THE RELIEF IMPACT ON THE FORMATION OF NON-ANTICLINAL OIL TRAPS IN THE DEVONIAN EVAPORITE DEPOSITS OF THE PRIPYAT TROUGH. Svetlana Obrovets, Semen Kruchek, Institute of Geological Sciences, Minsk, Eduard Vysotsky, Belarussian State University, Minsk

Searching for non-anticlinal traps is the determination of paleostructrures that had existed in the paleorelief and that are not necessarily manifested in the modern structural pattern. Paleogeomorphological reconstructions may be used to forecast these traps. The relief of the northern part of the Upper-Devonian saliferous basin floor has been reconstructed. Negative and positive paleolandforms have been differentiated: islands, submarine slopes of islands, submarine uplands, hills, submarine plains and valleys. The types of traps occurring in the halite substrata have been distingished, some peculiarities of their morphology have been determined, and the main features of paleogeomorphological environments where reservoir rocks were deposited have been revealed. Paleogeomorphologically, the distribution of hydrocarbon traps in the halite subformation was dependent on the paleorelief of the sedimentary basin floor, i.e. these are usually confined to specific paleomorphological structures: submarine uplifts, hills, ridges, submarine island slopes, and to fan deltas – in the south of the Pripyat Trough.