石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (3): 553-565.doi: 10.11743/ogg20220306

• 油气地质 • 上一篇    下一篇

中国海域煤型油气成因理论

张功成1,2(), 陈莹1, 李增学2(), 李友川1, 兰蕾1, 刘世翔1, 孙瑞1   

  1. 1.中海油研究总院有限责任公司,北京 100029
    2.山东科技大学 地球科学与工程学院,山东 青岛 266590
  • 收稿日期:2021-05-18 修回日期:2022-03-21 出版日期:2022-06-01 发布日期:2022-05-06
  • 通讯作者: 李增学 E-mail:zhanggch@cnooc.com.cn;lizengxue@126.com
  • 作者简介:张功成,男,(1966—),博士、教授级高级工程师,海洋石油天然气地质学。E?mail: zhanggch@cnooc.com.cn
  • 基金资助:
    国家自然科学基金项目(41872172);国家科技重大专项(2016ZX05026);国家重点基础研究发展规划(973)项目(2009CB219400)

Theory on genesis of coaliferous petroleum in the China Sea

Gongcheng Zhang1,2(), Ying Chen1, Zengxue Li2(), Youchuan Li1, Lei Lan1, Shixiang Liu1, Rui Sun1   

  1. 1.CNOOC Research Institute,Beijing 100029,China
    2.College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China
  • Received:2021-05-18 Revised:2022-03-21 Online:2022-06-01 Published:2022-05-06
  • Contact: Zengxue Li E-mail:zhanggch@cnooc.com.cn;lizengxue@126.com

摘要:

对中国海区及邻域14个含煤盆地组成的巨型含煤盆地带的煤型油气进行了系统分析。该巨型含煤盆地带经历了古新世、始新世、早渐新世、晚渐新世和中新世—上新世等5个成煤期,发育了三角洲、扇三角洲和潮坪-潟湖3种成煤环境。巨型含煤盆地带以煤型烃源岩为主,煤系与海相烃源岩具有“二元结构”发育模式。通过对烃源岩、凝析油、天然气样品的实验分析,发现该巨型含煤盆地带煤成烃具有“四阶段”生烃模式,并且煤型烃源岩生气极限Ro(镜质体反射率)可达到4.38 %,极大地拓展了天然气生成范围。该巨型含煤盆地带煤型烃源岩形成了凹陷边缘煤系和凹陷内部陆源海相两种油气成藏模式,在这两种成藏模式控制下,形成了多个大型煤型油气富集区。

关键词: 生烃模式, 二元结构, 成煤环境, 聚煤域, 含煤盆地带, 中国海区及邻域

Abstract:

The study systematically analyzes coaliferous petroleum in a giant coal-bearing basin belt consisting of 14 coal-bearing basins in the China Sea and its surroundings. The evolution of the giant coal-bearing basin belt spanned five periods of coal formation, that is the Paleocene, the Eocene, the Early Oligocene, the Late Oligocene and the Miocene-Pliocene, in coal-forming environments of deltas, fan deltas and tidal flat-lagoons. The coaliferous source rocks dominate in the giant basin belt, featuring a “dual structure” of coaliferous and marine source rocks development. Experimental analysis of source rock, gas condensate, and natural gas samples indicates that the coal-bearing basin belt is characterized by a “four-stage” hydrocarbon generation model, and the coal-generating limit of the coaliferous source rocks (reflectance of vitrinite Ro) can reach up to 4.38 %, greatly expanding the lower limit of natural gas generation. The coaliferous source rocks in the basin belt feature two modes of hydrocarbon accumulation, that is, accumulation of hydrocarbons from the coal measures on the margin of the sag and that from the terrigenous marine source rocks within the sag, under the guidance of which multiple large-scale coaliferous hydrocarbon enrichment zones are developed.

Key words: hydrocarbon generation mode, dual structure, coal forming environment, coal-accumulating domain, coal-bearing basin belt, China Sea and its surroundings

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