Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 136-146.doi: 10.12108/yxyqc.20240213

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and diagenetic evolution of Permian pyroclastic reservoirs in Jianyang area，Sichuan Basin

ZHANG Wenbo1, LI Ya2, YANG Tian1, PENG Siqiao2, CAI Laixing1, REN Qiqiang1   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2023-01-31 Revised:2023-02-17 Published:2024-03-06

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Abstract: As important unconventional reservoirs，pyroclastic reservoirs are of great significance for increasing oil and gas storage and production. Based on core observation，thin section identification，QEMSCAN scanning， X-ray diffraction，physical property analysis，inclusion temperature and carbon and oxygen isotope analysis，the characteristics and diagenetic evolution of Permian pyroclastic reservoirs in Jianyang area of Sichaun Basin were systematically analyzed. The results show that：（1）The rocks of Permian pyroclastic reservoirs in Jianyang area are mainly composed of volcanic breccia lava，tuff lava and melt-bonded volcanic breccia，with overall good physical properties，porosity ranging from 0.78% to 32.00%，average of 16.67%，permeability ranging from 0.001 to 2.680 mD，average of 0.125 mD，belonging to high porosity and low permeability reservoirs. The reservoir space is dominated by secondary pores and fractures，including devitrified pores，matrix dissolved pores and dissolved fractures.（2）Various diagenetic processes are developed in the study area，including fusion， compaction，devitrification，cementation and dissolution. （3）The study area experienced three diagenetic stages：syndiagenetic stage，epidiagenetic stage and burial diagenetic stage. The diagenetic evolution was influenced by deep hydrothermal fluids，atmospheric fresh water and organic acid fluids. On the one hand，fluid activities cause the precipitation of hydrothermal minerals or carbonate cements，which has a destructive effect on reservoir physical properties. On the other hand，hydrothermal fluids promote oil and gas migration，and the dissolution and transformation of acidic fluids play a constructive role in the development of reservoir pores.

Key words: pyroclastic reservoir, high porosity and low permeability reservoir, deep hydrothermal fluid, atmospheric fresh water, organic acid fluid, Permian, Jianyang area, Sichuan Basin

CLC Number: 

  • TE122.2
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