Influence of organic matter and mineral composition on carbonate source rock wettability: Implications for CO2 geostorage

作者：Muhammad Usman, Nurudeen Yekeen, Muhammad Ali, Mujahid Ali, Alireza Keshavarz, Stefan Iglauer, Volker Vahrenkamp · 发表于：Fuel · 年份：2025 · DOI：10.1016/j.fuel.2025.135666 · 被引用次数：19 · 研究领域：CO2 Sequestration and Geologic Interactions、Hydrocarbon exploration and reservoir analysis、Hydraulic Fracturing and Reservoir Analysis

• Organic matter influences the wettability of carbonate source rocks in CO 2 /brine systems. • Mineralogical composition affects wettability in both the presence and absence of organic matter. • Organic matter removal shifts wettability from CO 2 -wet to water-wet conditions. • Wettability changes are observed with increased pressure, modulated by rock mineralogy. • CO 2 storage capacity increases after organic matter removal, with notable effects on CO 2 column height. Wettability is critical in determining carbon dioxide (CO 2 ) behavior during geological sequestration in unconventional reservoirs. Unconventional reservoirs are compositionally heterogeneous, affecting CO 2 plume migration, containment security, and storage capacity during geological sequestration. Previous studies on CO 2 storage in unconventional reservoirs have primarily attributed to changes in organic matter content; however, this study examines how variations in the mineralogical and organic matter content combined affect wettability in CO 2 /brine systems under subsurface conditions. Three samples with varied mineralogy and TOC content were selected from a well drilled in Jordan source rocks—an immature analog of marine-derived, carbonate-dominated, Type IIS source rocks. Samples were analyzed using RockEval pyrolysis, X-ray diffraction, X-ray fluorescence, and Thermogravimetric analysis to characterize their organic and inorganic compositions. Samples were pyrolyzed at 600 °C to remove Volatile Orga...