34.9×10~8 t石油预测地质储量的落实。研究成果为古龙页岩油的后续勘探开发工作提供了理论依据。
Mud laminae shale oil of Qingshankou Formation in Gulong Sag of Songliao Basin is a key target for current shale oil exploration in China. However, the main controlling factors of its enrichment and high production remain unclear. Taking Qing-1 Member to Qing-2 Member(Q_1-Q_9 reservoirs)in Gulong Sag as research object, through systematic analysis of sedimentary environment, lithofacies assemblage, reservoir space and rock mechanical properties, main controlling factors of shale oil enrichment and high production are revealed, and the potential for increasing reserves is analyzed. The results show that sedimentary water-body environment controls the development characteristics of mineral grain size, composition and lithofacies assemblage of the shale, further influencing the combination pattern of “ rock fabric + organic matter occurrence state”, and forming 2 types of reservoir spaces.Microscopic mechanical weak planes, including mineral grain size, lithofacies assemblage, pore-fracture system and lamellation fractures development, dominate the effect of engineering fracturing. Based on the aboved understandings, taking high-production model of Q_9 reservoir as a benchmark, favorable intervals in Q_1-Q_8 reservoirs are identified, characterized by “coarse grain size, high free-hydrocarbon content(S_1), high proportion of large pores, high elastic modulus and low clay content”, and their areal distribution is delineated, supporting the identification of 34.9×10~8 t of predicted geological reserves in multiple reservoirs. The research provides a theoretical basis for subsequent exploration and development of Gulong shale oil.

关键词(KeyWords): 松辽盆地;古龙页岩油;富集成藏;有利区带;增储潜力
Songliao Basin;Gulong shale oil;enrichment and accumulation;favorable zone;potential for reserve increase

Abstract:

Keywords:

基金项目(Foundation): 新型油气勘探开发国家科技重大专项“松辽盆地白垩系陆相页岩油勘探开发技术与集成示范”(2024ZD1404900);; 中国石油天然气集团有限公司科技项目“陆相页岩油规模增储上产与勘探开发技术研究”(2023ZZ15)

作者(Author): 罗庆,程心阳,张金友,郎岳,刘召,赵莹
LUO Qing,CHENG Xinyang,ZHANG Jinyou,LANG Yue,LIU Zhao,ZHAO Ying

DOI: 10.19597/J.ISSN.1000-3754.202509059

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