Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 90-96.doi: 10.3969/j.issn.1673-8926.2017.01.011

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Characteristics and evolution of oil reservoir zones of Buqu Formation in the southern Qiangtang Depression

XIA Guoqing1,2, YI Haisheng1,2, LI Gaojie1, JIN Feng1, JI Changjun3, LI Qilai1   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2016-07-11 Revised:2016-09-07 Online:2017-01-21 Published:2017-01-21

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Abstract: Oil reservoir zones of Middle Jurassic Buqu Formation are widely exposed in southern Qiangtang Depression. Based on the geological occurrence,stratigraphic sequence,sedimentary facies and space distribution of oil reservoir zones,combined with paleogeography framework,the subsurface characteristics and evolution of the oil reservoir zones were studied. The results show that the oil reservoir zones developed in three blocks：Long' eni,Angdaercuo and Sairen,respectively,and they are characterized by east-west stable linear distribution and good stratification. A large number of reef bank facies residual structures can be seen in the reservoir,and they are associated with coquinite,bioclastic limestone,oolitic limestone and calcarenite. These oil reservoir zones are controlled by platform margin facies and the sea-level changes. At the early Buqu stage,the reef and shoal facies deposited along platform margin from Sairento Angbacundong. At the middle Buqu stage,with the rise of sea level,a series of parallel and linear platform margin facies formed by retrograding northward in Xiaogaxiaona-Rigaerbao, Zharen-Donglangpa and Riagen-Aozong. At the late Buqu stage,the progressive reef and bank facies advanced southward gradually along the platform margin with the drop of sea-level,and widely developed in Long' eni block.

CLC Number: 

  • TE121
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