Vug is a cavity in a rock.

Hydrothermal quartz vug from the Mid-Atlantic Ridge
Discrete Fracture-Vug Network Model for Modeling Fluid Flow in Fractured Vuggy Porous Media
3D modeling of Ordovician fractured-vug carbonate reservoir, Tahe Oilfield
Mathematical model of fluid flow in fractured vuggy reservoirs based on discrete fracture-vug network
Models and Methods for Determining Transport Properties of Touching-Vug Carbonates
Vug brines- fluid inclusions: a key to the understanding of secondary gold enrichment processes and the evolution of deep brines in ...
The characteristics of Lower Ordovician fissure-vug carbonate oil and gas pools in Tahe oil field, Xinjiang
Ordovician Carbonate Fractured-vuggy Reservoir in Tahe Oilfield, Tarim Basin: Characteristics and Subdivision of Fracture-Vug Units
Variability of petroleum inclusions in vein, fossil and vug cements—a geochemical study in the Barrandian Basin (Lower Palaeozoic, ...
Investigation of well logging evaluation and identification methods for carbonate reservoirs with fracture and vug in Tahe oil field