新疆石油地质 ›› 2006, Vol. 27 ›› Issue (4): 511-513.

• 国外油气地质 • 上一篇    下一篇

中非地区B盆地下白垩统烃源岩地球化学特征

陈忠民1,2, 刘洛夫1, 程顶胜2   

  1. 1.中国石油大学 石油天然气成藏机理教育部重点实验室, 北京 102249;
    2.中国石油 天然气勘探开发公司, 北京 100083
  • 收稿日期:2005-12-05 出版日期:2006-08-01 发布日期:2020-10-19
  • 作者简介:陈忠民(1968-), 男, 四川宜宾人, 高级工程师, 在读博士研究生, 石油地质,(Tel) 010-62098614(E-mail) czm681006@petrochina.com.cn.
  • 基金资助:
    中国石油天然气集团公司2004年研究课题的部分研究成果(04B60204)资助

Geochemical Characteristics of Source Rock of Lower Cretaceous in B Basin, Central Africa Region

CHEN Zhong-min1,2, LIU Luo-fu1, CHENG Ding-sheng2   

  1. 1. Key Laboratory of Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Petroleum, Beijing 102249, China;
    2. Natural Gas Exploration and Development Corporation, PetroChina, Beijing 100083, China
  • Received:2005-12-05 Online:2006-08-01 Published:2020-10-19

摘要: 中非地区B盆地下白垩统泥岩是该盆地目前唯一证实的烃源岩。对该套烃源岩的地球化学研究表明,盆地烃源岩有机质丰度高,为好烃源岩,有机质类型主要为Ⅱ1型;由于构造反转、剥蚀和高地温梯度,现今生烃门限深度普遍偏浅;平面上,由北西西向南东东方向生烃门限深度变深;有效烃源岩为下白垩统阿普第阶下部和巴列姆阶;盆地北部斜坡带浅层油气存在生物降解作用,与其深层油藏存在明显亲缘关系;推测盆地存在多个生烃灶。

关键词: 中非地区, B 盆地, 地球化学特征, 烃源岩, 下白垩统

Abstract: The shale of Lower Cretaceous is uniquely verified to be source rock in B basin of Central Africa region. The geochemistry study indicates that the source rock in B basin is characterized by high organic matter abundance with II1 type of organic matter, being a good hydrocarbon source rock. Influenced by the tectonic inversion, erosion and high geothermal gradient, the present depths of hydrocarbon generation threshold are usually shallower than the normal. From NWW to SEE, the depth of threshold becomes deeper. The shale of lower Aptian stage and Barremian stage of Lower Cretaceous is the effective source rock. The oil and gas in shallow zone of slope belt in northern B basin undergo biodegradation, and have obvious relativeness with oils in deeper zone by analyzing their biological markers. It is predicted that there exist several oil kitchens in B basin.

Key words: Central Africa region, B Basin, geochemistry, characteristic, source rock, Lower Cretaceous

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