岩性油气藏 ›› 2020, Vol. 32 ›› Issue (6): 12–21.doi: 10.12108/yxyqc.20200602

• 油气地质 • 上一篇    下一篇

下刚果盆地早白垩世Pointe Indienne组湖相浊积岩特征及石油地质意义

余烨1,2, 蔡灵慧1,2, 尹太举3, 王莉2, 张兴强3, 徐吉丰3   

  1. 1. 湖南科技大学 页岩气资源利用湖南省重点实验室, 湖南 湘潭 411201;
    2. 湖南科技大学 资源环境与安全工程学院, 湖南 湘潭 411201;
    3. 长江大学 地球科学学院, 武汉 430100
  • 收稿日期:2020-01-08 修回日期:2020-02-20 出版日期:2020-12-01 发布日期:2020-10-30
  • 第一作者:余烨(1983-),男,博士,讲师,硕士生导师,主要从事沉积地质与油气地质方面的教学与研究工作。地址:(411201)湖南省湘潭市雨湖区桃园路2号湖南科技大学页岩气实验室。Email:yuye1983@163.com
  • 通信作者: 尹太举(1971-),男,博士,教授,博士生导师,主要从事油气田勘探与开发方面的教学与研究工作。Email:yintaij@yangtzeu.edu.cn。
  • 基金资助:
    湖南省自然科学基金项目“南海北部白云-荔湾凹陷韩江组深水水道沉积构型及其控制因素研究”（编号：2019JJ50151）和湖南省教育厅科研项目“珠江口盆地珠江组强制海退沉积层序特征及其演化模式研究”（编号：18C0374）联合资助

Characteristics and hydrocarbon significance of lacustrine turbidite of Early Cretaceous Pointe Indienne Formation in Lower Congo Basin

YU Ye1,2, CAI Linghui1,2, YIN Taiju3, WANG Li2, ZHANG Xingqiang3, XU Jifeng3   

  1. 1. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
    2. School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
    3. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2020-01-08 Revised:2020-02-20 Online:2020-12-01 Published:2020-10-30

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摘要： 为了明确下刚果盆地盐下重点勘探层系，采用沉积学、石油地质学的相关理论和方法，结合区域地质背景、钻测井数据和分析测试结果等资料，对下刚果盆地早白垩世Pointe Indienne组湖相浊积岩特征及其石油地质意义进行了探讨，并建立了Pointe Indienne组大型浊积扇的发育模式。结果表明：该浊积岩形成于深湖相沉积环境，其叠置砂体具有典型的浊流沉积特征，发育典型的鲍玛序列及特征沉积构造；该浊积砂岩为长石岩屑质石英砂岩或杂砂岩，其成分成熟度低、结构成熟度较差，表现为快速堆积的重力流沉积特征；该浊积砂岩内部识别出了多套完整和不完整的鲍玛序列，显示了厚层块状浊积岩和薄层或微层浊积岩的组合形式，指示了浊积扇内扇、中扇、外扇的沉积特征；该浊积砂岩为中孔低渗储层，与Pointe Indienne组上段和下段发育的厚层优质烃源岩接触，具有良好的生、储、盖组合，是下刚果盆地盐下油气勘探的重点层系。

关键词: 浊积岩, 深湖相, Pointe Indienne组, 早白垩世, 下刚果盆地

Abstract: In order to define the key subsalt exploration layer in the Lower Congo Basin,the characteristics and hydrocarbon significance of lacustrine turbidite of Early Cretaceous Pointe Indienne Formation in the Lower Congo Basin were investigated by using the relevant theories and methods of sedimentology and petroleum geology,combined with regional geological background, drilling and logging data and the test analysis results, and the development model of large turbidite fan of Pointe Indienne Formation was established. The results show that the turbidite was formed in the deep lake sedimentary environment,and its superimposed sandbody has typical turbidite sedimentary characteristics,such as typical Bauma sequence and characteristic sedimentary structure. The turbidite sandstone is feldspathic detrital quartz sandstone or greywacke with low component maturity and poor structural maturity,which is characterized by rapid accumulation of gravity flow sedimentation. A number of complete and incomplete Bauma sequences have been identified in the turbidite sandstone,showing the combination of thick massive turbidite and thin or micro turbidite,indicating the sedimentary characteristics of the inner,middle and outer fans of the turbidite fan. The turbidite sandstone is a medium porosity and low permeability reservoir,which is in contact with the thick and high-quality source rocks developed in the upper and lower part of Pointe Indienne Formation. It has good source reservoir cap assemblage,and is the key layer for the subsalt oil and gas exploration in the Lower Congo Basin.

Key words: turbidite, deep lacustrine facies, Pointe Indienne Formation, Early Cretaceous, Lower Congo Basin

中图分类号: 

  • P618.13
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