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。本文基于风险探井钻探后的突破对该区沉积古地貌、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，并注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三种储集类型，均具有较好的储集能力和较高的含油性；（3）三类页岩油的I类有利区总面积超过三千平方公里，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的指导和借鉴作用。

关键词: 松辽盆地；三肇凹陷；青山口组；陆相页岩油；有利区

Abstract: The high-quality mud shale of the Qingshankou Formation in the northern Songliao Basin is primarily developed in the Gulong and Sanzhao Sags. Major strategic breakthroughs in shale oil have been achieved in the Gulong Sag. However, systematic studies on whether the Sanzhao Sag, with relatively low shale maturity, possesses favorable geological conditions for shale oil accumulation, controlling accumulation factors, and exploration potential remain scarce. This study, based on breakthroughs from risk exploration well drilling to provide a comprehensive analysis of the sedimentary paleogeomorphology, paleoenvironment, reservoir lithofacies, and reservoir evaluation parameters in the region. It focuses on comparing the shale oil enrichment geological characteristics of the Sanzhao Sag with those of the Gulong Sag.The results indicate: (1) under a transgressive environment, the Sanzhao Sag features saline and semi-saline water conditions, exhibiting high paleo-productivity under semi-humid to humid climates and anoxic environments; (2) the Qingshankou Formation in the Sanzhao Sag contains three types of reservoir facies: high organic laminar shale, laminated shale, and thinly interbedded siltstone-shale, all of which exhibit excellent reservoir properties and high oil content; (3) the total area of favorable I-type zones for shale oil exceeds 3,000 square kilometers, with the Sanzhao Sag hosting a unique favorable I-type zone for laminated shale -type shale oil, containing substantial resources.The findings suggest that the Sanzhao Sag is poised to become the next shale oil replacement zone after the Qijia-Gulong Sags, offering valuable guidance for predicting and exploring sweet spots in shale oil within 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,白斌,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,Bai Bin,Chen Dongxia,Bi He. The geological conditions and exploration potential of shale oil accumulation in Qingshankou Formation of Sanzhao Sag, Northern Songliao Basin[J]. China Petroleum Exploration, 2025, 30(6): 101-119.

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