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Comparative Investigations on Wettability of Typical Marine, Continental, and Transitional Shales in the Middle Yangtze Platform (China)
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-11-13 00:00:00 , DOI: 10.1021/acs.energyfuels.8b02805 Rui Yang 1 , Sheng He 1 , Qinhong Hu 2 , Gangyi Zhai 3 , Jizheng Yi 4 , Li Zhang 4
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-11-13 00:00:00 , DOI: 10.1021/acs.energyfuels.8b02805 Rui Yang 1 , Sheng He 1 , Qinhong Hu 2 , Gangyi Zhai 3 , Jizheng Yi 4 , Li Zhang 4
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Wettability is a physico-chemical rock property that plays a crucial role in the efficient development of shale gas and oil. However, a precise characterization of wettability for shale reservoirs is still a challenging task because of their complex pore structure (with a large proportion of pores in nm scale) and shale composition (variable at μm scale). In this work, we conducted the fluid drop wettability test, air–liquid contact angle measurement, and spontaneous imbibition (SI) with two fluids [deionized (DI) water and n-decane (an oil phase)] to evaluate the wettability of typical organic-rich shales (marine Longmaxi, continental Dongyuemiao, and transitional Dalong and Longtan shales), as influenced by total organic carbon (TOC), thermal maturity, mineral composition, effective porosity, and pore size distribution. Marine Longmaxi shales have strong or moderately strong water-wet properties with measured DI water contact angles of 3.4°–16.5°. In contrast, continental Dongyuemiao and transitional Dalong–Longtan shales show a much stronger water-repellant property with contact angles in the ranges of 21.2°–46.4° and 57.8°–61.7°, respectively. N-decane spreads quickly on the flat sample surfaces to generate zero contact angles, indicating that all these shales are strongly oil-wet. This is consistent with the much larger imbibition slopes of n-decane in the plot of log dimensionless weight (WD) versus log dimensionless time (tD) than DI water. Shale samples with the higher TOC content, higher quartz content, and lower clay content have a stronger water-repellant property in marine Longmaxi and continental Dongyuemiao shales. In contrast, relationships between DI water contact angles and quartz content and clay content are not obvious in transitional shales. With thermal maturities increasing from mature to high-mature and overmature, wetting affinity to DI water tends to alter, which needs more comprehensive investigations in the future. Effective porosity has a positive effect on DI water contact angles for argillaceous limestones in continental Dongyuemaio, siliceous shales in marine Longmaxi, and transitional shales, whereas it has a negative effect in the silty shales from continental Dongyuemiao and argillaceous siliceous shales from marine Longmaxi.
更新日期：2018-11-13
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