Abstract: This study includes examination and evaluation of Karababa C Formation`s reservoir caharacteristics, porosity andhydrocarbon saturation values which is one of the reservoir rocks of Adıyaman region by using geostatisticalsimulation methods. The data which were obtained from the 11 drillholes drilled in the study area were evaluated bydetermining the parameters geostatistically. By using geostatistical simulation softwares three dimensional evaluationof the study area was done and variogram functions were calculated. Variogram s which were obtained from porosityand hydrocarbon saturation values were modelled spherically, model parameters with C0=0.0003,C=0.0020, a=400for porosity values and CO=O.OJ, C=0.04, a=450 for hydrocarbon values were determined. The suitability of modelparameters were validated with back-kriging technique.The study area was seperated in blocks for x direction 300x10 m, for y direction 120 xlO m and for z direction15x10 m and evaluated conditional simulation was done by using "annealing simulation method". 40 different results which were obtained from simulation the simulation result giving the best senario which means to he compatible ofexistance production area and covers the most wide area is examinated. Some statistical parameters such as mean,varince, histogram and variogram were calculated and evaluated of 540000 simulated data values which wereobtained for porosity and hydrocarbon saturation. Simulation results were evaluated on cross-sections which isdetermined x,y,z directions and the best areas where petroleum production could be done were detennined.