石油学报 ›› 2013, Vol. 34 ›› Issue (1): 12-21.DOI: 10.7623/syxb201301002

• 地质勘探 • 上一篇    下一篇

塔里木盆地沙雅隆起下白垩统双源三幕油气充注成藏的流体包裹体证据

斯尚华 1  陈红汉 1,2  丰 勇 2  王月蕾 3   

  1. 1.中国地质大学资源学院 湖北武汉 430074 2.中国科学院地质与地球物理研究所兰州油气资源研究中心 甘肃兰州 730000; 3.中国石化胜利油田公司 山东东营 257015
  • 收稿日期:2012-07-16 修回日期:2012-10-21 出版日期:2013-01-25 发布日期:2013-04-09
  • 通讯作者: 斯尚华
  • 作者简介:斯尚华,男,1981年7月生,2005年毕业于长江大学,现为中国地质大学(武汉)博士研究生,主要从事油气成藏过程研究。
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2012CB214804)资助。

Two sources and three charging events of hydrocarbons in Lower Cretaceous reservoirs in Shaya uplift, Tarim Basin: evidence from fluid inclusion analysis

SI Shanghua 1  CHEN Honghan 1, 2  FENG Yong 2  WANG Yuelei 3   

  • Received:2012-07-16 Revised:2012-10-21 Online:2013-01-25 Published:2013-04-09

摘要:

对90块砂岩流体包裹体样品系统分析表明,塔里木盆地沙雅隆起下白垩统存在大量沥青和烃类包裹体,这些证据可以追踪盆地内油气的运移聚集和成藏过程。利用荧光观察确定包裹体类型主要有4种:气液两相油包裹体;纯气相包裹体;油-沥青两相包裹体;盐水包裹体。依据油包裹体荧光性质(荧光颜色、主峰波长和QF535),结合盐水包裹体均一温度-埋藏史投影方法,确定雅沙隆起下白垩统有1期3幕油充注:第1幕12~5Ma、第2幕5~2Ma、第3幕2~0Ma;通过油包裹体与油源层原油的荧光光谱对比,判定第1幕和第2幕为陆相油源充注,第3幕为海相油源充注。海相充注的油成熟度较陆相低,充注时间晚。成藏期为喜马拉雅中-晚期,且表现出连续、快速充注的特点。

关键词: 流体包裹体, 油气充注期次和时期, 多源油气藏, 下白垩统, 沙雅隆起

Abstract:

Lots of hydrocarbon inclusions and bitumen have been measured in 90 sandstone samples from the Lower Cretaceous of Shaya uplift, Tarim Basin, and the evidence from these measurements can be used to trace the hydrocarbon migration and accumulation history of the basin. Four types of inclusions were determined in fluorescence observation, i.e. gas-liquid biphase oil inclusions, pure gas inclusions, oil-asphalt inclusions and aqueous inclusions. According to fluorescence properties(fluorescent colors, λmax and QF535) of the oil inclusion and combined with the employment of homogenization temperature of aqueous inclusions projected on a burial history diagram, three oil charging events were determined, and they took place in 12-5Ma, 5-2Ma and 2-0Ma, respectively. By the fluorescence spectral comparison of the oil inclusion with the crude oil from oil-prone source beds, it could be concluded that the first and the second charging oils originated from terrigeneous source rocks while the third charging oil was derived from marine ones. The marine oil is characterized by a lower maturity and later charging time compared with the continental oil. Its hydrocarbon accumulation occurred mainly during the middle-late Himalayan period, and is characterized by continuous and rapid charging.

Key words: fluid inclusion, hydrocarbon charging event and age, multi-source reservoir, Lower Cretaceous, Shaya uplift