Paper Information

Journal:   PETROLEUM RESEARCH   WINTER 2016 , Volume 25 , Number 85-2; Page(s) 145 To 159.
 
Paper: 

GEOCHEMICAL ASSESSMENT OF EARLY CRETACEOUS GARAU FORMATION IN ANJIR AND KABIR KUH ANTICLINES OF LURESTAN ZONE, NORTHWEST OF ZAGROS, IRAN

 
 
Author(s):  MAHBOBIPOUR HOJJAT, KAMALI MOHAMMAD REZA*, SOLGI ALI
 
* FACULTY OF RESEARCH AND DEVELOPMENT IN UPSTREAM PETROLEUM INDUSTRY RIPI, TEHRAN, IRAN
 
Abstract: 

Deposition of organic rich black shales and argillaceous limestones in the Berriasian-Turonian interval have been documented from different parts of the world. The Early Cretaceous Garau Formation, based on geological and geochemical reports is well exposed in northwest of Zagros, Iran (Lurestan Zone) as a hydrocarbon source rock. However, these reports lack comprehensive results of experimental analysis and studies. In this study, samples from Garau Formation obtained from Anjir anticline (n=12 cuttings from well ANR-1) and Kabir Kuh anticline (n=5 cuttings from well KAK-1 and 11 outcrop samples from Tange Garau) from Lurestan Zone were subjected to Rock-Eval pyrolysis, Gas Chromatography (GC), Gas Chromatography-Mass-Spectrometry (GC-MS) and vitrinite reflectance measurement (Ro%) techniques. Analytical results show that average values for TOC (1.75 and 2.55%), Tmax (445 and 475oC) and Ro (0.895 and 0.974%) in these two anticlines respectively, suggesting good to very good hydrocarbon source rock with late oil window and early gas generation maturity. Most samples have a mixture of kerogen types II/III and type III. Biomarker characteristics including normal alkanes, distribution of the hopanes and steranes indicated the presence of dominant marine organic matter with a minor terrestrial organic input that were deposited in a marine environment under reducing conditions. The results obtained from characteristic biomarkers also suggest that the Garau Formation is thermally mature in the above mentioned two anticlines which are in agreement with the results of Rock-Eval pyrolysis and vitrinite reflectance measurements.

 
Keyword(s): SOURCE ROCK, GARAU FORMATION, BIOMARKER, ORGANIC GEOCHEMISTRY, LURESTAN ZONE
 
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