Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 36-43.doi: 10.3969/j.issn.1673-8926.2017.02.005

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The oil families and their geochemical characteristics in Sanhantala Sag,Erlian Basin

WANG Hao1,2, WANG Feiyu1, JIANG Shuanqi3, WU Zhong3, XING Yawen3, LAN Baofeng3   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Northwest University, Xi'an 710069, China;
    3. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2017-01-11 Revised:2017-02-07 Online:2017-03-21 Published:2017-03-21

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Abstract: The Saihantala Sag is the one of hydrocarbon rich sags in Erlian Basin. The physical properties and geochemisty data of oil samples were analyzed to identify the feature and generation of oil in Saihantala Sag. The physical property data of oil show that the crude oil samples are in low-moderate maturity stage with low viscosity, low sulfur content and API in a range of 28°-39°. New geochemical data have been gathered from crude oil samples, and denote that the crude oil derived from source rocks with similar depositional environment and expelled hydrocarbon in different mature stages. Several variables including ratios of gammacerane/C30 hopane, C30*/ C29 Ts, Pr/Ph,diasteranes/regular steranes, and sterane isomerization parameters, were selected to carry out cluster analysis,and the crude oil in Sanhantala Sag can be divided into two oil families. Oil-family I mainly distributes in Lower Cretaceous K1 ba, K1 bt1 and expelled from source rocks in the late phase of oil window; Oil-family Ⅱ is mainly from K1 bt2 and derived from source rocks in the early phase of oil window. The data of crude oil suggest that the exploration zone should be aimed at the reservoirs of the K1 ba and K1 bt1.

Key words: tight sandstone reservoir , sedimentary environments, diagenesis, reservoire valuation, prospecting area

CLC Number: 

  • TE122.1+13
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