岩性油气藏 ›› 2019, Vol. 31 ›› Issue (1): 87–95.doi: 10.12108/yxyqc.20190110

• 油气地质 • 上一篇    下一篇

古环境与有机质富集控制因素研究——以鄂尔多斯盆地南缘长7油层组为例

李森1, 朱如凯1,2,3, 崔景伟1,2,3, 柳涵1   

  1. 1. 中国石油勘探开发研究院, 北京 100083;
    2. 国家能源致密油气研发中心, 北京 100083;
    3. 中国石油天然气集团公司油气储层重点实验室, 北京 100083
  • 收稿日期:2018-01-12 修回日期:2018-05-09 出版日期:2019-01-18 发布日期:2019-01-18
  • 第一作者:李森(1994-),男,中国石油勘探开发研究院在读硕士研究生,研究方向为细粒沉积学。地址:(100083)北京市海淀区学院路20号中国石油勘探开发研究院。Email:806356629@qq.com。
  • 基金资助:
    国家重点基础研究发展计划项目“中国陆相致密油（页岩油）形成机理与富集规律”（编号：2014CB239001）资助

Paleoenvironment and controlling factors of organic matter enrichment: a case of Chang 7 oil reservoir in southern margin of Ordos Basin

LI Sen1, ZHU Rukai1,2,3, CUI Jingwei1,2,3, LIU Han1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. National Energy Center of Tight Oil and Gas, Beijing 100083, China;
    3. Key Laboratory of Oil and Gas Reservoir, CNPC, Beijing 100083, China
  • Received:2018-01-12 Revised:2018-05-09 Online:2019-01-18 Published:2019-01-18

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547

摘要： 长7油层组富有机质页岩在鄂尔多斯盆地南缘广泛分布，但其形成古环境和控制因素存在争议。对鄂尔多斯盆地铜川地区瑶页1井长7油层组开展高密度元素扫描和有机地球化学分析，重建长7页岩沉积期古环境，揭示富有机质页岩形成的控制因素。结果表明，古生产力由下而上呈现逐渐降低的趋势；长7沉积期水体微咸并逐渐淡化；水体有由富氧到贫氧再到富氧的变化规律。富有机质页岩热解、有机碳的测试显示干酪根类型包括Ⅱ1，Ⅱ2，Ⅲ，有机质的质量分数为0.44%~26.90%，纵向上有机质特征差异性较大。综合页岩的有机质特征和各项古环境参数，精细分油层组研究认为有机质丰度主要受到水体还原程度的控制，而有机质类型则与古生产力相关，火山灰对古生产力提高有积极作用。

关键词: 沉积环境, 有机质富集, 长7油层组, 鄂尔多斯盆地

Abstract: The organic-rich shales of Chang 7 oil reservoir are widely developed in the southern margin of Ordos Basin,however,the mechanism of organic accumulation in the shales,sedimentary environment and controlling factors are controversial. High-density element scanning and organic geochemical analysis were carried out for Chang 7 member in well Yaoye 1 in Tongchuan area,to reconstruct the paleoenvironment of Chang 7 shales,revealing the controlling factors of organic-rich shale formation. It is found that the paleoproductivity decreased gradually from bottom to top,the water body was brackish and gradually desalinated during Chang 7 sedimentary period,and the water body changed from oxygen-rich to oxygen-poor and then to oxygen-rich. Pyrolysis and organic carbon measurements of organic-rich shales show that the organic matter types include Ⅱ1,Ⅱ2 and Ⅲ,and the abundance of organic matter is 0.44%-26.9%. The characteristics of organic matter in longitudinal direction are quite different. According to the of organic matter characteristics and paleoenvironment parameters of shales, the abundance of organic matter is mainly controlled by the reduction degree of water body,and the type of organic matter is related to paleoproductivity. Volcanic ash plays an active role in improving paleoproductivity.

Key words: sedimentary environment, organic matter enrichment, Chang 7 oil reservoir, Ordos Basin

中图分类号: 

  • TE121.3
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