Varietatea densităţii formaţiunilor geologice din regiunea de sud a Republicii Moldova [Articol]

Abstract

This study focuses on the geological and petrophysical characterization of the sedimentary formations within the Predobrogean Depression, located in the southern part of the Republic of Moldova. Detailed analysis was carried out in three structurally signifi cant sectors: Baimaclia, Baurci, and Aluatu, based on data obtained from deep boreholes, gravimetric surveys, and seismic methods. The main objective was to investigate the spatial distribution of rock density and its relevance in identifying structural discontinuities and potential hydrocarbon traps. The rock density values, determined through petrophysical analysis, exhibit significant variation with depth, ranging from 1.3 g/cm³ to 2.8 g/cm³. Two major density discontinuities were identified: an upper one corresponding to the stratigraphic boundary between Mesozoic and Cenozoic formations, and a lower one around 1600 m depth, marking the transition to compact Paleozoic rocks. These discontinuities are consistent with gravitational anomalies and suggest the presence of brachyanticlinal structures capable of hydrocarbon accumulation. The integration of density data with geophysical interpretations supports the delineation of two linear density zones aligned with regional tectonic trends, reinforcing the structural model of the depression.