Oil and gas reservoir is a geological rock containing voids of such porosity and permeability properties that identify its capability to contain fluids and ensure their mobility. The reservoir thickness, homogeneity of area and the degree of variation in depth and by area can be referred to as the most important field properties of the reservoir. Identification of reservoirs is done by a set of geophysical studies of a well and an evaluation of laboratory data against all geological information of the field.