Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 57-65.doi: 10.3969/j.issn.1673-8926.2014.04.009

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Characteristics of major gas-bearing reservoirs in western Sulige Gas Field

XIE Qingbin1， TAN Xinyu1，2，GAO Xia3，LIANG Xinping1，LAI Changjie1，WANG Zhifang1
  

  1. 1. College of Geosciences， China University of Petroleum， Beijing 102249， China； 2. No. 5 Oil Production Plant， Zhongyuan Oilfield Company， Sinopec， Puyang 457001， Henan， China； 3. PetroChina Research Institute of Petroleum Exploration and Development， Beijing 100083， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

In western Sulige Gas Field, the eighth member of Shihezi Formation and the first member of Shanxi Formation are the major gas-bearing reservoirs. Shan 1 member developed anastomosing river deposit, and He 8 member developed braided river deposit, in which the facies transited from braided river to meandering and anastomosing river from bottom to top. The rock types of the main gas-bearing reservoirs are lithic sandstone and lithic quartz sandstone, with little quartz sandstone, and they are characterized by low compositional maturity. Pore spaces always occur as the combination form, the pore types are mainly composed of debris dissolved pores and intercrystal pores, and little primary intergranular pores. The pore structure has features of small pore-narrow throat, high displacement pressure and narrow main contribution throat. The average porosity is 6.23%, while the average permeability is 0.4 mD, so the reservoir is characterized by low porosity and low permeability. On the basis of diagenesis analysis, the reservoir is in the middle diagenetic phase B. The reservoir properties are mainly controlled by sedimentary microfacies and diagenesis, and the heterogeneity is strong.

Key words: heavy oil, productivity, permeability, reservoir, numerical simulation

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