Organic geochemical evaluation and thermal burial history of the Jaddala Formation (Eocene) in Qumar Oil Field, NE, Iraq
- PDF / 3,673,224 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 27 Downloads / 210 Views
ORIGINAL PAPER
Organic geochemical evaluation and thermal burial history of the Jaddala Formation (Eocene) in Qumar Oil Field, NE, Iraq Dler H. Baban
Received: 31 January 2014 / Accepted: 2 April 2014 # Saudi Society for Geosciences 2014
Abstract The Eocene Jaddala Formation has been studied from source rock potentiality point of view in the well Qm1, Qumar Oil Field, NE, Iraq. An average of about 2.4 % total organic carbon was measured from the five analyzed samples in this study. The lower part of the formation showed higher organic matter content and represented a deeper depositional environment than the upper part. The quality of the organic matter appeared to be mainly types II with contribution from type III with different ratios. The pyrolysis analysis, vitrinite reflectance technique, and gas chromatography (GC) analysis all indicated the immature state of the Jaddala Formation in the studied section. The thermal history of the formation showed that Jaddala never entered the maturity stage during its burial history. Keywords Jaddala . Pyrolysis . Source rock . Gas chromatography
Introduction The petroleum geology studies in Iraq generally consider an absence of a Tertiary Petroleum System due to the lack of potential source rocks younger than Cretaceous age in the Iraqi geological column. During the last few years, attempts have been done to evaluate beds of lower Tertiary age, having source rock properties regarding their depositional environments and lithologies, and, for being sure about their actual hydrocarbon potentiality, also to determine the limits of the thermal maturity for the successions in the studied areas. D. H. Baban (*) Department of Geology, Sulaimani University, Sulaimani, Iraq e-mail: [email protected]
Ranyayi (2009) and Baban and Ranyayi (2013) studied the hydrocarbon potentiality of the lower Tertiary beds in north and northeastern Iraq. They found out that the Paleocene Aaliji/Kolosh beds showed maturity and hydrocarbon generation potential in Taq Taq oil field, whereas the beds appeared to be still thermally immature in other locations like Pulkhana, Jambour, and Kor Mor fields. The study of Ranyayi (2009) included the Eocene Jaddala Formation also which appeared containing adequate organic matters in the studied Pulkhana, Jambour, Kor Mor, and Taq Taq fields but with no hydrocarbon generation potential due to the immature state of the formation. Baban (2013) also studied the Aaliji Formation in Qumar Oil Field to evaluate the source potentiality of this basinal formation which generally consists of marl and marly limestone. The optical and analytical methods used in the evaluation showed the maturity of the lower part of the formation but with no great potentiality due to the low total organic carbon content. Al-Ameri et al. (2006, 2011) concluded, during their study about the source of the accumulated oils in the Dyala area (including Qumar Oil Field), that the source is mainly beds belonging to the Jurassic age (Sargelu and Chia Gara Formations). In this study, the Eocene
Data Loading...
