Prospecting for karst disturbances using electrical exploration methods

Abstract

The industrial oil shale reservoir of the Leningradskoye field is confined to the Kuker horizon of Ordovician limestones. The thickness of the overlying strata varies from 50-60 m in the north to 80-100 m in the south. In the northern part, Ordovician limestones are directly spread under Quaternary sediments; in the southern part, apart from Quaternary sediments, they are overlain by Middle Devonian sediments (marls, sands and clays). The thickness of Quaternary sediments averages 5-10 m.