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This research aims to investigate the characteristics and controlling factors of tight sandstone sweet spots.

April 4, 2026Applied SciencesOpen Access

Development Characteristics and Controlling Factors of Deep-Water Deep Tight Sandstone Sweet-Spot Reservoirs in the Baodao Sag, Qiongdongnan Basin

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This research aims to investigate the characteristics and controlling factors of tight sandstone sweet spots.
Analyzed thin sections and SEM data
Evaluated petrophysical properties
Developed a pore evolution model
Identified lithic feldspathic quartz sandstones as dominant reservoirs
Average porosity is 10.92% and permeability is 6.73 × 10−3 μm2
Dissolution increases porosity by an average of 7.20%
Compaction leads to a porosity loss rate of 24.0%
Late carbonate cementation contributes to further densification with a loss rate of 8.28%

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This analysis reveals reservoir properties and sweet spot controls in tight sandstone, suggesting new hydrocarbon exploration strategies.

Zheng et al. (2026) studied this question.

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