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Source Rock Evaluation and 1-D Basin Modelling Approach for the Sargelu Formation, Atrush-2 Well, Kurdistan Region-Iraq

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Open j.urnal of Geology 2021年第3期11卷 49-60页

作者： Revan Akram Ayad N. F. Edilbi wrya j. mamaseni Govand H. Sherwani Nadhir Al-Ansari Department of Petroleum Technology Erbil Polytechnic University Kurdistan Region Iraq Department of Petroleum Geosciences Faculty of Science Soran University Kurdistan Region Iraq Department of Geology Salahaddin University Erbil Kurdistan Region Iraq Department of Civil Engineering Cihan University-Erbil Erbil Kurdistan Region Iraq Lulea University of Technology Lulea Sweden

The present study focuses on source rock evaluation of the Sargelu Formation by using core chips of rocks collected from well Atrush-2, Duhok, Kurdistan Region-Iraq. The Rock-Eval pyrolysis and vitrinite reflectance were executed. Subsequently, the selected parameters were used for source rock evaluation and 1-D Basin Modelling calibration. The upper part of the formation mainly comprises argillaceous limestone with low content of organic matter (0.64% - 1% TOC). By contrast, the lower part is dominated with shale interval and contains high amounts of TOC values (>4% for 1272 - 1278 m) reveling good to very good quality source rock. Accordingly, good to very good hydrocarbon generation potential is suggested for this formation. Organic matter of the Sargelu Formation contains type II and mixed-type II-III kerogen. The values of Tmax and vitrinite reflectance (Ro%) demonstrate that the formation is thermally mature and in the oil zone. In order to construct a thermal history of the formation and determine the timing of hydrocarbon maturation and generation, the 1-D basin modelling PetroMod 2019.1 was used in this study. Based on the 1-D Basin modelling simulation and its outputs, about 3500 m of overburden have been eroded at the study area. The present-day heat flow was found to be 30 mW/m2. The organic matter of Sargelu Formation entered the early oil zone in 64 Ma and reached the main oil zone ca. 5 Ma. The formation is still in the main oil zone at present-day. In well Atrush-2, the highest rate of oil generation for the Sargelu Formation was in the 8.5 Ma, the onset of oil expulsion from Sargelu Formation was in 50 Ma and the expulsion mass has been reached 0.5 Mtons at present-day.

关键词： Sargelu Formation Source Rock Well Atrush-2 1-D Basin Modelling Iraq

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Reservoir Characterization of the Early Cretaceous Sarmord and Garagu Formations from Atrush-1 and Mangesh-1 Wells, Kurdistan Region, Iraq

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Open j.urnal of Geology 2021年第10期11卷 509-524页

作者： Ayad N. F. Edilbi wrya j. mamaseni Mahdi Kh. Aswad Bahroz Gh. Abdullah Falah Kh. Al-j.boury Govand H. Sherwani Nadhir Al-Ansari Department of Petroleum Geosciences Faculty of Science Soran University Soran Kurdistan Region Iraq Geology Department College of Science Salahaddin University Erbil Kurdistan Region Iraq Geology Department College of Science University of Duhok Duhok Kurdistan Region Iraq Department of Petroleum Engineering College of Engineering American University of Kurdistan Sulaimaniya Kurdistan Region Iraq Petroleum Engineering Department Knowledge University Erbil Kurdistan Region Iraq Department of Civil Engineering Cihan University-Erbil Erbil Kurdistan Region Iraq Lulea 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 j.st 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.

关键词： Sarmord Formation Garagu Formation Reservoir Characterization Hydrocarbons Saturation Net Pay

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