石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (3): 558-570.doi: 10.11743/ogg20190311

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地西南部彬长区块三叠系延长组7段3亚段页岩油勘探前景探讨

李志明1,2,3, 陶国亮1,2,3, 黎茂稳1,2,3, 钱门辉1,2,3, 谢小敏1,2,3, 蒋启贵1,2,3, 刘鹏1,2,3, 鲍云杰1,2,3, 夏东领4   

  1. 1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126;
    2. 页岩油气富集机理与有效开发国家重点实验室, 江苏 无锡 214126;
    3. 中国石化 油气成藏重点实验室, 江苏 无锡 214126;
    4. 中国石化 石油勘探开发研究院, 北京 100083
  • 收稿日期:2019-01-20 修回日期:2019-03-11 出版日期:2019-06-28 发布日期:2019-04-26
  • 作者简介:李志明(1968-),男,研究员,油气地球化学、页岩油气地质。E-mail:lizm.syky@sinopec.com。
  • 基金资助:
    国家科技重大专项(2017ZX05049-001)。

Discussion on prospecting potential of shale oil in the 3rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin

Li Zhiming1,2,3, Tao Guoliang1,2,3, Li Maowen1,2,3, Qian Menhui1,2,3, Xie Xiaomin1,2,3, Jiang Qigui1,2,3, Liu Peng1,2,3, Bao Yunjie1,2,3, Xia Dongling4   

  1. 1. Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu 214126, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China;
    3. Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi, Jiangsu 214126, China;
    4. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2019-01-20 Revised:2019-03-11 Online:2019-06-28 Published:2019-04-26

摘要: 为探讨鄂尔多斯盆地西南部彬长区块三叠系延长组7段3亚段(简称长73亚段)页岩油勘探前景,在对B-1井取心段岩心系统观察描述基础上,结合白光和荧光岩心图像扫描等资料,依据典型样品的热解、多温阶热释(解)和有机岩石学分析结果,系统评价了长73亚段典型岩性的含油性及其赋存形式。研究结果表明:长73亚段取心段主体是一套优质烃源层系,处于主生油窗早期阶段,黑色纹层状页岩、层状泥岩含油性好但以束缚油为主,油饱和指数OSI平均为45 mg/g (n=116),含油级别主要属中含油,不具页岩油潜力;灰褐色纹层状、薄层状及块状凝灰岩、凝灰质(泥质)粉砂岩夹层含油性好,并以游离油为主,有运移油贡献,主要赋存于微裂缝与碎屑矿物的粒间孔和粒缘缝中,油饱和指数OSI平均为200 mg/g (n=28),具有页岩油潜力。彬长区块伊陕斜坡范围区长73亚段褐灰色凝灰岩、凝灰质(泥质)粉砂岩夹层是页岩勘探的有利层段,具有一定页岩油勘探前景。

关键词: 含油性, 延长组, 页岩油, 彬长区块, 鄂尔多斯盆地

Abstract: To discuss the prospecting potential of shale oil in the 3rd sub-member of the Triassic Chang 7 member(Chang 73) in Binchang block,southwestern Ordos Basin,the oil content and oil occurrence of typical rock types in Well B-1 were systematically observed and evaluated based on systematic observation and description of cores and using the results of Rock-Eval pyrolysis,thermovaporization in different temperature ranges and organic petrological analysis in combination with scanned images of cores with white light and fluorescence.The results show that the cored interval in Chang 73 from Well B-1 is quality source rock at early stage of major oil window.The black laminated shale and layered mudstone are characterized by high oil content but dominance of immobile oil,and the average OSI is 45 mg/g(n=116),indicating no prospecting potential for shale oil.Whereas,the gray-brown laminated,thin-bedded and massive tuff and the interbedded tuffaceous(argillaceous) siltstone are characterized by high oil content,predominance of free oil and contributions from migrated oil.The oil mainly occurs in microfractures,intergranular pores and grain boundary fractures of detrital minerals,and its average OSI is 200 mg/g(n=28),indicating good prospecting potential for shale oil.In conclusion,the gray-brown tuff and the interbedded tuffaceous(argillaceous) siltstone on the Yishan slope in Binchang block are favorable intervals for shale oil exploration and have some shale oil prospecting potential.

Key words: oil content, Yanchang Formation, shale oil, Binchang block, Ordos Basin

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