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Investigation of the paramagnetic properties of core samples from the section of the reference well was performed on the basis of a representative sample (97 samples) by electron paramagnetic resonance (EPR) for mineral associations of the Evlan horizon of the Upper Devonian deposits of the Volga-Ural region of the Republic of Tatarstan. Within the Volga-Ural region, reef formation dates back to the late Frasnian and has developed to the maximum extent in the Voronezh, Evlan and Liven times. The deposition of the ...

The reef system (carbonate platform) is a geomorphological barrier and a sedimentary and chemical-biological filter in a directed flow of geo-biosphere processes. To carry out lithological and geochemical reconstructions of these processes, an analysis of the change in oxidation-reduction conditions, climate, intake of organic matter type and mineral composition is required. Increased attention to these carbonate platforms is due to the fact that within their boundaries hydrocarbon deposits are discovered, confine...

Many oil and gas low permeable reservoirs have been stimulated to enhance productivity. Acid fracturing is one of the commonly used well stimulation treatment in carbonate formations, such as limestone, dolomite, and chalk. Carbonate reservoirs are good candidates for acid fracturing since strong acids such as hydrochloric acid react easily with carbonate. The acid reacts within the fracture to create a differentially etched surface that will maintain a conductive pathway. Habitually, a pad fluid is injected ahead...