Diagenesis of the Low-permeability Reservoir in the Huagang Formation of the Xihu Depression and the Genesis of High-quality Reservoirs

doi:10.11885/j.issn.1674-5086.2025.01.15.03

Abstract

Abstract: The porosity and permeability of the sand bodies in the Xihu Depression's Huagang Formation are generally poor, while locally developed high-quality reservoirs are often the key to hydrocarbon accumulation. Based on core, thin section data, electron probe, and analytical testing data, the reservoir characteristics and their main controlling factors were analyzed, and a development model for high-quality reservoirs was established. The results show that the H3 Member in the study area mainly develops ultra-low permeability reservoirs, low-permeability reservoirs, and high-permeability reservoirs, with intergranular dissolution pores being the main pore type of the high-quality reservoirs. The sandstone reservoir diagenesis includes compaction, cementation (quartz, carbonate, clay), and dissolution. During the evolution process, the reservoir has experienced acidic modification by meteoric water and hydrocarbon charging. It was found that the source and strong hydrodynamic depositional facies are favorable conditions for the development of high-quality reservoirs. Early carbonate cementation and late hydrocarbon charging modification are the keys to the protection of primary pores and the generation of secondary pores in high-quality reservoirs. The coupling of sedimentary, diagenetic, and tectonic actions in time and space controls the formation of high-quality reservoirs.

Key words: tight sandstone, diagenesis, reservoir development model, Huagang Formation, Xihu Depression

CLC Number:

TE121

YIN Wenbin, ZHAO Xiaoming, GE Jiawang, LIANG Yueli, WANG Jianwei. Diagenesis of the Low-permeability Reservoir in the Huagang Formation of the Xihu Depression and the Genesis of High-quality Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(2): 17-34.

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