Geology, geography and global energy

Scientific and Technical Journal

Geochemical classification of gas condensates

2013. №2, pp. 47-60

Mercheva Valentina S.  - C.Sc. in Technology, Associate Professor, Astrakhan State University, 1 Shaumyan sq., Astrakhan, Russian Federation, 414000,,

Serebryakov Oleg I.  - D.Sc. in Geology and Mineralogy, Professor, Astrakhan State University, 1 Shaumyan sq., Astrakhan, Russian Federation, 414000,,

By the chemical classification of oils (for Al.A. Petrov) gas condensate can also be divided into four basic chemical types: A1, A2, B2, B1 (example of the Yamal gas condensates and adjacent regions of western Siberia). Type A1sootvetstvuetalkanovym gas condensate and its hydrocarbon composition is close to the corresponding alkanovymneftyam. Types A2 and B are naphthenic condensates, since their composition contains more than 50 % naphthenes. In such condensates A2kolichestvo naphthenes is 60–70 %, increasing to 75 % in the condensates B2 and reaching 80–90 % in the condensates chemical type B1. Moreover, naphthenic gas condensate type B2 iB1 divided according to their prevalence in the structures of different types of chemicals – isoprenoid, cyclanic, monocycle geminal substitution type, bi-and tritsikloalkanov – by subtypes B2 and B2ts, B1m, B1b and B1t. When typing gas condensates accounted for and their other characteristics: 1. composition and the virtual absence or very low tar, sulfur and paraffin; 2. predominance of gasoline fractions boiling up to 200 ° C; 3. great variability of the composition due to the extensive development in strata reverse retrograde processes of evaporation and condensation back; 4. dependence of hydrocarbon and fractional composition of the selection criteria. To select types of gas condensates are used and the following group rates: 1. hydrocarbon composition of naphtha (NC -200 ? C); 2. content of fractions boiling above 200 ? C; 3. the total sulfur content. Gas condensates are almost out of petrol and kerosene fractions, so even a small amount of sulfur is reflected in their use. Therefore, this indicator is to identify the geochemical importance of hydrocarbons, particularly natural gas condensates. Classification of gas condensate from the use of analytical methods for carbohydrates at the molecular level can not only solve genetic problems of forming a deposit, but also more widely adopted in the manufacturing process of refining ways to maximize the use of raw materials in-depth, which increases the efficiency of geological exploration.

Key words: gas condensate,physico-chemical properties,molecular structure,classification,chromatography,paraffin,sulfur compounds,alkanes,the cyclic alkanes,aromatic compounds,naphthenic hydrocarbons