Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (1): 126-136.doi: 10.12108/yxyqc.20250111

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Main controlling factors and hydrocarbon accumulation model of Carboniferous reservoir in Chepaizi Uplift，Junggar Basin

GUI Shiqi1,2, LUO Qun1,2, HE Xiaobiao1,2, WANG Qianjun3, WANG Shichen1,2, WANG Liang1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
    2. Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, SINOPEC Shengli Oilfield Company, Dongying 257000, Shandong, China
  • Received:2024-09-21 Revised:2024-10-22 Online:2025-01-01 Published:2025-01-04

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Abstract: Using seismic，logging，oil test，core，casting thin，physical property analysis and physical simulation experiments，the configuration relationship of hydrocarbon accumulation elements，enrichment law research and main controlling factors of hydrocarbon accumulation of Carboniferous reservoir in Chepaizi Uplift of Junggar Basin were discussed. The results show that：（1）The reservoir lithology in the study area is mainly tuff，andesite and breccia，and the reservoir space is mainly secondary pores and fractures. The porosity mostly less than 8%， and the permeability is concentrated in 0.1-10.0 mD，which belongs to ultra-low porosity and ultra-low permeability reservoir.（2）The enrichment，migration and accumulation elements of the reservoir are controlled by the union of three elements of“fault-reservoir-shell”：Deep and large faults are the channel of vertical migration of oil and gas；Weathering and leaching can improve reservoir physical properties and provide effective storage space for oil and gas enrichment；The Carboniferous itself and its overlying mudstone are generally relatively tight，form a good reservoir-cap combination with the fracture volcanic reservoirs；The configuration relationship between strike-slip faults and cap rocks plays an important role in controlling the vertical and lateral migration of oil and gas.（3）It is concluded that the reservoirs in the study area as a whole have the characteristics of “dual source hydrocarbon supply，multi-system transport，multi-type caprock，multi-layer oil-bearing，multireservoir type，and compound oil-bearing area”. There are significant differences in reservoir accumulation models in different regions and different depths. Horizontally，the near source is“fault blanket transport，lateral filling， near source weathering crust accumulation model”，and the far source is“dual source hydrocarbon supply， multiple transport types，hard shell sealing，far source fault shell accumulation model”. Vertically，the shallow part is“dual-source hydrocarbon supply，multiple transport types，hard shell sealing，shallow weathering crust accumulation mode”，and the deep part is“dual-source hydrocarbon supply，fault transport，tight rock sealing， deep fault body accumulation mode”.

Key words: volcanic reservoir, physical simulation, deep and large faults, weathering and leaching, dual source hydrocarbon supply, Carboniferous, Chepaizi Uplift, Junggar Basin

CLC Number: 

  • TE122.1
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