considering the importance of temperature and time factors in maturation and conversion the organic materials ,and the facts, that the sum of the effects of these factors is effected by the sedimentary burial history and changes with the changing of the kerogen types,and for consummation the aim of this study in isolating the Siluric and upper Paleozoic rock formations in which temperature and time had allowed to their included organic material to realise its potential in conversion to hydrocarbonic materials, paleotictonic and geotemperature diagrams for these formations were drawn depending on real data from 12 selected drilled wells in the study area, then the values of timetemperature Arrhenius index and the percent of the realised potential in conversion to hydrocarbonic materials were calculated for each main kerogen type (Ia,b,c, II,a,b,c,d, III) which may undergo to the same time-temperature history of the studied formations.