نویسندگان
1 دانشجوی کارشناسی‌ارشد زمین‌شناسی اقتصادی، گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بوعلی‌سینا، همدان، ایران
2 استاد گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بوعلی‌سینا، همدان، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The natural bitumen reserves in the Gilan-e-Gharb region are located in the Zagros Folded belt. The study area lies within the tectonic-stratigraphic zones of Lorestan and the Mesopotamia region, and structurally, within the simple fold belt. Elemental analysis conducted on natural bitumen samples was utilized to determine the types of bitumen in the Gilan-e-Gharb region, identify the various type of kerogen, and estimate the approximate reflectance of vitrinite. For these purposes, 8 samples from natural bitumen reserves were subjected to organic geochemical analysis. Natural bitumens with a reservoir origin typically have an H/C ratio of less than 1. Whereas, the analyzed samples have an average ratio of 1.15. Based on this data, the reservoir origin of the natural bitumens in the study area is deemed improbable.Hence a source rock origin for these reserves is plausible. The average carbon content of the samples is approximately 65 Wt%, indicating their high quality. The types of bitumen in the study area include Grahamite (Ptm3), weathered Albertite (Mjm, Ptm1), Glance Pitch (Jv, Ptm2), and low-weathered Gilsonite (Jv). An inverse relationship exists between the percentage of ash and the percentage of volatiles in the natural bitumen samples, as well as between the percentage of ash and the percentage of carbon. As the amount of ash increases, the carbon content decreases, leading to a reduction in the quality of the natural bitumen. A direct relationship is observed between the percentage of volatiles and the carbon content. This means that an increase in volatiles corresponds to an improvement in the quality of natural bitumen (and their carbon content as well). There is an inverse relationship between the carbon content and ash content and hydrogen value. Additionally, an inverse relationship exists between the percentage of volatiles and the oxygen content, while a direct relationship is notable between the percentage of ash and the oxygen content of the samples. A direct relationship is also established between the percentage of volatiles and the hydrogen content of the samples. All samples exhibit a specific gravity greater than one and a negative API degree which is probable due to relatively high sulfur and nitrogen content.
کلیدواژه‌ها [English]
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