Petroleum source rock potential of the Silurian Dadas shales in the Hazro and Korudag regions of Southeast Anatolia, Turkey

作者：Ozturk S S^*; Demirel I H; Gunay Y

来源：Marine and Petroleum Geology, 2016, 75: 53-67.

DOI：10.1016/j.marpetgeo.2016.04.007

• Southeast Anatolia
• Turkey
• Silurian
• Dadas Formation
• Source rock quality
• Thermal maturity
• Illite crystallinity
• Shale oil and gas potential

Shales of the Silurian Oaths Formation exposed in the southeast Anatolia were investigated by organic geochemical methods. The TOC contents range from 0.24 to 1.48 wt for the Hazro samples and 0.19 to 3.58 wt% for the Korudag samples. Tmax values between 438 and 440 degrees C in the Hazro samples indicate thermal maturity; Tmax values ranging from 456 to 541 degrees C in the Korudag samples indicate late to over maturity. Based on the calculated vitrinite reflectance and measured vitrinite equivalent reflectance values, the Korudag samples have a maximum of 1.91%R(g-v), in the gas generation window, while a maximum value of 0.79%R(amor-v) of one sample from the Hazro section is in the oil generation Illite crystallinity (IC) values of all samples are consistent with maturity results.
Pr/Ph ratios ranging from 1.32 to 2.28 and C-29/C-30 hopane ratios > 1.0 indicate an anoxic to sub-oxic marine-carbonate depositional environment.
The Hazro shales do not have any shale oil or shale gas potential because of their low oil saturation index values and early to moderate thermal maturation. At first glance, the Korudag shales can be considered a shale gas formation because of their organic richness, thickness and thermal over-maturity. However, the low silica content and brittle index values of these shales are preventing their suitability as shale gas resource systems.

• 出版日期2016-8