Thesis Supervisor : Asst. Prof. Dr. İ. Metin MIHÇAKAN İSTANBUL TECHNICAL UNIVERSITY  INSTITUTE OF SCIENCE AND TECHNOLOGY M.Sc. Thesis by Cansın BAYCAN Department : Petroleum and Natural Gas Engineering Programme : Petroleum and Natural Gas Engineering JUNE 2011 RESERVOIR QUALITY CONTROLLING FACTORS, DELIVERABILITY AND RESERVE ESTIMATES IN DELTAIC DANİŞMEN AND OSMANCIK FORMATIONS AT İKİHÖYÜK GAS FIELD, THRACE BASIN, TURKEY