Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 35-47.doi: 10.12108/yxyqc.20250604

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and main controlling factors of high-quality reservoirs in Cambrian Longwangmiao Formation of Penglai Gasfield, Sichuan Basin

LI Yong1, ZHANG Ya1, ZHOU Gang1, QU Haizhou2,3, LONG Hongyu1, LI Chenglong1, ZHANG Chi1, CHEN Di1   

  1. 1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2025-06-13 Revised:2025-08-25 Online:2025-11-01 Published:2025-11-07

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Abstract: In recent years, well Dongba 1 in Penglai Gasfield in central and northern Sichuan Basin has obtained industrial gas flow through testing in Cambrian Longwangmiao Formation. Based on relevant data such as core samples, thin sections, cathodoluminescence, conventional logging, imaging logging, and geochemical information, the reservoir characteristics, genesis, and distribution patterns of Longwangmiao Formation in Penglai Gasfield, northern central Sichuan Basin were systematically studied. The results show that: (1) The high-quality reservoir of Longwangmiao Formation in Penglai Gasfield are mainly composed of oolitic dolomite, followed by doloarenite. The reservoir space is primarily karst caves, needle-like dissolved pores, residual intergranular dissolved pores, and intragranular dissolved pores, accompanied by a few fractures. The overall porosity mainly ranges from 2% to 6%, and permeability is mainly 0.001-1.000 mD, characterized as a low-porosity and low-permeability reservoir. The reservoir types of Longwangmiao Formation can be divided into karst cave type(with an average porosity of 4.2% and permeability of 0.209 mD), dissolved pore type(with an average porosity of 3.6% and permeability of 0.052 mD)and pore type(with an average porosity of 3.0% and permeability of 0.034 mD), with the former two being high-quality reservoirs.(2) The development of high-quality reservoirs is mainly influenced by sedimentary facies, penecontemporaneous meteoric water dissolution, penecontem-poraneous dolomitization, shallow buried bedding karstification, and structural fractures. Among them, shallow buried karstification has significant impact on high-quality reservoirs in the western study area.(3) High-quality reservoirs are mainly distributed in the PS15 wellblock in the western region, with thickness generally over 10 m and locally exceeding 30 m. They are also distributed in the PS8-PY1 wellblock in the eastern region, with thickness generally ranging from 8 m to 15 m.

Key words: oolitic dolomite, fracture-vuggy carbonate reservoir, karstification, dolomitization, Longwangmiao Formation, Cambrian, Penglai Gasfield, Sichuan Basin

CLC Number: 

  • TE122
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