Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 100-107.doi: 10.12108/yxyqc.20200210

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Analysis of electrical characteristics of tight sandstone reservoirs

HOU Zhenxue1, CHEN Zhen2, NIU Quanbing3, SONG Guangjian2, LIU Yanbin4   

  1. 1. Well Tech of China Oilfield Services Limited, Langfang 065201, Hebei, China;
    2. Fengcheng Oilfield Operating Area, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China;
    4. Zhundong Oil Production Plant, PetroChina Xinjiang Oilfield Company, Fukang 831511, Xinjiang, China
  • Received:2019-03-26 Revised:2019-06-27 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to clarify the complex electrical characteristics of tight sandstone reservoirs,the electrical characteristics of tight sandstone reservoirs of Permian upper Shihezi Formation in L block in the eastern margin of Ordos Basin were analyzed based on high resolution array induction data,combined with nuclear magnetic logging,core micro-analysis data and gas testing results,and the causes of resistivity differences and different intrusion characteristics were found out. The results show that fluid property of tight sandstone reservoir is not the dominant factor for the difference of resistivity. The low resistivity is mainly caused by co-conductivity of bound water caused by clay minerals at the edge of pore throat and capillary water in the connectable pore throat. The medium and high resistivity is mainly related to the non-conductivity of isolated pore. The invasion characteristics are mainly related to gas-bearing property and the communication ability of throat. Low resistivity negative difference reservoir is indicator of gas-bearing property and high-quality pore structure. No difference in low resistivity is related to the immovable water conductivity caused by flaky throat,capillary resistance and clay minerals preventing drilling fluid invasion. No difference between medium and high resistivity is related to the inability of conduction and invasion of isolated pore. It is the common influence of sedimentation,diagenesis and later accumulation that leads to the formation of such electrical characteristics. The research results are of great significance for guiding exploration and development of tight reservoirs in the study area.

Key words: electrical characteristics, tight sandstone, array induction resistivity, upper Shihezi Formation, Ordos Basin

CLC Number: 

  • TE132.2
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