--> Abstract: Genetic Classification of the SE Turkey Crude Oils and Delineation of the Source Rock Types with the Use of Biological Markers, by K. Gurgey; #91012 (1992).

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ABSTRACT: Genetic Classification of the SE Turkey Crude Oils and Delineation of the Source Rock Types with the Use of Biological Markers

GURGEY, KADIR, TPAO Research Center, Ankara, Turkey

API gravity, sulfur content, and stable carbon isotope ratio measurements, thin-layer chromatography, gas chromatography, and gas chromatography-mass spectrometry analyses were carried out on the 44 crude oil samples from unknown source rocks in southeastern Turkey. The pertinent data were evaluated using conventional as well as sophisticated multivariate factor analysis.

The Turkish oils were classified into four major groups and a mixed group of two of them after considering the effects of thermal alteration, bacterial degradation, and secondary migration on the oil

compositions. Determination of depositional environment, lithology, age, organic matter type, and maturity of the possible source rocks were undertaken by using specific biomarkers in the oils provided to select three major possible source rock candidates and to predict migration pathways. The integration of the geochemical and geological data indicates that the siliciclastic Upper Silurian Dadas formation, the calcareous Campanian Karabogaz Formation, and the evaporitic/calcareous Triassic-Jurassic Cudi Group have possibly generated the oils already discovered in southeastern Turkey.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)