ON THE ROLE OF POTENTIAL METHODS TO STUDY THE SALT AND REEF STRUCTURES IN THE DNIEPER-DONETS BASIN

The article deals with some of the results of integrating geophysical methods applied in prospecting for unconventional hydrocarbon deposits under salt-stock bodies in the areas of concentration of small and low-amplitude anticlines and reef sites in the Dnieper-Donets basin (DDB). Analysis of potential methods shows that within the DDB there are three types of salt-diapirs, which have certain characteristics in gravimetric and magnetic fields. The first and most common characteristic is the intense minima in gravity and no reflection in themagnetic field. The less common second type is stocks that outline the minimum gravity against maximum in the magnetic field. The third one, having a peculiar nature, shows both gravimetric and magnetic positive anomalies. Such a variety of manifestations of stocksin the gravimetric and magnetic fields is due, primarily, to their complex morphology. The results of the geophysical surveys over the reef structures and the low-amplitude elevations formed over them show that they are mapped by linear, sometimes isometric, local maxima of the force of gravity of moderate intensity. The comparison of results of previously performed studies of gravimetric and magnetic fields shows their high geologic efficiency in studying the morphology of salt stocks and identifying prospective near-stock objects when combined with seismic data and the data from exploration drilling.Low-cost geophysical gravimetric and magnetic methods significantly reduce the cost of drilling deep exploration wells.