Ocena hydrochemiczna możliwości występowania węglowodorów w nadbałtyckiej części antyklinorium i synklinorium pomorskiego

Abstract

HYDROCHEMICAL ESTIMATION OF HYDROCARBON OCCURRENCES IN THE PERI-BALTIC PART OF THE POMERANIAN ANTICLINORIUM AND SYNCLINORIUMSummaryThe paper presents the results of examinations on water-bearing horizons of the Palaeozoic and Mesozoic formations in the North-West Poland. According to W. A. Sulin’s classification somv hydrochemical zones have here been distinguished, characterized by various perspectives as to the possibility of preservation of hydrocarbon deposits. As far as waters of hydrocarbonate-sodium type are concerned, the Lower Jurassic formations, found occur in the westerly part of the area in study, have been referred to a low-perspective zone. Of similar importance are also deposits of Jurassic and Triassic age that occur within the chloride-calcium waters, characterized by a Na:Cl ratio amounting to 0,75, as well as Permian deposits in which brines, that resemble salt lyes, occur.To the medium-perspective zone of chloride-calcium brines characterized by a Na:Cl ratio, equal to 0,60–0,75, are referred Muschelkalk deposits pierced by bore hole Jamno 3, and Rhaetic, Keuper and Zechstein deposits found to occur in the central part of the area considered The perspective zone is characterized by the presence of relict brines of chloride- calcium type, revealing a Na:Cl ratio greater than 0,60, and a considerable amount of biophile elements. This zone includes both Devonian and Carboniferous deposits, as well as partly Zechstein deposits.The Peri-Baltic zone of the Pomeranian anticlinorium and synclinorium is strongly dislocated. Along the dislocations are found springs of mineral waters.