Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 17-26.doi: 10.12108/yxyqc.20180303

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Pore throat structure characteristics of Chang 31 reservoir in HuachiHeshui area, Ordos Basin

LIAO Mingguang1,2, GUO Yunfei1,2, YAO Jingli3, LIAO Jijia1,2, NAN Junxiang3   

  1. 1. Sichuan Provincial Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration & Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2017-10-16 Revised:2018-02-03 Online:2018-05-21 Published:2018-05-21

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Abstract: The Chang 31 low permeability sandstone reservoir in Huachi-Heshui area of Ordos Basin suffers low efficiency in water injection development, which results from the poor formation physical properties and complex pore throat structure. In order to formulate a reasonable development scheme,the pore throat characteristics were investigated by high pressure mercury injection and rate-controlled mercury injection technique. Microscopic identification and scanning electron microscope analysis were also conducted to discuss the genesis of microscopic pore throat structure. The results of high pressure mercury injection experiment show that reservoir porosity development could be classified into three types, including superior one,moderate one and poor one. According to the constant-rate mercury injection experiment,the reservoirs could be classified into typeⅠ large pore and midfine throat, type Ⅱ large pore and fine throat,and type Ⅲ large pore and tiny throat. Regarding the formations with different pore-throats structures,the pore characteristics are similar but the throat characteristics are evidently different. The reservoir physical properties are influenced by effective pore volume per unit volume and throat parameters. Porosity is mainly influenced by effective pore volume per unit volume, effective throat volume per unit volume and number of effective throats per unit volume. Permeability is mainly influenced by effective pore volume per unit volume and the radius of the throat. The pore throat ratio of typeⅠ,typeⅡ and typeⅢ reservoirs increase successively and the pore throat configuration relationship deteriorates successively. The pore throat ratio is negatively correlated with the permeability. The micropore throat structure is controlled by cementation and dissolution. The weaker cementation resulted in stronger dissolution and better micropore throats structure.

Key words: hydrous pyrolysis, expelled oil, wash-out oil, residual oil, total liquid hydrocarbons, group compositions

CLC Number: 

  • TE122
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