Oilfield development in the European North of Russian, within the territory of Nenets Autonomous Okrug, provides a negative impact on the components of the environment, including the geological environment. In a permafrost environment, disturbance of the permafrost's thermal regime may cause the subsidence of production facilities, deformations and stresses in structures and buildings. This can lead to accidents involving pollution of top portion of the geological environment (GE) by petroleum products. Accumulation of significant volumes of industrial waste causes additional pollution

This study of the nature of the thermal impact on the top portion of the GE has been conducted at the Ardalin group of oilfields located in the northern part of Timan-Pechora Oil and Gas Province (TPOGP). The study utilizes the results of many years of monitoring and studies of the thermal state of permafrost near the oil production facilities and injection wells, as well as the thermal state of the drilling waste buried at Ardalin Oilfield Facility (AOF) located in the Pechora-Kolva Oil and Gas section of TPOGP. AOF includes Ardalin, Oshkotyn, East Kolva and Dyusushev oilfields (Fig. 1).

Oil deposits at AOF oilfields are associated with the Middle and Upper Devonian and are represented by different types of enclosing rocks, ranging from algal, porous and porous-vugular limestones at Ardalin oilfield to vugular-porous, clayed dolomitic limestones at Oshkotyn oilfield (Fig. 2). The oil deposits of East Kolva and Dyusushev oilfields are associated with the Frasnian Stage, represented by interbedded greenish-gray dense, hard argillites. The thickness of the productive pools ranges from 100 m at Ardalin to 27 m at Oshkotyn to 25 at East Kolva and Dyusushev oilflelds. The ultimate oil reserves are 25 MM tons (16.4 MM tons at rdalin, 4.7 MM tons at Oshkotyn, 1.3 MM tons at East Kolva and 2.6 MM tons at Dyusushev).

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