Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 34-44.doi: 10.12108/yxyqc.20210504

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of high-quality glutenite reservoirs of Urho Formation in Manan area,Junggar Basin

WANG Jian1,2,3, ZHOU Lu1, JIN Jun2,3, XIANG Baoli2,3, HU Wenxuan4, YANG Yang2,3, KANG Xun4   

  1. 1. Stake Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay 834000, Xinjiang, China;
    4. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • Received:2021-03-08 Revised:2021-06-08 Online:2021-10-01 Published:2021-09-30

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Abstract: The glutenite reservoirs of Urho Formation in Manan area of Junggar Basin has large-scale exploration potential and is a favorable field for increasing reserves and production. The sedimentary microfacies, reservoir space types and reservoir properties of Urho Formation were systematically analyzed by means of rock and mineral identification, SEM, XRD and porosity and permeability analysis. The results show that Urho Formation was deposited in shallow water fan delta and seven sedimentary microfacies were developed, of which underwater channel sandy fine conglomerate and sandstone are the dominant sedimentary facies belt for reservoir development due to their good physical properties. During diagenesis, compaction and laumontite cementation significantly damaged primary intergranular pores, whereas the dissolution of laumontite cement and feldspar debris produced a large number of secondary pores. As a result, secondary pores became the dominant reservoir space, followed by residual intergranular pores and microfractures. Overall, the occurrence of high-quality reservoirs is mainly influenced by sedimentary microfacies, zeolite types and their content, and the activity intensity of acid geofluids charging these strata. The high-quality reservoirs were formed in a genesis model of sedimentary controlling-fault connectingacid fluid transforming. In the favorable microfacies such as subaqueous channel, when it had related to underlying source rocks by faults, the activity of acid hydrocarbon-bearing fluids was strong. The fluids promoted the dissolution of laumontite. The superimposed layers of subaqueous channels near the faults are high-quality reservoir of Urho Formation.

Key words: fan delta, glutenite reservoir, reservoir genesis, Urho Formation, Junggar Basin

CLC Number: 

  • TE122.2
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