Geochemical Characteristics of Aromatic Hydrocarbons in Crude Oil of Shawan Formation in Chunguang Block, Northwestern Margin of Junggar Basin

摘要/Abstract

摘要： In order to ascertain the oil-gas origin in Chepaizi area in northwestern margin of Junggar Basin, this paper studies the 40 crude oil samples from the Miocene Shawan formation in Chunguang block of the basin using GC-MS analysis, and presents the distributions and compositions of aromatic hydrocarbons biomarker, as well as their geological and geochemical implications. There are abundant aromatic hydrocarbons detected in Shawan crude oil, which can be regarded as an important basis for the judgement of organic matter maturity, kerogen type, hydrocarbon charge and migration direction. The study shows that the Shawan crude oil is in mature stage, formed in continental oil environment, and its kerogen contains a certain extent of input higher plants, and there exist some differences among precursors for different types of crude oils. According to the RPN and m(4-MDBT)/m(1-MDBT), the Shawan crude oil in this area is originated from WS to ES directions, and characterized by that the light crude is close to hydrocarbon source area, with single oil source; the intermediate and heavy oils are relatively far from it, the former is mixed oil, the latter is highly degraded one.

关键词: Junggar basin, Chunguang block, Shawan formation, biomarker, biodegradation, aromatic hydrocarbon, hydrocarbon migration

Abstract: In order to ascertain the oil-gas origin in Chepaizi area in northwestern margin of Junggar Basin, this paper studies the 40 crude oil samples from the Miocene Shawan formation in Chunguang block of the basin using GC-MS analysis, and presents the distributions and compositions of aromatic hydrocarbons biomarker, as well as their geological and geochemical implications. There are abundant aromatic hydrocarbons detected in Shawan crude oil, which can be regarded as an important basis for the judgement of organic matter maturity, kerogen type, hydrocarbon charge and migration direction. The study shows that the Shawan crude oil is in mature stage, formed in continental oil environment, and its kerogen contains a certain extent of input higher plants, and there exist some differences among precursors for different types of crude oils. According to the RPN and m(4-MDBT)/m(1-MDBT), the Shawan crude oil in this area is originated from WS to ES directions, and characterized by that the light crude is close to hydrocarbon source area, with single oil source; the intermediate and heavy oils are relatively far from it, the former is mixed oil, the latter is highly degraded one.

Key words: Junggar basin, Chunguang block, Shawan formation, biomarker, biodegradation, aromatic hydrocarbon, hydrocarbon migration

YIN Qin, YAN Yongxin, WANG Yong, JIA Xiurong, JI Tiantian, MA Rongfang. Geochemical Characteristics of Aromatic Hydrocarbons in Crude Oil of Shawan Formation in Chunguang Block, Northwestern Margin of Junggar Basin[J]. 新疆石油地质, 2016, 37(zk(English) ): 8-13.

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