准噶尔盆地南缘四棵树凹陷油气成因

doi:10.7657/XJPG20200104

摘要/Abstract

摘要：

准噶尔盆地南缘四棵树凹陷目前发现的原油主要为轻质原油,伴生湿气,但在不同区域油气性质有差异,在油气源认识上存在争议。选取南缘露头剖面中—下侏罗统和中—上三叠统烃源岩样品,进行岩石热解、氯仿沥青A、气相色谱、有机岩石学等分析,结合钻揭烃源岩的地球化学分析数据,分析四棵树凹陷三叠系、侏罗系和古近系烃源岩的地球化学性质,确立烃源岩有机相,探讨油气成因和来源。结果表明,四棵树凹陷轻质油气主要来自下侏罗统八道湾组富壳质组的烃源岩,还可能来自中—上三叠统烃源岩;独山子油田和西湖背斜新近系原油主要来自侏罗系或三叠系烃源岩,部分来自古近系安集海河组烃源岩。

关键词: 准噶尔盆地, 四棵树凹陷, 轻质原油, 烃源岩, 有机相, 油气成因

Abstract:

The oil found in the Sikeshu sag in the southern margin of Junggar basin is the light oil with associated wet gas, but the properties of the oil and gas in different regions are different and there are some disputes about the hydrocarbon sources. The samples of the Middle-Lower Jurassic and Middle-Upper Triassic source rocks obtained from the oucrops in the southern margin are selected. Based on the analysis of rock pyrolysis, choloroform asphalt A, gas chromatography and organic petrology and combined with geochemical analysis of the source rocks, the paper analyzes the geochemical properties of the source rocks of Triassic, Jurassic and Paleogene in the Sikeshu sag, determines the organic phases of the source rocks and discusses the genesis and origin of the oil and gas. The study results show that the light oil and gas in the Sikeshu sag mainly come from the source rocks of the Lower Jurassic Badaowan formation, probably from the Middle-Upper Triassic source rocks; the oil in Dushanzi oilfield and the Neogene Xihu anticline mainly comes from Jurassic or Triassic source rocks, partial oil from the source rocks of the Paleogene Anjihaihe formation.

Key words: Junggar basin, Sikeshu sag, light oil, source rock, organic phase, hydrocarbon genesis

中图分类号:

TE112.111

任江玲, 王飞宇, 赵增义, 张韵佩, 米巨磊, 刘翠敏. 准噶尔盆地南缘四棵树凹陷油气成因[J]. 新疆石油地质, 2020, 41(1): 25-30.

REN Jiangling, WANG Feiyu, ZHAO Zengyi, ZHANG Yunpei, MI Julei, LIU Cuimin. Genesis of Oil and Gas in Sikeshu Sag in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 25-30.

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