Evaluation of hydrocarbon potential of the organic-rich black shales in the Shemshak Formation, Central & Eastern Alborz, northern Iran

Category Petroleum Geology
Group GSI.IR
Location The 25 Symposium of Geosciences
Author A. Shekarifard,k. Seyed-Emami, F. Baudi
Holding Date 03 July 2007

 

Abstract :

In this study the black shale facies of the Shemshak Formation has been classified into two groups including (۱)Basal black shales (BBS) and (۲)Highly carbonaceous shales (HCS) in the Central and Eastern۱:placename> Alborz۱:placename> Range۱:placetype>۱:place>. The BBS unit in the lower part of Shemshak Formation at Tazareh, Parvar and Paland sections have been well exposed. Residual organic carbon in the this unit range from ۰.۳ to ۳.۵ wt.% (۰.۹ wt.% on average). Amorphous organic matter (AOM) dominates and mainly derived from degradation of the planktonic remains. According to geochemical and palynological investigations the BBS unit is overmature (Tmax=۵۶۱ ºC) and contains altered type II kerogen. The BBS unit may have initially been a good source rock for generation of hydrocarbons, but is now an inactive effective source rock. The carbonaceous shales are early mature to overmature where sampled. The organic carbon content is between ۳.۳ and ۲۹.۴ wt.% (with a mean ۱۴.۲ wt.%). The maximum HI value (۲۴۸ mg HC/ g TOC) comes from the HCS sediments. This unit contains a mixture of type II, III, IV kerogens (AOM, Exinite and Vitrinite macerals) in the studied samples

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