The amount of total organic matter in asphaltites is high as would be expected, ranging from 12 to 73%. In contrast, this amount is low in the host rocks (0.6–6.3%). The Tmax values are generally between 428 °C and 451 °C. The hydrogen index (HI) values vary between 270 and 541 mg HC/g TOC. The hydrogen index values and Tmax values of the host rocks are significantly lower. The GC analyses have shown that the saturated fractions of all asphaltite samples were not biodegraded. Consequently, organic geochemical parameters such as Hopane/Hopane+Moretane, Ts /Tm, 22S/22S+22R and the values of %C27, %C28, %C29 steranes obtained as a result of GC-MS analysis were used for maturity assessments.
Although the organic geochemical parameters provided some data for the origin and placing mechanism, it is concluded that they are not sufficient for an overall conclusion, especially concerning placing mechanism. Therefore, new studies particularly on local and regional geological aspects need to be undertaken.
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