👉 Fluid in rocks, often referred to as pore fluids, consists of water, oil, and gas trapped within the spaces between mineral grains in sedimentary rocks or within the pores of igneous and metamorphic rocks. These fluids can significantly affect the rock's physical properties and behavior, such as its strength, permeability, and porosity. They are crucial in various geological processes including hydrocarbon migration, mineral deposition, and the alteration of rock compositions. The movement and composition of these fluids are influenced by factors like temperature, pressure, and the chemical environment, and understanding them is essential for fields such as petroleum geology, hydrogeology, and environmental science.