Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 143-152.doi: 10.12108/yxyqc.20180316

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Reservoir configuration and remaining oil distribution patterns of nearshore subaqueous fan: a case from E31 reservoir in Qigequan Oilfield, Qaidam Basin

CHANG Haiyan1,2, YAN Yaozu1,2, CHEN Gengxin1,2, GUO Ning3, XIANG Yiwei3, YANG Huijie4   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, China National Petroleum Corporation, Lanzhou 730020, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    4. Department of Natural Gas, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2017-12-13 Revised:2018-02-12 Online:2018-05-21 Published:2018-05-21

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Abstract: In order to solve the development difficulties caused by rapid phase change of reservoir and strong heterogeneity in nearshore subaqueous fan,taking the E31 reservoir of Qigequan Oilfield in Qaidam Basin as an example,through lithology description and analysis of coring holes,combined with casting thin section and logging curve characteristics,the reservoir configuration units division and well-tie section comparison were carried out. With the aid of the dynamic data of dense well network,the sand body distribution characteristics and scale in the reservoir configuration units were defined,and the identification chart of the configuration units at all levels and the internal configuration pattern of the nearshore subaqueous fan were established. The results show that the target layer E31 can be divided into root fan,middle fan and end fan subfacies from bottom to top,and subdivided into five fifth-order configuration elements and nine fourth-order configuration elements. There are five remaining oil distribution patterns of E31 reservoir,including remaining oil formed by fault sheltering,remaining oil in non-mainstream line detention zone,remaining oil formed by rhythmic differences between different configuration units, remaining oil formed by dam-permeability buffer zone and remaining oil formed by insufficient formation of injection wells. The results can provide a geological basis for the further exploration of Qigequan Oilfield.

Key words: ultra low permeability reservoir, pore assembly types, movable fluid saturation, main current throat radius, flooding type, Ordos Basin

CLC Number: 

  • TE122.2
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