Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 35-42.doi: 10.12108/yxyqc.20180305

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Quantitative evaluation on micro-heterogeneity of glutenite reservoir: a case from Kunbei Oilfield in Qiadam Basin

ZANG Shibin, ZHENG Yongxian, CUI Jun, MAO Jianying, ZHANG Xiaobo   

  1. Research Institute of Exploration & Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2017-10-24 Revised:2018-02-05 Online:2018-05-21 Published:2018-05-21

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Abstract: Different from the mono-pore media of routine sandstone reservoirs, glutenite reservoirs have the characteristics of dual-porosity media. Lager pores and smaller pores exist in glutenite reservoir simultaneously,as a result,the pore structure is complex and the micro-heterogeneity is strong. Lulehe Formation of Kunbei Oilfield in Qaidam Basin belongs to a glutenite reservoir. The capillary pressure curves have no horizontal parts,and pores distributions are obviously bimodal. The glutenite reservoir pore space of Kunbei Oilfield can be generally divided into two pore systems,one is the larger pore system which constitutes the preferred flowing paths and contributes 95% of flowing potentiality,and another the smaller one which constitutes non-preferred flowing paths and contributes 5% of flowing potentiality only. A parameter of main flowing space percentage obtained form the data of capillary pressure is precisely to describe the proportion of lager pores to the smaller ones of reservoir pore space, and then be used to evaluate quantitatively the micro-heterogeneity of glutenite reservoir. The results indicate that the average of main flowing space percentage in Kunbei Oilfield is 33%,that is,the larger pores take up smaller parts of reservoir pore space (about 1/3)but contribute greater permeability of the reservior,and the smaller pores take up most reservoir pore space (about 2/3)but contribute lesser flowing potentiality. The microheterogeneity of glutenite reservoir in Kunbei Oilfiled is severe.

Key words: diagenesis, secondary pores, Jurassic, Yuka-Jiulongshan area, northern margin of Qaidam Basin

CLC Number: 

  • TE122
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