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As part of the U.S. Geological Survey’s (USGS) National and Global Petroleum Assessment Project, the USGS completed an assessment of the conventional and continuous (unconventional) oil and gas resources of the Baltic Depression Province (fig. 1). The Baltic Depression Province is an area of approximately 232,410 square kilometers (km2) that exists partly offshore and includes areas of onshore Poland, Russia (Kaliningrad), Lithuania, Latvia, Estonia, and Sweden. For this study, the Lower Paleozoic Composite Total Petroleum System (TPS) was defined to include lower Paleozoic source rocks and conventional oil and gas reservoirs. The Lower Paleozoic Reservoirs Assessment Unit (AU) was bounded, in part, by the Silurian outcrop (Poprawa and others, 1999) and the 500-meter (m) isopach of Cambrian rocks (Shogenova and others, 2009). Discovered conventional oil and gas accumulations in the province (IHS Energy, 2013) provide evidence for: (1) the existence of a viable petroleum system containing lower Paleozoic source rocks, (2) the

Assessment of undiscovered conventional and continuous oil and gas resources of the Baltic Depression Province, 2014