Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 65-73.doi: 10.12108/yxyqc.20180407

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Reservoir accumulation characteristics of Jurassic Yan'an Formation in Yanwu area, Ordos Basin

YE Bo1, LIANG Xiaowei1, SONG Juan1, CAO Runrong1, MAO Zhenhua2, HAO Bingying2   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields, Xi'an 710018, China
  • Received:2017-09-12 Revised:2017-11-28 Online:2018-07-21 Published:2018-07-21

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Abstract: The reservoir of Jurassic Yan'an Formation is characterized by small scale, complex forming characteristics and it is difficult to predict in Yanwu area, Ordos Basin. In order to make clear the main accumulation time and whether there is a secondary migration accumulation in geological history period, and to provide theoretical basis for exploration, the reservoir accumulation characteristics of Jurassic in Yanwu area was studied through testing means such as quantitative grain fluorescence, fluid inclusions and so on. The results show that the ancient oil-water interface rise and hydrocarbon dissipation had ever happened in Yan'an Formation. Some of the reservoirs had suffered damage or the secondary hydrocarbon migration had happened in geological history period.The reservoir accumulation period of Yan'an Formation in Yanwu area can be mainly divided into two stages. The early accumulation stage was at the end of Early Cretaceous, and the oil accumulation was mainly in the lower layers of Yan'an Formation. The late accumulation stage resulted by tectonic uplift was since Upper Cretaceous, and the oil accumulation was in the upper layers of Yan'an Formation. The accumulation range of the late stage is more far away from Chang 7 hydrocarbon generation center than the early stage. The present reservoir distribution pattern ofYan'an Formation inYanwu area was formed jointly by the two accumulation stages.

Key words: low resistivity reservoir, glauconite sandstones, bound water saturation, log interpretation, Oriente Basin

CLC Number: 

  • TE122
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