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The U.S. Geological Survey (USGS) quantitatively assessed the potential for undiscovered, technically recoverable continuous oil and gas resources in the Volga-Ural Region Province of Russia (fig. 1). This study focused on the geologic evaluation and assessment of oil and gas source-reservoir rock systems (petroleum systems) and potential resources of the Upper Devonian–Lower Carboniferous (Tournaisian) Domanik-type formations. These include the Domanik Formation and Domanikoids (younger rocks overlying the Domanik Formation). For this assessment, the USGS defined continuous oil and gas systems that (1) contain at least 2 weight percent or more total organic carbon, (2) occur within the thermal maturity window for oil or natural gas generation, (3) have thick (15 meters or more) organic-rich shale, and (4) contain Type I or Type II organic matter (Charpentier and Cook, 2011). Many studies have been published on the Domanik-type formations, providing information on sourcerock characteristics, tectonic history, thermal history, and timing of the maturation and generation of hydrocarbons (Zaydelson and others, 1991; Fadeeva and others, 2016). Several conventional oil and some gas fields or accumulations have been discovered in the Volga-Ural region that produce from reservoirs, commonly in structural traps and reefs (Ulmishek, 1988). Reports on the number of wells that produce directly from Domanik-type formations but not from conventional accumulations were unavailable for this study. The Domanik Total Petroleum System and three assessment units (AUs) were defined for this assessment (fig. 1). The Domanik Formation Continuous Oil AU was delineated over much of the eastern part of the province. The Domanik Formation source rock was deposited during a maximum transgression of sea level during the Late Devonian (early Frasnian) above older nearshore sediments (Ulmishek, 1988). The Domanikoid Continuous Oil AU was deposited above the Domanik Formation in elongated areas (troughs) between reefs and carbonate platforms. The Domanikoid Continuous Oil AU is younger than the Domanik Formation Continuous Oil AU (Peterson and Clarke, 1983). Both the Domanik Formation Continuous Oil and Domanikoid Continuous Oil AUs are thermally mature with respect to oil generation. The Domanik Formation Foredeep Continuous Gas AU was delineated in the eastern part of the region in a foredeep basin along the Ural Mountains where the Domanik source rock is deeper and presumably thermally mature with respect to gas generation. Detailed production data for continuous resources outside of the United States are difficult to obtain, so the USGS assessment methodology uses production data of continuous oil and gas accumulations from the United States, which serve as analogs. Specifically, mean estimated ultimate recoveries from populations of continuous oil and gas wells, the mean drainage areas of drilled wells, and ranges of average well success ratios were used to estimate undiscovered continuous oil and gas resources. Principal input data used in the assessment are listed in table 1. Geologic Model

Assessment of undiscovered continuous oil and gas resources in the Domanik-type formations of the Volga-Ural Region Province, Russia, 2017