All the well logging reinterpretation by using the new softwares, cores analysis and results of seismic 2D and 3D surveys allowed to identify the reservoir characteristics of Kurachina Dolomite Formation of middle Triassic, for two zones (C2, D1) in Jihar field and its affect on hydrocarbon potential in this area. It's found that C2 reservoir consist mostly of dolomite and small amount of shale and anhydrite, fractured and all the fractures are full of organic materials, calcite, anhydrite, silica and little amount of stilolite, while there is succession of limestone and fossil remains, in some places there is shally dolomite. Whereas D1 reservoir is mostly crystalline limestone and the fractures filled with dolomite.