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طباقية التتابع والخواص المكمنية لتتابعات الباليوجين المتاخر النيوجين المبكر في - منطقة كركوك == SEQUENCE STRATIGRAPHY AND RESERVOIR CHARACTERIZATION OF THE LATE PALAEOGENE - EARLY NEOGENE SUCCESSION IN KIRKUK AREA
Author name:
ياسين صالح كريم الجويني
Supervisor name:
عمي داود كيارة
General topic:
Geology
Specific topic:
Geology
Degree:
Doctorate
University:
University Of Kirkuk - College Of Science
Language:
English
University location:
Kirkuk
First pages:
30T348 - p.pdf
Abstract:
The Late Palaeogene - Early Neogene succession of Kirkuk, Bai Hassan and Khabaz oil fields include the Jaddal, Palani, Sheikh Alas, Shurau, Tarjil, Baba, Bajwan, Ibrahim, Azkand, Anah and Jeribe formations.Palaeoenvironment interpretation of the analyzed microfacies identified nine major environmental zones. They range from Supratidal to deep basinal. The setting was rimmed shelf with barrier reef during the Oligocene and a distally steepened ramp during the early Miocene. The studied succession was affected by various diagenetic processes.Eight types of porosities were identified depending on petrographic study, they include interparticle, intraparticle, intercrystalline, fracture, channel, moldic, vug and cavern porosities. The Jaddala, Palani, Tarjil and Ibrahim formations have low porosities whereas the higher porosities were present in Sheikh Alas, Shurau, Baba, Bajwan, Azkand, Anah and Jeribe formations.The Late Palaeogene - Early Neogene succession represents one 2nd order cycle, bounded below by a transgressive surface (TS) and above by a type 1 sequence boundary (SB1). Five 3rd order cycles can be identified within the highstand systems tract of the 2nd order cycle, they reflect the effect of local subsidence on sequence development.The first stage of basin development was the deposition of the basinal Jaddala (late Eocene) and the basinal Palani (early Oligocene) all over the area. The second stage was represented by a regression due to the uplifting of Kirkuk oil Field where deposition of fore reef - reef of Sheikh Alas and backreef of the Shurau took place, this was ended by uplifiting to the northwest. The next transgression covered Khabaz oil Field and Daoud dome of Bai Hassan during the late Oligocene as well as the Tarjil plunge hence the basinal facies of Tarjil was deposited and the fore reef - reef Baba and backreef Bajwan deposited on the Baba and Kithka domes. The third stage was characterized by uplifting of both Kirkuk and Bai Hassan and the water in the study area was covered the Khabaz oil Field where the basinal facies of Ibrahim Formation was deposited in Khabaz oil Field only during the early Miocene followed by falling with sea level and deposition of the fore reef - reef Azkand. The shallow facies of Anah Formation represent the end of this stage. It was followed by another transgression covering only Bai Hassan and Khabaz where the Jeribe Formation was deposited during the early middle Miocene.Four reservoir units in Kirkuk oil Field, and three reservoir units in both Bai Hassan and Khabaz oil fields were identified. These reservoir units include the Jeribe, Anah and Azkand formations in Khabaz oil Field; Bajwan, Baba, Shurau and Sheikh Alas formations in Kirkuk oil Field; and Jeribe, Bajwan, Baba formations in Bai Hassan oil Field.
