Perspektywy magazynowania węglowodorów w najstarszej soli kamiennej (Na1) cechsztynu w rejonie Kartuzy–Gdańsk (bloki koncesyjne 48 i 49)

Abstract

Hydrocarbon storage potential of Zechstein Oldest Halite (Na1) salts in the Kartuzy–Gdańsk area (concession blocks 48 and 49)A b s t r a c t . A potential region for underground hydrocarbon storage in Poland is an area between Gdańsk and Kartuzy (concession block 49) and west of Kartuzy (concession block 48) (Fig. 1). Hydrocarbons can be stored in the Zechstein Oldest Halite (Na1) seam. Location close to the cities of Gdańsk and Gdynia and a simple geological framework make this area attractive for hydrocarbon storage. In the study area 2D seismic surveys have been carried out for Polish Oil and Gas Company (PGNiG) by Geofizyka Kraków in 2003 and by Geofizyka Toruń in 2008. Based on these 2D seismic surveys, the thickness of Zechstein deposits is 250–350 m in the north and ca. 350–400 m in the south. The first cyclothem (PZ1) is completely developed with thicknesses from ca. 220 m to 270 m. The top of the Oldest Halite interval is at a depth of 1020 m in the north and 1380 m in the south with the unit attaining a thickness from dozens of meters to ca. 240 m. The Na1 salts occur in many salt minibasins with dimensions from ca. 5 x 5 km and are surrounded by the Lower Anhydrite (A1d) swells. Locally, above anhydrite swells the Na1 salts completely pinch out. Total thicknesses of cyclothems PZ2, PZ3 and PZ4 reach ca. 80–100 m. To sum up, the study area is an example of location very attractive for hydrocarbon storage in the Na1 salts.