Geology, geography and global energy

Scientific and Technical Journal

HE STRUCTURE OF THE UPPER PART OF THE SEDIMENTARY SECTION IN THE SOUTH CASPIAN

2019. №3, pp. 14-25

Poletayev Alexander V. - Ph. D. in Geology and Mineralogy, Leading Researcher, Oil and Gas Institute of National Academy of Sciences of Azerbaijan, Baku, AZ1000, Republic of Azerbaijan, avo1@mail.ru

The relevance of the research is to study the gases of the upper part of the section of the Southern Caspian, in particular its deep-water part, which is of significant practical interest when searching and estimating hydrocarbon potential of gas hydrate zones. The purpose of the research is to study the distribution of the intensity of hydrocarbon gases by area, as well as the detection of gas generation zones. The object of the research was 1282 gas samples selected in the South Caspian at Shah Deniz, Bakhar, Pirallahi, Khali, deep-water South Caspian, and other geological and geophysical data. The data on the chemical and isotope composition of the hydrocarbon gases of the South Caspian basin were used on 147 gas samples taken from oil and gas fields, 153 samples from mud volcanoes, 29 samples from bottom sediments and 4 samples from gas hydrates. Research methods are based on interpretation of gas survey data and investigation of isotope and chemical composition of hydrocarbon gases of the Southern Caspian. As a result of the studies maps of the change in the content of methane, ethane, propane, butane within the upper part of the section for the studied deposits were constructed. Based on the analysis of the change in the intensity of gas manifestations by area and depending on the geological conditions it is established that mud volcanoes and faults are excellent ways for hydrocarbon migration and reflect the geological situation and the generation potential of the submerged deposits of the Southern Caspian. It has been 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 the upper part of the section.

Key words: газовая съёмка, Южный Каспий, разломы, грязевые вулканы, газоносность, gas survey, South Caspian, faults, mud volcanoes, gas content

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