Xinjiang Petroleum Geology ›› 2010, Vol. 31 ›› Issue (4): 361-364.

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Characteristics and Favorable Reservoir Facies Belt of Sublacutrine Fan of Nantun Formation in Beier Sag, Hailaer Basin

XU Xian-sheng1, WANG Jing-xin2, YANG Ting3, WANG Wen-di4, ZHANG Lei5, WANG Zhe3   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
    3. Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing 102249, China;
    4. Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China;
    5. CBM, PetroChina, Beijing 100013, China
  • Received:2010-03-24 Revised:2010-03-24 Published:2020-10-19

Abstract: The Nantun formation of Lower Cretaceous in northwestern Beier sag in Harlaer basin develops typical sublacutrine fan deposit. According to the core, well logs and grain-size analysis data, the sublacutrine fan located in the back slope and near paleohigh can be divided into three subfacies of inner, middle and outer fans and six microfacies in this region. The great height difference of geography formed by the regulatory faulting activity in the back slope allows this area to develop large scale alluvial fan-fan delta-sublacutrine fan deposit system by the way from provenance to lacustrine basin. The mudstone in the semi-deep lacustrine-deep lacustrine near the sublacutrine fan is not only source rock, but also preferable cap rock. So the conglomerate and sandstone in the fan is favorable to form lithologic trap. The sand-body developing belt of braided channel microfacies in middle fan is the mid-porosity and mid-low permeability reservoir facies belt and favorable for petroleum exploration.

Key words: Beier sag, Nantun formation, sublacutrine fan, sedimentary character, depositional model, favorable reservoir facies

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