松辽盆地北部三肇凹陷青山口组页岩油富集地质条件及勘探潜力

doi:10.3969/j.issn.1672-7703.2025.06.008

摘要/Abstract

摘要： 松辽盆地北部青山口组优质泥页岩主要发育在古龙凹陷和三肇凹陷，其中古龙凹陷页岩油取得了重大战略性突破，然而针对页岩成熟度相对较低的三肇凹陷是否具备页岩油的富集地质条件、富集主控因素和勘探潜力如何缺乏系统研究。基于风险探井钻探后的突破对三肇凹陷沉积古地貌、沉积古环境、储层岩相、储层评价参数等方面开展综合研究工作，并着重探讨了与古龙凹陷相对比，三肇凹陷的页岩油富集地质特征。研究结果表明：（1）三肇凹陷在海侵背景下，具有咸水、半咸水—咸水环境，且在半湿润—湿润气候和贫氧环境下具备高的古生产力特征；（2）三肇凹陷青山口组发育了高有机质页理型页岩、纹层状页岩和薄层粉砂岩夹层型3种储集类型，均具有较好的储集能力和较高的含油性；（3）3类页岩油的Ⅰ类有利区总面积超过3000km²，其中三肇凹陷具有独特的Ⅰ类页理型页岩油有利区，资源量巨大。研究成果明确了三肇凹陷有望成为继齐家—古龙凹陷后的新的页岩油接替区，同时为实现盆地页岩油甜点区预测与规模勘探提供重要指导和借鉴作用。

关键词: 松辽盆地, 三肇凹陷, 青山口组, 陆相页岩油, 有利区

Abstract: In Northern Songliao Basin, the high-quality shale in Qingshankou Formation was mainly developed in Gulong and Sanzhao sags. Major strategic breakthroughs in shale oil have been achieved in Gulong Sag. However, there is a lack of systematic study on oil enrichment geological conditions, main controlling factors, and exploration potential of shale with relatively low maturity in Sanzhao Sag. Based on achievements in risk exploration wells, a comprehensive study has been conducted on sedimentary paleogeomorphology, paleoenvironment, reservoir lithofacies, and reservoir evaluation parameters, and shale oil enrichment geological characteristics in Sanzhao Sag have been discussed in detail by comparing with those in Gulong Sag. The results indicate that: (1) In the context of a transgressive environment, Sanzhao Sag was featured by saline and brackish–saline water environments, as well as high paleo-productivity given the semi-humid to humid climates and anoxic environment; (2) Three types of shale oil reservoirs were developed in Qingshankou Formation in Sanzhao Sag, i.e., organic-rich laminar shale, laminated shale, and thin siltstone interlayered shale, all of which had excellent reservoir storage capacity and high oil content; (3) The total area of ClassⅠ favorable zone of the three types of shale oil exceeds 3000 km², in which Sanzhao Sag hosts a unique ClassⅠ favorable zone of laminar type shale oil, with enormous resource amount. The study results confirm that Sanzhao Sag is the shale oil replacement zone after Qijia-Gulong sags, and provide significant guidance and reference for sweet spot prediction and large-scale shale oil exploration in the basin.

Key words: Songliao Basin, Sanzhao Sag, Qingshankou Formation, continental shale oil, favorable area

中图分类号:

TE122.11

周海燕, 王岚, 杨子杰, 商斐, 陈冬霞, 毕赫. 松辽盆地北部三肇凹陷青山口组页岩油富集地质条件及勘探潜力[J]. 中国石油勘探, 2025, 30(6): 101-119.

Zhou Haiyan, Wang Lan, Yang Zijie, Shang Fei, Chen Dongxia, Bi He. Geological conditions for shale oil enrichment in Qingshankou Formation and exploration potential in Sanzhao Sag, Northern Songliao Basin[J]. China Petroleum Exploration, 2025, 30(6): 101-119.

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