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Volume 15
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10.3390/min15020098
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Article

Key Characteristics and Controlling Factors of the Gas Reservoir in the Fourth Member of the Ediacaran Dengying Formation in the Penglai Gas Field, Sichuan Basin

by
Hongwei Chen
1,
Shilin Wang
1,*,
Ahmed Mansour
1,2,
Qirong Qin
1,
Mohamed S. Ahmed
3,
Yongjing Cen
4,
Feng Liang
4,
Yuan He
5,
Yi Fan
5 and
Thomas Gentzis
6,*
1
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
2
Geology Department, Faculty of Science, Minia University, Minia 61519, Egypt
3
Department of Geology and Geophysics, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
4
PetroChina Southwest Oil & Gas Field Company, Central and Northern Sichuan Gas Production Management Office, Suining 629000, China
5
Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu 610041, China
6
Core Laboratories LP, 6316 Windfern Road, Houston, TX 77040, USA
*
Authors to whom correspondence should be addressed.
Minerals 2025, 15(2), 98; https://doi.org/10.3390/min15020098
Submission received: 13 December 2024 / Revised: 15 January 2025 / Accepted: 18 January 2025 / Published: 21 January 2025
(This article belongs to the Section Mineral Exploration Methods and Applications)
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Abstract

This study focuses on the PS8 well in the Penglai Gas Field (Sichuan Basin), a newly identified key exploration area, where high-yield gas testing has been achieved from the Ediacaran Fourth Member of the Dengying Formation. Comprehensive analyses of drilling cores, cuttings, thin sections, analytical data, well logging, and production testing data were conducted to investigate the main characteristics of the gas reservoir and the factors controlling the formation model of the reservoir. The results reveal that the reservoir rocks in the Fourth Member of the Dengying Formation are primarily algal-clotted dolomite, algal-laminated dolomite, and arenaceous dolomite. The reservoir porosity is dominated by secondary pores, such as algal-bonded framework pores, intergranular dissolved pores, and intercrystalline dissolved pores, which contribute to the overall low porosity and extremely low permeability. The gas reservoir is classified as a unified structural–lithological reservoir, with the upper sub-member of the Fourth Member serving as a completely gas-bearing unit. This unit is characterized as an ultra-deep, dry gas reservoir with medium sulfur and medium CO2 contents. The development of this gas reservoir follows a “laterally generated and laterally stored, upper generation and lower storage” reservoir formation model. Regional unconformities and fracture systems developed during the Tongwan II Episode tectonic movement provide efficient pathways for hydrocarbon migration and accumulation. The high-quality source rocks in the lower Cambrian Qiongzhusi Formation serve as both the direct cap rock and lateral seal of the gas reservoir, creating an optimal source–reservoir spatial configuration. This study provides valuable insights into the giant gas reservoir of the Dengying Formation, which can aid in optimizing exploration activities in the Sichuan Basin.
Keywords: Ediacaran Dengying Formation; gas reservoir; reservoir formation model; porosity and permeability; dolomite reservoirs; central Sichuan uplift Ediacaran Dengying Formation; gas reservoir; reservoir formation model; porosity and permeability; dolomite reservoirs; central Sichuan uplift
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MDPI and ACS Style

Chen, H.; Wang, S.; Mansour, A.; Qin, Q.; Ahmed, M.S.; Cen, Y.; Liang, F.; He, Y.; Fan, Y.; Gentzis, T. Key Characteristics and Controlling Factors of the Gas Reservoir in the Fourth Member of the Ediacaran Dengying Formation in the Penglai Gas Field, Sichuan Basin. Minerals 2025, 15, 98. https://doi.org/10.3390/min15020098

AMA Style

Chen H, Wang S, Mansour A, Qin Q, Ahmed MS, Cen Y, Liang F, He Y, Fan Y, Gentzis T. Key Characteristics and Controlling Factors of the Gas Reservoir in the Fourth Member of the Ediacaran Dengying Formation in the Penglai Gas Field, Sichuan Basin. Minerals. 2025; 15(2):98. https://doi.org/10.3390/min15020098

Chicago/Turabian Style

Chen, Hongwei, Shilin Wang, Ahmed Mansour, Qirong Qin, Mohamed S. Ahmed, Yongjing Cen, Feng Liang, Yuan He, Yi Fan, and Thomas Gentzis. 2025. "Key Characteristics and Controlling Factors of the Gas Reservoir in the Fourth Member of the Ediacaran Dengying Formation in the Penglai Gas Field, Sichuan Basin" Minerals 15, no. 2: 98. https://doi.org/10.3390/min15020098

APA Style

Chen, H., Wang, S., Mansour, A., Qin, Q., Ahmed, M. S., Cen, Y., Liang, F., He, Y., Fan, Y., & Gentzis, T. (2025). Key Characteristics and Controlling Factors of the Gas Reservoir in the Fourth Member of the Ediacaran Dengying Formation in the Penglai Gas Field, Sichuan Basin. Minerals, 15(2), 98. https://doi.org/10.3390/min15020098

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