Author(s)

Ayad N. F. Edilbi¹, Wrya J. Mamaseni², Mahdi Kh. Aswad², Bahroz Gh. Abdullah^3,4, Falah Kh. Al-Jaboury⁵, Govand H. Sherwani⁶, Nadhir Al-Ansari^7*

¹Department of Petroleum Geosciences, Faculty of Science, Soran University, Soran, Kurdistan Region, Iraq.
²Geology Department, College of Science, Salahaddin University, Erbil, Kurdistan Region, Iraq.
³Geology Department, College of Science, University of Duhok, Duhok, Kurdistan Region, Iraq.
⁴Department of Petroleum Engineering, College of Engineering, American University of Kurdistan, Sulaimaniya, Kurdistan Region, Iraq.
⁵Petroleum Engineering Department, Knowledge University, Erbil, Kurdistan Region, Iraq.
⁶Department of Civil Engineering, Cihan University-Erbil, Erbil, Kurdistan Region, Iraq.
⁷Lulea University of Technology, Lulea, Sweden.

Petrophysical properties of the Early Cretaceous Sarmord and Garagu formations from the Atrush and Sarsang Blocks in the Kurdistan Region are studied. These formations are generally composed of limestones and dolomitic limestones interbedded with thin to medium layers of yellowish-gray marl (calcareous mudstone). The current study shows that the average shale volume in the Sarmord and Garage formations is between 16% and 20%. In Atrush-1 Well, the average porosity ratio of the Sarmord and Garagu formations is fair to good (15% and 11%, respectively). However, in Mangesh-1 Well, the porosity value is poor; it is around 4% on average. Generally, most of the hydrocarbons that have been observed within the pore spaces are residual oil type in Atrush-1 Well and movable hydrocarbon type in Mangesh-1 Well. In Atrush-1 Well, out of 362 m thickness of both formations, only 180 m is considered to be a pay zone; whereas, the pay zone is just around 8.0 m thick out of 347 m of the total thickness. According to the calculated porosity values, the Garagu and Sarmord formations are not considered as good reservoirs in the studied wells, with the exception of Atrush-1 Well where the Sarmord Formation has fair potential reservoir characteristics.

Sarmord Formation, Garagu Formation, Reservoir Characterization, Hydrocarbons Saturation, Net Pay

Edilbi, A. , Mamaseni, W. , Aswad, M. , Abdullah, B. , Al-Jaboury, F. , Sherwani, G. and Al-Ansari, N. (2021) Reservoir Characterization of the Early Cretaceous Sarmord and Garagu Formations from Atrush-1 and Mangesh-1 Wells, Kurdistan Region, Iraq. Open Journal of Geology, 11, 509-524. doi: 10.4236/ojg.2021.1110027.