Comparative characteristics of the properties of oil of the Orenburg region fields

Physico-chemical properties of oil are important for making design and technology de­cisions in the process of production and transportation of hydrocarbons and derived products. A number of oil fields related to the different geological setting of the Oren­burg oil and gas province were chosen for comparative analysis of oil physico-chemical properties. Geochemical processes of transformation of organic matter govern a regular­ity of occurrences distribution of crude oil of different composition during sedimenta­tion before the formation of deposit, and hydrocarbons in the deposits after accumula­tion as well. General characteristic of selected oil fields is presented. It was found that there is no significant difference in the oil properties throughout the area of the Oren­burg subsalt fields; light or medium density oil predominates; Tarashchanskoye, Gar-shinskoye, and Morgunovskoye oil has a high freezing point; and oil ranges from low-sulfur to high-sulfur.