玛页1井风城组页岩含油性与烃类赋存状态

doi:10.7657/XJPG20220607

摘要/Abstract

摘要：

页岩含油性评价以及烃类赋存状态是页岩油甜点评价与优选的关键，以玛页1井下二叠统风城组页岩为研究对象，通过岩石热解、多温阶热解、X射线衍射等分析方法，开展页岩含油性评价以及烃类赋存状态研究，在此基础上开展风城组页岩油甜点层优选。研究表明，玛湖凹陷风城组页岩主要为3类岩相组合，风二段烃源岩品质相对最好，风一段烃源岩品质一般，风三段烃源岩品质相对较差，有机质显微组分以镜质组和惰质组为主，处于成熟阶段，具备良好的页岩油物质基础，纵向上风城组页岩可划分为6个含油性较好的甜点层，风二段顶部以及中部纹层状长英质页岩发育段的含油性最好，烃类赋存状态主要为游离态，游离油占总油80%以上，游离油主要赋存于粒间孔和层理缝中，呈连续分布状，具备较好的含油性基础和可动资源前景，研究成果为风城组页岩油下一步的勘探部署与有效开发提供理论依据和技术支撑。

关键词: 准噶尔盆地, 玛湖凹陷, 玛页1井, 风城组, 页岩油, 含油性, 烃类赋存状态

Abstract:

The oil-bearing properties and hydrocarbon occurrence states of shale are crucial to evaluating and selecting shale oil sweet spots. Through the analysis such as rock pyrolysis, multi-temperature-gradient pyrolysis and X-ray diffraction, the oil-bearing properties and hydrocarbon occurrence states of the shale in the Lower Permian Fengcheng formation in Well Maye-1, Mahu Sag, were investigated, and then the optimal sweet spot intervals for shale oil in the Fengcheng formation were defined. The results show that the Fengcheng formation shale in Mahu sag is mainly composed of three lithofacies associations. The quality of source rocks is the best in the Feng 2 member, partially moderate in the Feng 1 member, and poor in the Feng 3 member. The macerals of organic matter in the rocks are mainly vitrinite and inertinite, indicative of a mature stage, showing a good material basis for shale oil accumulation. Vertically, the Fengcheng formation shale can be divided into 6 sweet spot intervals with good oil-bearing properties. The lamellar felsic shale intervals at the top and in the middle of the Feng 2 member have the best oil-bearing property, and contain hydrocarbons mainly in free state, where free oil accounts for more than 80% of the total oil content and mainly occurs in intergranular pores and bedding fractures continuously, suggesting a good oil-bearing foundation and a good prospect of movable resource. The research results provide a theoretical basis and technical support for subsequent exploration and development of the shale oil in the Fengcheng formation

Key words: Junggar basin, Mahu sag, Well Maye-1, Fengcheng formation, shale oil, oil-bearing property, hydrocarbon occurrence state

中图分类号:

TE122.23

钱门辉, 王绪龙, 黎茂稳, 李志明, 冷筠莹, 孙中良. 玛页1井风城组页岩含油性与烃类赋存状态[J]. 新疆石油地质, 2022, 43(6): 693-703.

QIAN Menhui, WANG Xulong, LI Maowen, LI Zhiming, LENG Junying, SUN Zhongliang. Oil-Bearing Properties and Hydrocarbon Occurrence States of Fengcheng Formation Shale in Well Maye-1，Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 693-703.

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