Home – Home – Jornals – Russian Geology and Geophysics 2018 number Неопубликованное

Maps of isotope composition changes according to area extent, as well as graphs of HC distribution depending upon stratigraphic age, including rocks, graphs of isotope composition change on sampling depth were compiled for HC study and oil-gas deposits formation. Gases genesis according to M. Shoelle and A. James methodic were studied. Two stages of formation were distinguished as a result of gases study of various forms of their manifestation. The first stage has begun in the underlying PS deposits and continued up to PS deposits. At this stage one various kind of tectonic fluctuations can observed. The second stage of HC formation has started from PS and characterized with a change of geodynamic conditions in region. Avalanche sedimentation, predominance of descending movements over ascending ones promoted the accumulation of thick sediments in PS age. As a result of sediments accumulation and tectonic processes (down warping) in the deep-seated basin led to the complication of thermobaric conditions in the sedimentary series. There were determined basic ways of HC migration as well as estimated oil-gas content prospective. The results of the gas survey within the deep-water part of the South Caspian were considered in detail and it was established that for this zone gas generation is typical, with the predominance of two components - methane and ethane. Study of HC migration trend in time and area as well as areas of generation etc. allows to reveal some structures where there is evidence of HC accumulation with large and gigantic reserves. It was established that hydrocarbon gases in bottom sediments and sediments of the upper part of the South Caspian section are closely related to the sources of hydrocarbon formation, migration and other processes occurring in deeply buried sediments, as well as in upper part of the section.