川西北地区泥盆系油砂岩地球化学特征及成因

doi:10.7623/syxb201002012

石油学报 ›› 2010, Vol. 31 ›› Issue (2): 253-258.DOI: 10.7623/syxb201002012

川西北地区泥盆系油砂岩地球化学特征及成因

刘春 1 张惠良 1 沈安江 1 乔占峰 1 倪新峰 1 赵学钦 2

1中国石油杭州地质研究院浙江杭州 310023； 2浙江大学地球科学系浙江杭州 310027

收稿日期:2009-02-12 修回日期:2009-04-20 出版日期:2010-03-25 发布日期:2013-10-31
通讯作者: 刘春

Geochemistry characteristics and origin of the Devonian oil-sandstone in the northwest of Sichuan Basin

LIU Chun 1 ZHANG Huiliang 1 SHEN Anjiang 1 QIAO Zhanfeng 1 NI Xinfeng 1 ZHAO Xueqin 2

Received:2009-02-12 Revised:2009-04-20 Online:2010-03-25 Published:2013-10-31
Contact: LIU Chun

摘要/Abstract

摘要：

采用色谱（GC）、色谱质谱(GC-MS)及同位素分析（GC-IRMS）等技术，系统分析了川西北竹园坝地区泥盆系油砂岩分子地球化学特征及成因。结果表明，川西北竹园坝地区泥盆系油砂岩抽提物氯仿沥青“A”的δ¹³ C值和各族组分δ¹³C值都低于-30‰；油砂岩抽提物饱和烃色谱呈驼峰状，除残留部分环烷烃外，绝大部分正构烷烃和支链烷烃均已消失；芳烃含量很低，主要由三环、四环和五环芳烃所组成；低分子量的孕甾烷和三环萜烷都构成强峰群，藿烷以C₂₉为主峰，伽马蜡烷具中等丰度，甾烷具C₂₉优势，经甲基菲指数折算油砂岩中烃类的镜质体反射率为0.83%。结合区内烃源岩生烃史，初步判断该油砂岩是寒武系生油高峰期产物在印支运动期形成的古油藏，经过喜山期再次运移、分配、改造的结果。

关键词: 川西北地区, 泥盆系, 油砂岩, 古油藏, 地球化学特征, 构造运动

Abstract:

The GC, GC-MS and GC-IRMS techniques were used to study the molecule geochemistry characteristics and origin of the Devonian oil-sandstone in the northwest of Sichuan Basin. The study results showed that the δ¹³C values of the chloroform asphalt “A” and various components of the Devonian oil-sandstone extract in Zhuyuanba area of Sichuan Basin were lower than -30‰, and the carbon isotope fractionation effects between the components were weak. The saturated hydrocarbon chromatograph chart of oil-sandstone extract shows the shape of camel shoulder. The major part of n-alkanes and branched chain alkane were vanished besides the remaining partial cycle-alkane, which indicated that hydrocarbon in oil sandstone had suffered the biodegradation. The aromatic hydrocarbon fractions are mainly composed of three-cycle, four-cycle and five-cycle aromatic. The pregnant steroid alkane with the low molecular mass and the tricyclic terpane constitutes the strong peak group. C₂₉is a prominent peak of the hopanoid, and the gammacerane has the medium intensity content. C₂₉ steroid alkane has the advantage to other steroid alkane. According to the correlation between the methyl phenanthrene index (MPI1) and R_o，the maturity parameter R_o of hydrocarbon in the oil-sandstone extract is converted to 0.83%. According to the hydrocarbon-generation history of source rock in this area, the oil-sandstone was the product of oil-generation peak of the Cambrian source rock. Those products were resulted from the ancient hydrocarbon reservoir formed during the Indo Sinian movement period and then suffered migration and transformation during the Himalayan movement.

Key words: northwest of Sichuan Basin, Devonian, oil-sandstone, ancient hydrocarbon reservoir, geochemistry characteristics, tectonic movement

刘春张惠良沈安江乔占峰倪新峰赵学钦. 川西北地区泥盆系油砂岩地球化学特征及成因[J]. 石油学报, 2010, 31(2): 253-258.

LIU Chun ZHANG Huiliang SHEN Anjiang QIAO Zhanfeng NI Xinfeng ZHAO Xueqin. Geochemistry characteristics and origin of the Devonian oil-sandstone in the northwest of Sichuan Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(2): 253-258.

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川西北地区泥盆系油砂岩地球化学特征及成因

Geochemistry characteristics and origin of the Devonian oil-sandstone in the northwest of Sichuan Basin

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