石油学报 ›› 2001, Vol. 22 ›› Issue (4): 31-34.DOI: 10.7623/syxb200104006

• 地质勘探 • 上一篇    下一篇

藏北羌塘盆地上三叠统肖茶卡组沉积相与含油性

胡明毅, 吴一慧   

  1. 江汉石油学院地质系 湖北荆州 434102
  • 收稿日期:1999-12-06 修回日期:2000-05-15 出版日期:2001-07-25 发布日期:2010-05-21
  • 作者简介:胡明毅,男,1965年10月生,1989年毕业于中国地质大学,获硕士学位,现为江汉石油学院地质系副教授,中国地质大学(北京)在读博士生

SEDIMENTARY FACIES AND HYDROCARBON OCCURRENCE OF UPPER TRIASSIC XIAOCHAKA FORMATION IN QIANGTANG BASIN

HU MingYi,WU Yihui   

  1. Jianghan Petroleum Institute, Jingzhou 434102, China
  • Received:1999-12-06 Revised:2000-05-15 Online:2001-07-25 Published:2010-05-21

摘要: 羌塘盆地是发育在青藏高原北部的一个中生代海相沉积盆地,面积达16×104km2.晚三叠世时期,羌塘盆地总体呈现出一隆两坳的古地理格局,并发育了一套陆源碎屑和碳酸盐岩混积型沉积.该区沉积类型多样,主要发育有三角洲、滨岸、碳酸盐台地、深水沉积等4种沉积体系.在此基础上,分析了该区油气地质条件.认为研究区北部坳陷带成油物质基础较好,中央隆起带两侧的三角洲砂体是油气运移的主要指向.

关键词: 沉积体系, 岩相古地理, 油气分布, 上三叠统, 羌塘盆地

Abstract: Qiangtang Basin is Mesozoic marine sedimentary basin located on Qingzhang Plateau,with one hundred and sixty thousand square kilometers.The lithofacies paleogeographic environment of Upper Triassic is characterized by one uplift and two depression:the North Qiangtang Depression、the Central Uplift and the South Qiangtang Depression,and developed a set of mixed carbonate-terrigenous clastic sediments.There are four mainly kinds of depositional systems in the Xiaochaka Formation,such as delta depositional system、littoral depositional system、carbonate platform depositional system、deep-water depositional system.Among of them,the carbonate platform system is most widely distributed in the area.The laws of hydrocarbon distribution and the major reservoir sandbodies of Upper Triassic are concluded that the North Qiangtang Depression poesses good hydrocarbon generating condition,and delta sandbodies in both side of the central uplift is the direction of hydrocarbon Migration.In the meantime,this paper pointed out the direction of future oil and gas exploration in Qiangtang Basin.

Key words: Sedimentary system, lithofacies paleogeography, oil and gas distribution, Upper Triassic, The Qiangtang Basin

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