天然气地球科学 ›› 2011, Vol. 22 ›› Issue (2): 315–323.doi: 10.11764/j.issn.1672-1926.2011.02.315

• 天然气地质学 • 上一篇    下一篇

西湖凹陷古近系花港组物源区特征分析

郝乐伟, 刘畅, 王琪, 王欢, 马晓峰, 唐俊, 廖朋   

  1. 1.中国科学院油气资源研究重点实验室,甘肃 兰州730000;
    2.中国科学院研究生院,北京100049;
    3.北京林业大学生物科学与技术学院,北京 100083;
    4.内蒙古科技大学数理与生物工程学院,内蒙古 包头 014010
  • 收稿日期:2010-04-29 修回日期:2010-09-20 出版日期:2011-04-10 发布日期:2011-04-10
  • 通讯作者: 郝乐伟haolewei66@163.com E-mail:haolewei66@163.com
  • 作者简介:郝乐伟(1985-),男,山东聊城人,博士研究生,主要从事储层沉积学与储层地球化学研究.
  • 基金资助:

    南海深水盆地油气资源形成与分布基础性研究(编号:2009CB219400);国土资源部全国油气资源战略调查与评价项目“南海北部陆坡深水海域油气资源战略调查与评价”(编号:XQ-2004-05);国家科技重大专项海洋深水区油气勘探关键技术(编号:2008ZX05000-025);中国科学院“西部之光”联合学者项目联合资助

Provenance Characteristics of Huagang Formation ( Paleogene) in Xihu Sag, East China Sea

HAO Le-Wei, LIU Chang, WANG Qi, WANG Huan, MA Xiao-Feng, TANG Dun, LIAO Peng-   

  1. 1.Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3.College of Biological Sciences
    and Biotechnology of Beijing Forestry University,Beijing 100083,China;4.School of Mathematics, Physics
    and Biological Engineering of Inner Mongolia University of Science and Technology,Baotou 014010,China
  • Received:2010-04-29 Revised:2010-09-20 Online:2011-04-10 Published:2011-04-10

摘要:

西湖凹陷花港组是研究区重要的储层之一,其物源一直是争论的焦点。应用砂岩碎屑组分特征,重矿物分析并结合砂地比等值线图精细描绘物源分支,从不同角度、不同层次对西湖凹陷花港组物源体系进行了精细研究。结果表明,西湖凹陷花港组物源主要来自凹陷的西部边缘,东部钓鱼岛隆褶带影响较小,具体分为3大分支:西部的海礁隆起为近物源、西北部虎皮礁凸起和东部钓鱼岛隆褶带物源的结合影响凹陷北部地区、西南部的渔山隆起为凹陷的中南部地区提供物源。通过对岩屑类型、长石特征、石英颗粒和重矿物的微观特征和稀土元素等特征的分析,推测出凹陷周边岩体性质,花港组的母岩主要是岩浆岩,其次为变质岩,沉积岩少见。变质岩主要发育在海礁隆起的中部,影响西部的平湖地区,沉积岩仅在钓鱼岛隆褶带北部地区少量发育。

关键词: 物源分析, 稀土元素配分模式, 重矿物组合, 花港组, 西湖凹陷

Abstract:

The Huagang Formation in Xihu sag is an important reservoir, of which the provenance has been the focus of debate at all times.The source branches are finely pictured according to the characteristics of debris composition and heavy mineral analysis combined with sand percent distribution map.The results show that the Huagang Formation provenance mainly originated from the western edge of Xihu sag and a little from the eastern Diaoyu islands fold belt.The provenance is specific divided into three branches: the western Haijiao uplift source, north-west Hupijiao uplift and east of the Diaoyu islands fold belt source which compensatively affect north area, and south\|west Yushan uplift source affecting the central and southern area.The natures of the rocks around depression are speculated by analyzing debris type, feldspar features, microscopic characteristics of quartz grains and heavy minerals, rare earth elements and so on.The rocks around the Xihu sag are mainly magmatic rocks, secondly metamorphic rocks, and rarely sedimentary rocks.Metamorphic rocks are developed in the middle of Haijiao uplift affecting western Pinghu area.Only a few Sedimentary rocks exit in the northern part of the Diaoyu islands fold belt.

Key words: Provenance analysis, REE distribution pattern, Heavy mineral assemblage, Huagang Formation, Xihu sag

中图分类号: 

  • TE121.3

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