Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 59-70.doi: 10.3969/j.issn.1673-8926.2017.01.008

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Influencing factors of tight reservoirs and favorable diagenetic facies： a case study of Chang 8 reservoir of the Upper Triassic Yanchang Formation in Maling Oilfield,Ordos Basin

WANG Meng1,2,3, ZENG Ming3, CHEN Hong'ao4, YANG Gang4, XU Jifang4, QIU Haibin4, GUO Hongguang4, WANG Jiamin4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, 610500 Chengdu, China;
    3. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingcheng 745100, Gansu, China;
    4. Changqing Division of Logging Limited Company, CNPC, Xi'an 710021, China
  • Received:2016-06-27 Revised:2016-09-07 Online:2017-01-21 Published:2017-01-21

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Abstract: The Chang 8 reservoir of the Upper Triassic Yanchang Formation in Maling Oilfield is characterized by tight sandstone of typical low porosity and low permeability. To analyze the influences of diagenesis on reservoir densification and evaluate favorable diagenetic facies, based on the data of core observation, cast thin section, mercury injection test, scanning electron microscopy and X-ray diffraction test, the reservoir petrology, pore structure and physical properties of Chang 8 reservoir were studied, the influence of different diagenesis on reservoir quality was discussed, a standard of diagenetic facies division was established, and the distribution of favorable diagenetic facies area was evaluated. The Chang 8 sandstone is characterized by strong microscopic heterogeneity and striped- shaped or lentoid, which have a good matching with subaqueous distributary channel and mouth bar sand bodies. The sandstone experienced medium to strong compaction, medium to strong cementation, and weak dissolution. The compaction, siliceous cementation and carbonate cementation led to reservoir densification synthetically. The presence of illite resulted in permeability reduce; chlorite coating, hydrocarbon emplacement, feldspar and debris dissolution contribute to reservoir development; kaolinite indicates the formation of secondary porosity, while it would cause permeability damage. The sandstones were divided into six types of diagenetic facies, among these diagenetic facies, chlorite- authigenic quartz cementation facies and dissolution facies are favorable diagenetic facies, which developed in the upper and middle of large scale Chang 81 and small scale Chang 82 reservoir.

CLC Number: 

  • TE122.2
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