Seismic analysis of the Gusar-Devechi oil and gas district

The Gusar-Devechi zone is located in the southeastern part of the Great Caucasus range of mountains. The effect of seismotectonic processes on hydrocarbon deposits in the studied area was studied. It has been established that earthquake foci located in the area cause the migration of oil and gas deposits. On the basis of digital data, weak tremors were recorded without loss and it was determined that the area is characterized by weak seismicity. Shocks with magnitude ml≥3.0 are observed to coincide with Siyazan, Zangi-Gozluchay, Taircalchay-Salyan deep faults. Seismic activity is mainly observed in Shabran-Siyazan area. The earthquakes mainly occurred within the 2–10 km deep sedimentary layer. It was found that in the Gusar-Devechi region and border areas there are a number of sources that can cause earthquakes with intensity I0=VI÷VII. In these sources, during strong earthquakes, cracks form, which can cause the collapse of oil and gas structures and the migration (leakage) of oil and gas. Based on data on the deep geological structure of the region and the structure of the main boundaries of the earth's crust, it can be noted that at a depth of 5–10 km a clear boundary is identified, corresponding to the surface of the consolidated crystalline crust. At a depth of 25 km, the roof of the basalt layer of the earth's crust is exposed. In the depth range of 40–50 km there is the Moho boundary.