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Study on Stratigraphy, Structural Geology and Hydrocarbon Potentials of the Cretaceous Strata, Northeastern Iraq

이라크 북동부 지역 백악기 퇴적층의 층서, 구조지질 및 탄화수소 부존 유망성 연구

  • Lee, Taecheol (Exploration Division, Korea National Oil Corporation) ;
  • Han, Seungwoo (Department of Geology, Kyungpook National University) ;
  • Ryu, In-Chang (Department of Geology, Kyungpook National University)
  • Received : 2014.08.05
  • Accepted : 2014.08.31
  • Published : 2014.08.28

Abstract

Seismic reflection data are integrated with fieldwork data in order to understand startigraphy, structural geology and hydrocarbon potentials of Cretaceous strata in the Mesopotamian basin, Northeastern Iraq. Cretaceous strata in the basin divided into the Qamchuqa, Kometan, Bekhme and Shiranish formations, which are composed of carbonates deposited in shallow marine environment. The geological structures in these formations are mainly recognized as thrusts, detachment folds, fault propagation folds and fault bend folds. As well, NW-SE trending fractures are regularly developed, and are horizontal or perpendicular to the structures. The distribution and frequency of fractures are related to the development of the thrusts. In terms of hydrocarbon potentials, Cretaceous strata in the basin have limited capacities for source rocks and seal rocks due to the lack of organic carbon content and the well-developed fractures, respectively. Although these carbonates have limited primary porosity, however, development of the secondary porosity derived from the fractures contributes to enhance the reservoir quality. Most important factor for the reservoir quality of Cretaceous strata seems to be the frequency and connectivity of fractures relative to locations of folds and faults. The results delineated in this study will use as reference for recognizing stratigraphy and structures of Cretaceous strata and will provide useful information on hydrocarbon potentials of Cretaceous strata in the Mesopotamian basin, NE Iraq.

Keywords

stratigraphy;structural geology;hydrocarbon potentials;Cretaceous strata;NE Iraq

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