The Deep Upper Jurassic Lower Cretaceous Aquifer

The main aquifer in the study area is the Upper Jurassic - Lower Cretaceous aquifer complex, located in the limestone and dolomite deposits. It is generally confined and affected by the regional WNW - ESE and NNE - SSW fault systems mentioned above (Fig. 28.2). In the southern and eastern parts of South Dobrogea, the deep aquifer complex is separated from the Sarmatian aquifer by a Senonian aquitard consisting mainly of chalk and marl. The natural boundary of the Upper Jurassic - Lower Cretaceous aquifer is the Capidava - Ovidiu Fault (Fig. 28.4). The piezometric surface indicates that the Upper Jurassic - Lower Cretaceous aquifer is supplied from the Bulgarian territory, where the Upper Jurassic deposits out crop [3]. The aquifer discharges eastward to the Black Sea and northeastward to Lake Siutghiol. It is also supplied by vertical percolation from the Sarmatian aquifer in the western part of South Dobrogea. Along the coast, the piezometric surfaces of the Upper Jurassic - Lower Cretaceous aquifer are higher than those of the Sarmation aquifer resulting in upward vertical flow.

The abstraction rates at the installation of the wells are around 22 l/s in the tectonic block 5, around 7.5 l/s in the tectonic block 10 and around 6.6 l/s in the tectonic block 13.

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