Abstract
AbstractThe Late Jurassic Naokelekan and Barsarin formations of northwestern Iraq have been investigated in three wells to assess their potentiality for hydrocarbon generation.The results of Total Organic Carbon content (TOC) and Rock-Eval Pyrolysis reveal fair to excellent content of hydrocarbon and suggest that the depositional conditions were suitable for the production and preservation of organic matter. The Thermal Maturity Proxy indicates that the studied formations were mature stage of hydrocarbon generation, with an exception of three samples from the Naokelekan Formation in Shaikhan-8 well, and two samples from the Barsarin Formation in Atrush-1 and Shaikhan-8 wells were at an immature stage.The S1and TOC relationship shows that all the samples are indigenous in nature. Most of samples from the Naokelekan Formation belong to kerogen Type II/III, and that in the Barsarin Formation belongs to kerogen Type II is dominant.The Pr/Ph, Pr/n-C17and Ph/n-C18ratios for the extracted bitumen of both the formations indicate that they were originated from marine organic matter under reducing conditions. Theδ13CSatandδ13CArorange from −28.7 to −27.7‰ and −28.8 to −27.7‰ respectively. These biomarkers show high contribution of marine organic matters preserved under relatively anoxic conditions in the studied formations.
Highlights
The Late Jurassic Naokelekan and Barsarin formations of northwestern Iraq have been investigated in three wells to assess their potentiality for hydrocarbon generation
The results of Total Organic Carbon content (TOC) and Rock-Eval Pyrolysis reveal fair to excellent content of hydrocarbon and suggest that the depositional conditions were suitable for the production and preservation of organic matter
The Thermal Maturity Proxy indicates that the studied formations were mature stage of hydrocarbon generation, with an exception of three samples from the Naokelekan Formation in Shaikhan-8 well, and two samples from the Barsarin Formation in Atrush-1 and Shaikhan-8 wells were at an immature stage
Summary
Abstract: The Late Jurassic Naokelekan and Barsarin formations of northwestern Iraq have been investigated in three wells to assess their potentiality for hydrocarbon generation. The Upper Callovian-Lower Oxfordian, with Kimeridgian and Oxfordian ages were suggested for Naokelekan and Barsarin source rocks in North Iraq respectively [8] This was based on the study of Palynomorphs, mainly dinoflagellate cysts. The area of the High Folded Zone of Iraq including, Balambo-Tanjero and Northern Thrust Zones is characterized by condensed sedimentary successions of euxinic environment in the lower part (Naokelekan Formation), and lagoonal evaporites in the upper part (Barsarin Formation). This in turn led [12] to confer the presence of a tectonic ridge separating the basin in northern Iraq. The margins of the basin were probably controlled by a system of conjugate NW-SE and SW-NE trending lineaments [2]
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