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    Volume 48 Issue 7
    Jul.  2023
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    Article Contents
    Article Navigation >  Earth Science  > 2023  >  48(7): 2601-2613
    Su Xiaocen, Gong Lei, Fu Xiaofei, Gao Shuai, Zhou Xinping, Lu Qi, Qin Xinnan, Yin Xiaoxi, 2023. Fracture Distribution Characteristics and Effectiveness Evaluation of Tight Sandstone Reservoir of Chang 7 Member in Sanbian Area, Ordos Basin. Earth Science, 48(7): 2601-2613. doi: 10.3799/dqkx.2022.116
    Citation: Su Xiaocen, Gong Lei, Fu Xiaofei, Gao Shuai, Zhou Xinping, Lu Qi, Qin Xinnan, Yin Xiaoxi, 2023. Fracture Distribution Characteristics and Effectiveness Evaluation of Tight Sandstone Reservoir of Chang 7 Member in Sanbian Area, Ordos Basin. Earth Science, 48(7): 2601-2613. doi: 10.3799/dqkx.2022.116
    shu

    Fracture Distribution Characteristics and Effectiveness Evaluation of Tight Sandstone Reservoir of Chang 7 Member in Sanbian Area, Ordos Basin

    doi: 10.3799/dqkx.2022.116
    • 1.

      College of Geosciences, Northeast Petroleum University, Daqing 163318, China

    • 2.

      Bohai‒Rim Energy Research Institute, Northeast Petroleum University, Qinhuangdao 066004, China

    • 3.

      Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China

    • 4.

      Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China

    • Received Date: 2021-11-30
    • Publish Date: 2023-07-25
      Abstract
    • The matrix physical properties of tight sandstone reservoir are very poor. The development of natural fractures provides seepage channel and reservoir space for oil and gas migration and accumulation. The distribution of effective fractures significantly improves the reservoir permeability and single well production. Based on the core, thin section, logging data and relevant experimental analysis, the genetic types, development characteristics and distribution law of natural fractures in tight sandstone reservoir of the Chang 7 Member in Sanbian area of Ordos Basin were characterized, the fracture effectiveness was evaluated, and the main controlling factors affecting fracture effectiveness were analyzed. The main development type of macro fractures in the study area is structural fractures, diagenetic fractures can be observed in some cores, and the micro fractures are mainly intergranular fractures. The development degree of fractures is controlled by lithology, mechanical stratigraphy and diagenetic facies. Fracture effectiveness was evaluated by two parameters of fracture filling degree and fracture aperture. Fracture effectiveness is controlled by factors such as fracture formation time, diagenesis, fracture occurrence and current in-situ stress. Affected by diagenesis, cementation reduces fracture effectiveness, while dissolution improves fracture effectiveness. The effectiveness of late formed fractures is better than that of early formed fractures. Five sets of fractures are developed in the study area, including nearly E-W trending, NW-SE trending, nearly S-N trending, NNE-SSW trending and NEE-SWW trending fractures. Among them, the NEE-SWW trending fractures which are parallel to the direction of current maximum principal stress, have the largest aperture and the best effectiveness, followed by NNE-SSW trending and nearly E-W trending fractures. The nearly E-W trending and NW-SE trending fractures are nearly perpendicular to or at a high angle with the direction of current maximum principal stress, and the fracture aperture is relatively small and the effectiveness is poor.

       

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