Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 109-116.doi: 10.12108/yxyqc.20180613

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Diagenetic facies types of tight reservoir and its effects on productivity: a case of Chang 8 reservoir in Jiangjiachuan area, Ordos Basin

XU Bo1,2, WANG Jian3, YU Ledan1,2, WANG Kaize1,2, DONG Fengjuan1,2, LIU Feng1,2   

  1. 1. Xi'an Shiyou University, Xi'an 710065, China;
    2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an 710065, China;
    3. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China
  • Received:2018-03-30 Revised:2018-06-02 Online:2018-11-16 Published:2018-11-16

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Abstract: Chang 8 reservoir in Jiangjiachuan area in southeast Ordos Basin belongs to near-source hydrocarbon accumulation without long-distance hydrocarbon migration. It is a typical tight oil sandstone reservoir with extralow porosity and ultra-low permeability. It is helpful for reservoir exploration and development through analyzing reservoir diagenetic facies and looking for favorable belt controlled by diagenetic facies. The test and analysis data of casting thin slice, scanning electron microscope, XRD data and cathode luminescence were used to study petrology characteristics, diagenesis types and diagenetic period. Based on the data of oilfield production, the characteristics and differences of different diagenetic facies and their influences on productivity were analyzed, and the favorable diagenetic facies distribution was predicted. The results show that Chang 8 reservoir is mainly composed of lithic arkose sandstone. Compaction and cementation seriously destroyed the primary pore structure of sandstone. Cementation of iron calcite and ferric dolomite is the decisive factor for the tight of the reservoir, and the dissolution in the diagenetic stage is beneficial to the improvement of the porosity and permeability of the reservoir. Most of the reservoirs were under the middle diagenetic stage A, part reservoir is under the early diagenetic stage B. The diagenetic facies can be divided into four types, including intergranular pore and feldspar dissolution diagenetic phase formed by chlorite cementation, intergranular pore and feldspar dissolution diagenetic phase formed by chlorite and illite cementation, feldspar dissolution diagenetic phase formed by illite cementation, and carbonate cementation phase. The favorable belt with good physical properties and maximum oil production is considered as the intergranular pore and feldspar dissolution diagenetic phase formed by chlorite cementation. This research result can provide practical reference for favorable reservoir prediction and efficient development in the study area.

Key words: diagenetic facies, diagenesis, heterogeneity, productivity, Chang 8 tight sand reservoir, Ordos Basin

CLC Number: 

  • TE122.2
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