西南石油大学学报(自然科学版)

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A Study on the Interlayer Within Thick Reservoir in KunBei Oilfield,Qaidam Basin

Li Yanli1*, Wang Aiping1, Zheng Hongjun1,2, Chen Gengxin1, Gou Yingchun1,2   

  1. 1. Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou,Gansu 730020,China
    2. Key Laboratory of Reservoir Description,PetroChina,Lanzhou,Gansu 730020,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

In the middle and late stage of oilfield development,the distribution of the interlayer within thick reservoir is the
main factor affecting the injection-production relation of single sand body and the remaining oil distribution. The lower segment
of Xiaganchaigou formation(E13)develops thick reservoir in the Q6 Block of Kunbei oilfield,Qaidam basin,and the thick oil
reservoir develops muddy interlayer. In this paper,an identification model of Muddy interlayer was set up by core calibration
logging,and this model is taken as a standard to carry out the identification of the interlayer in the entire area. According to the
profiles,plane distribution characteristics of the interlayer,the interlayer in the study area is divided into the stable,sub-stable
and unstable types. On the analysis of distribution law of 3 kinds of interlayer,the shale content parameter lower limit value is
taken as constraint condition,and stochastic modeling is used to predict the space distribution of the interlayer,3D distribution
model of the interlayer is establishedto improve geological basis for injection-production relationship adjustment and water
drive reserves producing degree of the reservoir.

Key words: thick reservoir, interlayer, identification model, stochastic modeling, Kunbei Oilfield, Qaidam Basin