NATURAL SCIENCES

Journal of fundamental
and
applied researches

Determination of alkanes and isoprenanes fractionsin 150–350 °C of oil field Sostinskoe

2013. ¹4, pp. 111-118

Badmaev Chinghis Mingiyanovich - Ph.D. (Chemistry), Assistant, Kalmyk State University, 11 Pushkin Str., Elista, 358000, Republic of Kalmykia, Russian Federation, chingizbadmaev@mail.ru.

Tavunova Tatiana Alexandrovna - student, Kalmyk State University, 11 Pushkin Str., Elista, 358000, Republic of Kalmykia, Russian Federation, chemical@kalmsu.ru.

This article is devoted to the study of the patterns of distribution of alkanes and isoprenanes at a fraction of 150–350 °C oil field Sostinskoe (wells number 3, 8, 9). Group hydrocarbon composition oil field Sostinskoe was determined by aniline points (GOST 12329-77). It is established that in the narrow fractions 60–95 ? C oil field Sostinskoe, wells number 3, 8, 9, the predominant class of hydrocarbons are alkanes (84.04, 85.46 and 86.89 %, respectively), followed by the arena (15.96, 14.54 and 13.11 % respectively), naphtha no. In the fraction of 95–122 °C the predominant class of hydrocarbons are alkanes (55.10, 57.75 and 60.40 %, respectively) followed by naphthenes (28.38, 24.25 and 20.13 %, respectively) and Arena (16.52, 18.00 and 19.47 %, respectively). In the fraction of 122–150 ?C are the predominant class of alkane hydrocarbon (55.09, 56.14 and 57.19 %, respectively) followed by naphthenes (29.66, 28.91 and 28.17 %, respectively) and arenes (15.25, 14.95 and 14.64 %). In the fraction of 150–200 ?C are the predominant class of alkane hydrocarbon (66.54, 55.82 and 45.10 %, respectively) followed by naphthenes (22.18, 31.49 and 40.80 %, respectively) and arenes (11.28, 12.69 and 14.10 %, respectively). Total fraction of from 60 to 200 ?C are the predominant class of alkane hydrocarbon (65.19, 63.79 and 62.39 %, respectively) followed by naphthenes (20.06, 28.22 and 22.28 %, respectively) and Arena (14.75, 15.04 and 15.33 %, respectively). The relative distribution of n-alkanes and isoprenanes the fraction 150–350 °C Sostinskogo oil field well number 3, 8, 9 was examined by gas chromatography. In the fraction of 150–350 °C Sostinskogo oil field well number 3, 9 relative maximum at the peak concentration is n-C17 (12.18, 8.31 %), followed by n-C16 (11.12, 8.06 % ) n-C18 (10.45, 7.57 %), n-C15 (9.78, 7.88 %), respectively. In the fraction of 150–350 °C oil field Sostinskoe well number 8 relative maximum at the peak concentration is n-C21 (9.02 %) followed by n-C20 (8.95 %), n-C22 (8.65 % ) n-C19 (8.14 %), respectively. The relative concentrations of pristane and phytane 0.86 and 0.48 %, 1.85 and 1.04 %, 2.42 and 1.43 %, respectively, their ratio of 1.80, 1.78, 1.71 %. For oils continental genesis ratio pristane / phytane is more than 3, and for the oil marine origin – less than 1 oil field Sostinskoe occupies an intermediate position, and should be referred to the oils of lacustrine origin.

Key words: alkanes,naphthenes,arenas,aniline point method,the normal alkanes,izoprenany,pristane,phytane,gas chromatography