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Volume 46 Issue 3
May  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(3): 510-521
XING Fengcun, LIU Ziqi, QIAN Hongshan, LI Yong, ZHOU Gang, ZHANG Ya, HUANG Maoxuan, LI Chenglong, LONG Hongyu. Characteristics of Longwangmiao reservoirs in Penglai gas area and comparison with those in Moxi-Gaoshiti area, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 510-521. doi: 10.11781/sysydz202403510
Citation: XING Fengcun, LIU Ziqi, QIAN Hongshan, LI Yong, ZHOU Gang, ZHANG Ya, HUANG Maoxuan, LI Chenglong, LONG Hongyu. Characteristics of Longwangmiao reservoirs in Penglai gas area and comparison with those in Moxi-Gaoshiti area, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 510-521. doi: 10.11781/sysydz202403510
shu

Characteristics of Longwangmiao reservoirs in Penglai gas area and comparison with those in Moxi-Gaoshiti area, central Sichuan Basin

doi: 10.11781/sysydz202403510
  • 1.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 3.

    Key Laboratory of Deep-time Geography and Environment Reconstruction and Applicationsof Ministry of Natural Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 4.

    Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China

  • Received Date: 2023-06-19
  • Rev Recd Date: 2024-03-28
  • Publish Date: 2024-05-28
    Abstract
  • The Lower Cambrian Longwangmiao Formation in the Penglai gas area has promising carbonate reservoirs and exhibit strong gas indications, making itself a pivotal exploration zone following the Anyue gas field in the central Sichuan region. However, the lack of clarity regarding reservoir development patterns has constrained exploration deployment. Through comprehensive analysis of the most recent drilling and testing data, this study systematically examines the reservoir characteristics and primary controlling factors of the Longwangmiao Formation in Penglai gas area. Results reveal a mixed sedimentary background of terrigenous debris and carbonate, with reservoirs predominantly situated in the middle and upper strata of the Longwangmiao Formation. The reservoir rock types are predominantly (residual) granular dolomite and crystalline dolomite. Main types of reservoir space include intergranular dissolved pores, intragranular dissolved pores, intercrystalline dissolved pores, and micro-fractures. The reservoir is characterized by low porosity and permeability, with thickness typically ranging between 10-42 m. Reservoir development is controlled by sequence stratigraphy, lithology and diagenesis, particularly evident in the granular dolomite and crystalline dolomite within the middle and upper sections of the progradational parasequence set. Key constructive diagenetic processes include atmospheric freshwater dissolution, oil and gas dissolution and fracture. A comparison with the Moxi-Gaoshiti area in the main area of Anyue gas field suggests similar controlling factors, primarily revolving around granular dolomite, dissolution and fracturing. Nonetheless, the Longwangmiao Formation reservoir in Penglai gas area exhibit distinctive traits such as high ash content, elevated terrigenous clastic content and limited penecontemporaneous exposure. Consequently, identifying high-energy granular dolomite and fine-grained dolomite exposed during the penecontemporaneous period, as well as dolomite modified by supergene karst, emerges as imperative in targeting reservoirs within the Penglai gas area.

     

    • All authors disclose no relevant conflict of interests.
    The study was designed by XING Fengcun and LIU Ziqi. The experimental operation was completed by XING Fengcun and LIU Ziqi. The manuscript was drafted and revised by XING Fengcun, LIU Ziqi, QIAN Hongshan, LI Yong, ZHOU Gang, ZHANG Ya, HUANG Maoxuan, LI Chenglong and LONG Hongyu. All authors have read the last version of the paper and consented to its submission.
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