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ECOLOGICAL STATUS OF OLD OIL BOREHOLES IN CENTRAL NORTHERN BULGARIA
Abstract
In the XX century many drillings for exploration and exploration of oil and gas were conducted in Northern Bulgaria. Up to 1500 boreholes with a depth of several hundred meters to more than 5000 m have been drilled on its territory so far. During drilling, aquifers with different hydrochemical properties have been registered. The aim of the present study is to assess the current ecological status of the old oil boreholes in Central Northern Bulgaria. As a result of the field activities a catalogue with information about its locations, actual state and physical-chemical characteristics has been created. There are many boreholes that have been abandoned and not liquidated and others that have been compromised. It has been estimated that most of them do not pose a risk to the environment and also that some of them are used or can be used for different purposes. Only a few artesian boreholes, with high total dissolved solids (TDS) of the water or high concentration of some chemical components, constitute a risk. There is also a possibility of mixture of groundwater from different aquifers as a result of the poor condition of the drill pipes.
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