There are a lot of rock properties that affecting the quality of production operation from the reservoir, the most important one is the electrical resistivity of the rocks. The determination of the electrical properties of the rocks is the key factor for the calculation of cementation factor (m) and touristy factor (a). This study shows the relationship between the porosity and the composition coefficient by drawing the relationship on a logarithmic sheet to find the cement coefficient (m). The information obtained from the well records of a number of oil wells is used to calculate the size of hydrocarbons and the degree of water saturation of carbonate reservoirs. The degree of saturation of hydrocarbons for carbonate rocks usually ranges from 43% to 99%. The importance of studying cement and its role in the engineering of oil reservoirs and their physical properties (permeability, porosity, degree of saturation, properties of capillaries, etc.) in determining the specifications of geological layers and their hydrocarbon materials. The difference in the cementation exponent calculated from these two forms of Archie’s law is important, and can lead to a misestimating of reserves by at least 20% for typical reservoir parameter values. The results show a difference between Archi constants and calculated constants as result of that Archi figure out these values from pure rocks where as in actual there is a lot of impurities in the rocks, so this is why there is error in calculations and that what we are going to improve it.