Through coring engineers, geologists and petro physicists gain access to accurate and representative reservoir information to enhance the geological and petro physical models. Coring can be conducted by various methods with a variety of tools in a wide range of hole sizes. Laboratory measurements performed on core samples recovered from hydrocarbon reservoirs provide reservoir properties and descriptive data not available from any other source. While well logs play a very important role in reservoir characterization, core material is needed to add a high degree of certainty in calibrating the data obtained from these tools.