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Background. Modern advances in the extraction of hydrocarbons from shale and tight formations, namely improved horizontal drilling technologies and multi-stage hydraulic fracturing at economically viable costs, are opening up new horizons for oil and gas exploration and development around the world. The importance of shale oil and gas has sparked interest around the world following the great success of production in North America. This article is a continuation of a series of publications on the study of Visean unconventional reservoirs within Dnipro-Donets Depression. In this paper, the Visean sediments, namely the Lower Visean carbonate plate of the XIII MFH (horizons V-24-25), and the "Rudov Beds", siliceous calcified organic-rich shales (V-23) within the identified prospective zones of the Dnipro-Donets Basin (DDB), are considered for their unconventional reservoir development potential using the method of analogy with successful North American formations. Methods. Key geological and geochemical parameters were compared with the selected analogues, namely, geological age, sedimentation conditions, lithology and sediment thickness, geochemical data (total organic carbon (TOC), vitrinite reflectance (Ro), rock generation properties according to pyrolytic studies and rock maturity), mineralogical composition and porosity. Results. According to this study, the Visean unconventional deposits within DDB clearly correlate with the most productive gas fields from unconventional reservoirs (shales, organic-rich carbonates) in North America. The depth and geological position of the Visean unconventional targets are generally comparable to or slightly higher than their North American counterparts based on available data; sediment thicknesses are in similar ranges. In terms of mineralogical composition, namely X-ray diffraction (XRD) analysis, the ore beds are similar to the Barnett and Woodford shales, and the V-24-25 carbonate horizons correspond to the Eagle Ford Formation. The high average TOC content of the V-23 horizon (up to 10% by weight) is comparable to the Bakken and Woodford shales. Сonclusions. The geological and geochemical parameters of the Visean horizons considered in this paper are promising in terms of the prospects for the development of unconventional reservoirs to increase Ukraine's energy resource base. However, in order to draw conclusions about the economic profitability of the development of the studied objects, a more detailed study is required, taking into account the results of drilling and testing after multistage hydraulic fracturing.
Over the past two years, the Federal Antimonopoly Service of the Russian Federation (from now on referred to as FAS) raised the issue of the internal gas market's efficiency, as well as possible scenarios for its partial or complete deregulation. Previously several times settled task has been discussed in the context of the transition to market pricing of wholesale gas volumes and the preservation of state regulation regarding tariffs for the transportation of gas through the Unified Gas Supply System (from now referred to as UGSS). However, to date, the regulation of the domestic gas market, pricing rules and tariffs for transportation have not changed significantly, except for somehow development of the gas exchange trading (SPIMEX), which nevertheless also has some problems and constraints to the development of open market trade. The main criticism in this issue is the currently applied pricing regime, which consists in the presence on the over-the-counter (OTC) market of monopolistically regulated prices and the so-called open pricing mechanism, and exchange prices on the Saint Petersburg International Mercantile Exchange (SPIMEX) gas exchange, respectively. Experts agree that such a system leads to an asymmetry of the market, and, as a consequence, its inefficiency, unequal position of players in the market, as well as risks of a serious shift of the balance towards one player in case of a significant change in gas market regulation. In this regard, each separate proposal of the FAS on reforming the domestic gas market, whether it relates to the division of the dominant seller into production and transportation or the abolition of price regulation, faces severe contradictions on the each player's side. Thus, the pilot project in three subjects of the Russian Federation (Tyumen Region, Yamal-Nenets, and Khanty-Mansiysk Regions) was discussed to be settled in 2016 on the abolition of the lower boundary of the monopolistic regulated gas price for industrial consumers. The project, however, has not been implemented due to the reason mentioned above for the disagreements of all interested parties. Such aspects further exacerbate this problem as the share of the gas industry in exports, and, in particular, the export of liquefied natural gas (from now on LNG). The role of LNG in the transformation of global, regional gas markets has been noted over the past decade by the IEA and Russia, as one of the players in this industry, is also setting strengthening rules the positions of Russian gas companies in LNG markets as one of the country's developments priorities. The paper briefly examines the proposed reforms on the abolition of the gas price lower limit for industrial consumers in the context of the impact on independent gas producers, their market position, market value and credit rating. Also, the work considers the development of exchange trade in natural gas, as an indicator of open pricing and related problems.
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