Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 68-81.doi: 10.12108/yxyqc.20200307

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics and high-precision sequence division of lacustrine carbonate rocks of BV Formation in L oilfield of Santos Basin，Brazil

LUO Xiaotong1,2, WEN Huaguo1,2, PENG Cai3, LI Yun1,2, ZHAO Yan1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    3. Southwest Geophysical Research Institute, CNPC BGP Inc., Chengdu, Sichuan 610014, China
  • Received:2019-10-24 Revised:2019-11-24 Online:2020-05-21 Published:2020-04-30

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Abstract: Santos Basin in Brazil is a famous large-scale petroliferous sedimentary basin in the world in recent years,and its sub lacustrine microbial carbonate reservoir has become a hot spot of oil and gas exploration. There are few researches on high-precision sequence division and sedimentary mechanism of main reservoirs,which restrict the exploration and development of oil and gas fields in this area. Based on the previous research results,combined with the drilling, logging and seismic data in the basin, this paper made high-precision sequence stratigraphic and sedimentary division of Barra Velha Formation in L oilfield in Santos Basin,clarified the evolution law of the sedimentary sequence in the lake basin,and established the sedimentary model of the microbial reef of BV Formation in L oilfield in the basin. The results show that the BV Formation can be divided into one third-order sequence and four fourth-order sequences. As an important reservoir facies belt of BV Formation,lacustrine microbial reef facies was distributed in the steep slope break belt on both sides of the lake basin and developed in high water level environment,which was mainly controlled by paleogeomorphology and volcanism. The research results could provide a geological basis for the exploration of the carbonate rocks in the sub salt lacustrine facies in Santos Basin and even in the whole coastal salt bearing basin in southeastern Brazil.

Key words: microbial reefs, sequence stratigraphy, sedimentary mechanism, Barra Velha Formation, Santos Basin

CLC Number: 

  • TE121.3
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