Facies interpretation from gamma ray (gr) log as basic well logs applied to Volodymyrska field (Dnipro-Donetsk depression)

Abstract

Summary This paper presents the interpretation of data (depth interval 1700–2560 m) from well-logs obtained from Volodymyrska Field (Dnipro-Donetsk Depression). GR log is mainly used to predict the varying lithology in borehole by measuring the spontaneous emission of GR radiation from rocks. But the study aims at using Gamma Ray (GR) log in establishing the sedimentary facies, their successions and environments of deposition in this field. Five log facies were recognized in the study area: a cylindrical-shaped facies representing fluvial channels; a funnel-shaped facies representing shoreface; a bell-shaped facies representing proximal deep sea; a symmetrical-shaped facies representing transgressive shelf sands; a serrated-shaped facies representing debris flow and canyon fill. Each of the type of facies has its own sediment supply and characteristic provides a stratigraphical frame for environment interpretation.