岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 21–31.doi: 10.12108/yxyqc.20190403

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地南部延长组长8油藏油气充注期次

丁超1, 郭顺2, 郭兰3, 郭小波1, 杜贵超1, 吴洪帅1   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 陕西延长石油(集团)有限责任公司资源与勘探开发部, 西安 710075;
    3. 延长油田股份有限公司, 陕西 延安 716000
  • 收稿日期:2018-12-19 修回日期:2019-04-28 出版日期:2019-07-21 发布日期:2019-06-21
  • 作者简介:丁超(1983-),男,博士,讲师,主要从事盆地构造与油气成藏地质学方面的教学与研究工作。地址:(710065)陕西省西安市雁塔区电子二路东段18号。Email:dingchao608@163.com。
  • 基金资助:
    国家青年科学基金项目"有机-无机协同作用对湖相泥页岩纹层间孔隙连通性的影响机制"（编号：41702127）、陕西省自然科学基础研究计划项目"鄂尔多斯盆地南部奥陶系油气成藏年代及其临界转换参数"（编号：2017JQ4013）和西安石油大学博士科研启动基金项目"鄂尔多斯盆地南部铜川地区三叠系构造热演化史"（编号：2014BS04）联合资助

Hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin

DING Chao1, GUO Shun2, GUO Lan3, GUO Xiaobo1, DU Guichao1, WU Hongshuai1   

  1. 1. School of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Department of Resource Exploration and Development, Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
    3. Yanchang Oil Field Co., Ltd., Yan'an 716000, Shaanxi, China
  • Received:2018-12-19 Revised:2019-04-28 Online:2019-07-21 Published:2019-06-21

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摘要： 为了研究鄂尔多斯盆地南部延长组长8油藏的油气充注期次，开展了储集层中包裹体宿主矿物的成岩序列分析和包裹体均一温度测试。结果表明：①鄂尔多斯盆地南部延长组长8油藏发育3期烃类包裹体，第1期包裹体分布在石英矿物早期裂缝或石英颗粒内部溶蚀区，均一温度为61.1~121.7℃；第2期包裹体分布在石英加大边内部或方解石胶结物中，均一温度为106.2~155.7℃；第3期包裹体分布在切穿石英及其加大边的晚期裂缝中，均一温度为92.2~130.5℃。②结合研究区的构造热演化史可以得出，延长组长8油层组第1期油气充注发生在早侏罗世-晚侏罗世（192.5~152.0 Ma），为早期油气成藏；第2期油气充注发生在晚侏罗世-早白垩世（152.0~126.0 Ma），为主要成藏时期；第3期油气充注发生在古近纪（60.0~36.5 Ma），为晚期油气成藏。该研究成果对鄂尔多斯盆地南部寻找次生油气藏具有重要勘探意义。

关键词: 流体包裹体, 均一温度, 油气充注, 延长组, 三叠系, 鄂尔多斯盆地南部

Abstract: In order to determine hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin,the diagenetic evolution sequence of sand reservoir and homogenization temperature of fluid inclusion(FI)analysis were carried out. The results show that:(1)the Chang 8 reservoir show three stages of geochronology of hydrocarbon charging,the first stage of hydrocarbon FI that show brine inclusions are mainly hosted early fracture and dissolution area of quartz,and the homogenization temperature of associated brine inclusions is in the range from 61.1℃ to 121.7℃. The second stage of hydrocarbon FI that show brine inclusions are mainly hosted quartz overgrowths and calcite cement,and the homogenization temperature of associated brine inclusions is in the range from 106.2℃ to 155.7℃. The third stage of hydrocarbon FI that show brine inclusions are mainly hosted late fractures cutting through quartz and its overgrowths,and the homogenization temperature of associated brine inclusions is in the range from 92.2℃ to 130.5℃.(2)Combining with the tectonic thermal evolution history of the study area,it can be concluded that the first hydrocarbon charging stage is early oil-gas accumulation processes from Early Jurassic to Late Jurassic(192.5-152.0 Ma),the second stage is key processes of hydrocarbon occurred from Late Jurassic to Early Cretaceous(152.0-126.0 Ma),and the third stage is processes of adjustment and accumulation of hydrocarbon occurred in Paleogene(60.0-36.5 Ma). The study results is of great significance to secondary hydrocarbon reservoir exploration in southern Ordos Basin.

Key words: fluid inclusion, homogenization temperature, hydrocarbon charging, Yanchang Formation, Triassic, southern Ordos Basin

中图分类号: 

  • TE122.1
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