Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 102-112.doi: 10.12108/yxyqc.20200511

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Genesis and corrosion mechanism of zeolite of Lower Urhe Formation of Permian in Mahu Depression

LEI Haiyan1,2, FAN Shun3, XIAN Benzhong4, MENG Ying1,2, YANG Hongxia1,2, YANG Qi5, QI Jing1,2   

  1. 1. Key Laboratory of Conglomerate Reservoir Exploration and Development, CNPC, Karamay 834000, Xinjiang, China;
    2. Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. Baikouquan Oil Production Plant, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    4. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    5. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2020-03-23 Revised:2020-05-27 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to study the genesis and dissolution mechanism of zeolites in the Lower Urhe Formation of Permian in Mahu Depression,thin section identification,fluorescence analysis,field emission scanning electron microscopy,electron probe analysis,energy spectrum analysis and inclusion test were carried out. The results show that:(1)The mainly zeolite group minerals in the study area are turbidite,followed by heulandite,analcite,clinoptilolite and zeolites. The zeolites have both high-temperature and low-temperature genesis types.(2)The genesis of zeolites mainly includes two types:in the early diagenetic stage,it is dominated by alteration of volcanic materials,and the cores cemented by zeolites are mostly loose and easy to disperse;in the late diagenetic stage, it is dominated by pore water crystallization,and the cores are mostly dense. Heulandite,analcite,clinoptilolite and pyroxene are mainly caused by tuffaceous alteration,while turbidites are caused by tuffaceous alteration and pore water crystallization.(3)On the plane,the type and content distribution of zeolites are controlled by the sedimentary facies,while the dissolution difference is controlled by the supply of organic acids. Most of the laumontite are developed in the thick coarse-grained glutenite of the fan delta front,and most of the heulandite is developed in the tuffaceous conglomerate in the front of the fan delta plain. In the glutenite reservoir in delta front or near fracture development zone near the deep-water source rock development area,the turbidite has high dissolution degree and high-quality reservoir development. The research results can be used to guide the study of zeolites bearing reservoirs and the exploration of oil and gas in the Lower Urhe Formation of Permian in Mahu Depression.

Key words: zeolite group minerals, dissolved pore, tuffaceous alteration, pore water crystallization, Lower Urhe Formation, Mahu Depression

CLC Number: 

  • TE122.1
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