Geoecological aspects of the research into deeply submerged subsalt deposits of the Pre-Caspian depression
In the last few years exploration works on the deeply submerged deposits of Pre-Caspian depression to search for nonsulphurous gas and oil were intensified. With this purpose the first deep wells on the Devonian complex deposits were initiated in different parts of the basin. Low levels of deposits investigation by seismic exploration and drilling, the underestimation of qualitative changes of filtration-capacitive properties of rocks and tires at great depths, the lack of geological and hydrodynamic model, the mismatch of the projected formation pressures and temperatures to actual ones, the complexity formation fluids and mining and geological conditions, the difficulty of the drilling process control, the inaccuracy of the complications forecast, the bad technical condition of wells determine the increased ecological danger of exploration. Therefore, under the study and development of hydrocarbon resources of the deep-seated Devonian deposits, development and introduction of the system of prevention possible oil and gas emissions and pollution of ecosystems, ecological monitoring of subsoil of the Pre-Caspian region and the Caspian Sea as a whole are required that will allow to avoid possible environmental catastrophes.