No abstract

Ê Àðêòè÷åñêîé çàïîëÿðíîé çîíå Òèìàíî-Ñåâåðîóðàëüñêîãî ðåãèîíà îòíîñèòñÿ Íåíåöêèé àâòîíîìíûé îêðóã Àðõàíãåëüñêîé îáëàñòè, Âîðêóòèíñêèé è ÷àñòè÷íî Óñèíñêèé, Èíòèíñêèé è Óñòü-Öèëåìñêèé ðàéîíû Ðåñïóáëèêè Êîìè.  ýòîé çîíå íàõîäÿòñÿ ìåñòîðîaeäåíèÿ íåôòè è ãàçà, óãëÿ, ðàçðàáàòûâàþùèåñÿ â òå÷åíèå óaeå ìíîãèõ ëåò è èãðàþùèå âàaeíåéøóþ ðîëü â ñîöèàëüíî-ýêîíîìè÷åñêîì ðàçâèòèè òåððèòîðèé.

Lower Triassic sequences Shapkin-Yuryakha Shaft of the Timan-Pechora Petroleum Province were studied by the complex lithological, petrophysical and geochemical methods. It is established that productive deposits are represented by sandstones that formed in arid climates amid a vast alluvial-lacustrine plain. The research allowed to study and characterize the structure features of rock and mineral aggregates, forming pore free space textures. The high heterogeneity of the composition and structure of the cement minerals of the reservoir caused by local faciespaleogeographic sedimentation conditions, were the cause of the significant variability of the void space. Rocks reservoirs are complex, with high content of clay component; an effective field development requires special methods of stimulation.

Recently various authors paid much attention to accessory minerals of clastic rocks to clarify the composition of the source area and formation conditions of terrigenous deposits. The paper describes some minerals of the heavy fraction of Triassic sandstones in the north of the Timan-Pechora oil and gas province (garnet, epidote, chromium spinels, ilmenite, etc.). We showed that the enrichment of sandstones with various mineral grains was controlled by not only the composition of the eroded rocks, but also by the hydrodynamics of the flow, as well as the method of transfer of clastic material. We noted that the features of heavy fraction minerals could be used to reconstruct sedimentation environments, taking into account their physical and chemical properties, distribution of minerals by fractions, and their stability during transportation.

The paper presents Tatyana V. Maydl’s researches of formation and patterns of distribution of natural reservoirs in carbonate deposits of the Timan-Pechora oil and gas province. Tatyana Viktorovna Maydl is a recognized specialist in oil and gas geology. Her significant contribution to the development of the theoretical base of formation of carbonate deposits in the region, reconstruction of sedimentation conditions, finding degree of influence of secondary transformations on the reservoir and filtration properties of carbonate rocks, development of the basis for geological models of carbonate reservoirs, are analyzed. In the field of studying the morphology of the void space in low-capacity carbonate reservoirs, T. V. Maydl found that in the Lower Silurian dolomites with a shadow biohermal structure had the best filtration features, and in the Upper Silurian — bioclastic limestones. The main volume of the void space in the first type is associated with caverns and cracks, in the second — with matrix porosity. We showed that the results of T. V. Maydl’s work were not only of theoretical, but also of practical importance.