The region’s oil fields are located within the South Caspian oil and gas basin, on the territory of the Absheron Peninsula and the adjacent waters of the Caspian Sea. Here are more than 80 oil and gas fields. To this end, this article presents the geological structure of the South Caspian Depression, as well as the Absheron-Balkhan zone. The analysis of oil and gas content and modern seismicity of the Caspian Sea is carried out. Increasing recoverable oil reserves, reducing water cut, increasing or even stabilizing production at this stage is the number one task for the oil industry. It has been established that in recent years, the level of seismic activity of individual sections of the Caspian water area has increased, and the amount of seismic energy released in the Central Caspian has increased by several dozen times, it can be assumed that the change in oil production in many offshore fields in the northern part of the Absheron-Balkhan fold system is associated with strong (ml>3.0) earthquakes characterized by fault-shear type of movements. Keywords: Caspian sea; oil and gas deposits; earthquake source mechanisms.

In 2015, the network of Azerbaijan seismic stations included 35 digital stations, which continued to operate unchanged. The set of parameters determined for estimating the earthquake magnitude has decreased – determination of the MPVA magnitude and КР energy class has ceased. Only the local magnitude MLАзр was measured. The total number of earthquakes recorded by the Azerbaijan network of stations in 2015 amounted to 6419, however, only 128 of them with MLАзр3.0 are given in the catalogue of earthquakes of Azerbaijan published in the Appendix to this article. Seismic activity in the study area remained unchanged. The released seismic energy changed insignificantly compared to its value in 2014 and was close to the background level for the period 1993–2014. The increase in the number of earthquakes of the representative level (K≥8.6, MLАзр≥2.8) in comparison with the long-term average annual value is due to aftershocks of earthquakes on January 26 with MLАзр=4.9, June 3 with MLАзр=4.6, and September 4 with MLАзр=5.9. The 2015 most significant seismic event on the territory of the Republic was the earthquake on September 4 with MLАзр=5.9 and seismic intensity at the epicenter of I0=7.

The paper presents the results of the analysis of seismicity, tectonics and the manifestations of induced seismicity in the area of the Mingachevir reservoir for the period 2008-2017. Local earthquakes that occur when the Mingachevir reservoir is filled have insignificant magnitudesless than 2-2.5, tremors with a magnitude of 3.5 are less common. Epicenters are located mainly at a distance of no more than 5-10 km. Data analysis showed that seismic activity increases when the pressure reaches 78 m or more. Based on the mechanisms of the earthquake source, maps of the distribution of compressive and extension stresses in the horizontal plane and in depth were constructed. It was found that the northwestern part of the study area is characterized by extension and compression in the south and southeast. Analysis of seismic activity observation data showed the dependence of the rate of change of the water level in the reservoir with the seismic activity of weak earthquakes, which is non-linear. The rise in water level lasts 5 months, from March to June. In August the water level at the beginning drops gradually and then sharply (from 80-78 m to 74-73 m). As a result of the drop in water level in this area the induced seismicity increased. In 2010 the water level in the Mingachevir reservoir increased from 78-79 meters in March to 82-83 meters in May, caused an increase in the water level in the Kura River and attracted flooding. An analysis of seismicity for this period showed that in February, March, April, July and August 21 earthquakes with magnitudes of 1.2-3.0 occurred in this region

The character of the chemical interaction and glass formation in the As 2 S 3-CuCr 2 Te 4 system was explored by means of physicochemical analysis (DTA, MSA, XRD, density and microhardness measurements) and a phase diagram was constructed. It was established that the state diagram of the system is a quasi-binary eutectic type. In the system narrow homogeneous regions of up to 1.5 mol % As 2 S 3 and 3.5% mol % CuCr 2 Te 4 were detected. Compounds As 2 S 3 and CuCr 2 Te 4 with each other form a eutectic composition of 10 mol. % СuCr 2 Te 4 with a melting point of 270 o C. Under ordinary conditions, in the As 2 S 3-CuCr 2 Te 4 system based on As 2 S 3 , the glass-forming region reaches 15 mol % CuCr 2 Te 4 .

Alloys of the As2Se3–CuCr2Te4 system were synthesized in a wide range of concentrations, and their physico-chemical properties were studied by differential thermal analysis (DTA), X-ray diffraction (XRD), microstructural (MSA) analysis, as well as by determining the microhardness and density, and its [Formula: see text]–[Formula: see text] phase diagram was constructed. It has been established that the phase diagram of the As2Se3–CuCr2Te4 system is quasi-binary of the eutectic type. The system has small single-phase fields based on the original components. In the As2Se3–CuCr2Te4 system, the area of the solid solution based on the As2Se3 compound at room-temperature is 2 mol%, and the area of the solid solution based on the CuCr2Te4 compound is 6 mol%. Joint crystallization of As2Se3 and CuCr2Te4 ends at the double eutectic point with a composition of 15 mol% CuCr2Te4. With slow cooling in the As2Se3–CuCr2Te4 system based on As2Se3, the glass formation region reaches 10 mol% CuCr2Te4. The magnetic properties of the obtained solid solutions (CuCr2Te[Formula: see text](As2Se[Formula: see text] ([Formula: see text]–0.03; 0.05) were studied.