Two properties are necessary for fluid movement of reservoir rocks and source rocks: permeability and porosity. It is made up of voids or pores, the ability to hold fluids (known as porosity) and the pores are interconnected (permeability) to allow flow. Hydrocarbons can be defined as reservoir fluids. The volume of hydrocarbons stored in a reservoir depends on the porosity of the reservoir rock. The speed and volume with which hydrocarbons are withdrawn depend on the permeability of the reservoir rock. The almost complete pore space of the upper several kilometers of the Earth's crust contains water. Therefore in this aquatic environment there are hydrocarbons with amalgam of oil, gas and water occurring in different proportions. The two dominant physical properties of oil and gas that enhance their movement through subterranean substance are their relative immiscibility in water and their lower density than water which causes their buoyancy. The buoyancy of hydrocarbons occurs due to differences in the density of their respective fluids while passage through the oil and gas reservoir is a stimulus that creates differential pressures that exist in the reservoir bed. The basic properties of rocks can be classified as follows:SkeletalThe "skeleton" "Reservoir rock structures are influenced by the depositional environment and numerous terrestrial processes after deposition. DynamicThis is related to the mixing of fluids and reservoir rocks Skeletal properties of interest to reservoir engineers include porosity, pore size distribution, compressibility, and absolute permeability of the bar. The interaction or dynamic properties of reservoir rocks are influenced by nature and its interaction with the fluids present, as...... half of the paper ......a producing well is significantly less than in other areas where there is no drilled well could be natural or created by design engineering that involves the injection of fluids through certain wells positioned optimally to obtain the best results. Experimental data suggest that reservoir rocks are abundantly permeable in both vertical and horizontal directions. Among a myriad of factors related to geological and geochemical processes, the permeability of a rock is influenced by fissure, shape, configuration and connectivity or a porous network. The Darcy Equation and Its Application Darcy's law provides an accurate description of groundwater flow in almost all hydrogeological environments. Henri Darcy established empirically that the flow of water through a permeable formation is proportional to the distance between the top and bottom of the soil column.