Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 12-21.doi: 10.12108/yxyqc.20200602

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

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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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

CLC Number: 

  • P618.13
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