Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 54-66.doi: 10.12108/yxyqc.20190606

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Diagenesis and secondary pore evolution of Middle and Upper Permian clastic rocks in Wu-Xia area,Junggar Basin

LI Jiasi1,2,3, FU Lei4, ZHANG Jinlong4, CHEN Jing4, NIU Bin3,5, ZHANG Shuncun1,   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou 730000, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Shixi Oilfield Operation District, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    5. Institute of Tibetan Plateau Research/Laboratory of Alpine Ecology and Biodiversity, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2019-01-11 Revised:2019-05-13 Online:2019-11-21 Published:2019-09-28

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Abstract: The Middle and Upper Permian clastic reservoirs in Wu-Xia area of Junggar Basin are deeply buried and poor in reservoir properties,mainly with secondary pores. Diagenesis is the most important factor affecting the development of secondary pores in middle-deep reservoirs. Based on casting thin section identification,scanning electron microscopy(SEM),X-ray diffraction analysis method with logging and mud logging data,the diagenesis and secondary pore evolution of the Middle and Upper Permian clastic rocks in Wu-Xia area were studied. The results show that the reservoir compositional maturity and textural maturity were low and the most pores were secondary pores. The average porosity of lower Urho Formation and Xiazijie Formation was 8.15% and 7.85% respectively,secondary pores account for 77.18% and 80.90% respectively,and the amount of hyperplasia of pores was 6.49% and 4.74% respectively. The clastic reservoir in the study area was mainly at the A-B stage of the middle diagenetic stage,and the diagenesis was dominated by compaction,cementation and dissolution. The degree of porosity loss caused by compaction and cementation was 24.5% and 6.14% respectively. Dissolution was the main cause of secondary pores and the dissolution of feldspar and debris particles contributed the most to secondary pore growth. Lower Urho Formation and Xiazijie Formation have the rate of 47.62% and 55.86% respectively. Affected by atmospheric water dissolution,fault zone and dissolution of organic acids,there are three secondary pore development zones vertically developed in the reservoir of the study area. The secondary pore development zones are important zones for finding relatively favorable reservoirs under low porosity and low permeability conditions.

Key words: clastic rocks, diagenesis, secondary pore evolution, Middle and Upper Permian, Junggar Basin

CLC Number: 

  • TE122.2
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