陆相小凹陷是否发育页岩油

北美海相页岩油勘探开发取得巨大成功，引发了页岩油革命。近年来，中国的渤海湾、松辽等盆地页岩油勘探取得突破，揭示了陆相页岩油具有良好的发展前景。页岩油赋存在生油岩中，含油气盆地不缺烃源岩，但页岩油聚集成藏需要源、储、保存等多要素耦合。苏北盆地为典型的陆相断陷湖盆，油气资源丰度相对较低，到底发育什么样的岩性组合？有机质富集程度如何？主要储集空间在哪？是否具备页岩油形成的有利条件？有利的勘探区带分布在哪？The great success of exploration and development of marine shale oil in North America has triggered the shale oil revolution. In recent years, breakthroughs have been made in shale oil exploration in China’s Bohai Bay and Songliao basins, revealing that continental shale oil has good development prospects. Shale oil is found in source rocks, which are widespread in petroleum-bearing basins. However, shale oil accumulation requires multi-factor coupling such as source, storage, and preservation. The Subei Basin is a typical continental faulted lake basin with relatively low abundance of oil and gas resources. What kind of lithological combination does it develop? How rich is the organic matter? Where is the main storage space? Does it have the favorable conditions for the formation of shale oil? Where are the favorable exploration zones?

中国石化华东油气分公司勘探开发研究院昝灵、骆卫峰、印燕铃、荆晓明发表于《石油实验地质》的《苏北盆地溱潼凹陷阜宁组二段页岩油形成条件及有利区评价》论文中，作者通过对溱潼凹陷阜二段泥页岩段生烃、储集条件及含油性分析，落实有利勘探层段，综合岩性、压力、裂缝预测，评价有利区带，对于深化中等热演化盆地的页岩油勘探潜力认识，具有一定的理论和现实意义。ZAN Lin, LUO Weifeng, YIN Yanling, JING Xiaoming (Wuxi Research Institute of Petroleum Geology, PEPRIS, SINOPEC) published a paper named “Formation conditions of shale oil and favorable targets in the second member of Funing Formation in Qintong Sag, Subei Basin” in “Petroleum Geology & Experiment”. The favorable targets of shale oil exploration were optimized based on the analyses of hydrocarbon generation, reservoir conditions and oil enrichment of the shale sections in the second member of Funing Formation in the Qintong Sag, Subei Basin. Some favorable zones were predicted according to the properties of lithology, pressure and fractures. The research has certain theoretical and practical significance for deepening the understanding of shale oil exploration potential in moderate thermal evolution basins.

研究表明，溱潼凹陷阜二段富有机质泥页岩厚度大、分布广，热演化程度适中，有机质类型好，具备页岩油形成的物质基础。阜二段岩性主要为含灰泥岩、灰质泥岩，泥页岩孔隙度发育，储集空间主要为溶孔、黏土矿物和碳酸盐矿物晶间孔，纹层和微裂缝控制了储层渗透性。阜二段Ⅲ-Ⅴ亚段脆性矿物含量适中，以石英、方解石和白云石为主，游离烃含量较高，为页岩油勘探的最有利层段。溱潼凹陷时堰和储家楼深凹带是页岩油成藏最有利区。The organic-rich mud shale in the second member of the Funing Formation of the Qintong Sag is thick and widely distributed. It is moderately thermally evolved, and has good organic matter types, providing a material basis for the formation of shale oil. The lithology of the second member of Funing Formation is mainly lime-bearing mudstone and lime mudstone. The shale has developed various pores such as dissolved pores and intercrystalline pores among clay minerals and carbonate minerals. Laminae and micro-fractures control the permeability of the reservoir. From the third to the fifth section of the second member of Funing Formation, the content of brittle minerals is high, mainly composed with quartz, calcite and dolomite. The free hydrocarbon content (S1) is high, referring the most favorable layers for shale oil exploration of the sections mentioned above. The Shiyan and Chujialou depression zones in the Qintong Sag are the most favorable areas for shale oil accumulation.

研究结果发表于《石油实验地质》2021年43卷第2期。The results of the study were published in “Petroleum Geology & Experiment”, Volume 43, Issue 2, 2021.

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