西藏羌塘盆地扎仁地区白云岩油苗地球化学特征

新疆石油地质 ›› 2008, Vol. 29 ›› Issue (2): 214-218.

西藏羌塘盆地扎仁地区白云岩油苗地球化学特征

陈文彬¹, 廖忠礼¹, 刘建清¹, 付修根¹, 熊兴国², 贺永忠²

1.中国地质调查局成都地质矿产研究所, 成都610082;
2.贵州省地质调查研究院, 贵阳550005

收稿日期:2007-09-12 发布日期:2020-08-17
作者简介:陈文彬(1979-), 男, 湖北孝感人, 助理工程师, 地球化学,(Tel)028-83231200(E-mail)cdcwenbin@cgs.gov.cn.
基金资助:
国家油气专项, 青藏高原油气资源战略选区调查与评价(XQ2004-2006)资助

Geochemical Characteristics of Dolomite Oil Seepage in Zar ing Ar ea,Qiangtang Basin of Tibet

CHEN Wen-bin¹, LIAO Zhong-li¹, LIU Jian-qing¹, FU Xiu-gen¹, XIONG Xing-guo², HE Yong-zhong²

1. Chengdu Institute of Geology and Mineral Resources, China Geologic Survey, Chengdu, Sichuan 610082, China;
2. Guizhou Institute of Geological Survey, Guiyang, Guizhou 550005, China

Received:2007-09-12 Published:2020-08-17

摘要/Abstract

摘要： 扎仁地区含油白云岩中油苗饱和烃质量分数较高(5.4%～68.2%), 不含沥青质等。从原油族组成、单体烃碳同位素、生物标记化合物等方面综合分析了原油的地球化学特征。油苗的姥鲛烷/植烷比值低(0.60～0.98), 单体烃碳同位素在-26.88‰～-31.09‰. 甾萜烷参数研究表明, 油苗的成熟度并不是很高, 油苗母岩的沉积环境为还原条件, 母质以细菌和藻类输入为主。运用单体烃碳同位素值和生物标记化合物的相对含量指标进行的油油和油源对比研究表明, 油苗具有相同母源和成因, 油源可能主要为扎仁地区中侏罗统夏里组烃源岩。

关键词: 油苗, 单体烃碳同位素, 生物标志物, 扎仁地区, 羌塘盆地

Abstract: The oil seepages from oil-bearing dolomite in Zaring area of Qiangtang basin are high fraction of saturated hydrocarbons (5.4% ~68.2%)without asphaltene. The geochemical characteristics of oil seepages are analyzed by group component, carbon isotope and biomarker, etc. The results show that they have low values of m (Pr)/m (Ph)by 0.60~0.98, carbon isotope values ranging from -26.88‰ to -31.09‰, not high maturity of the oils, belonging to reductive environment and dominated by microbe and algae parent materials. The relative content index of free hydrocarbon carbon isotope and biomarker and the oil source correlation indicate that the oil seepages were formed by the same source rock and origin. The Xiali source rock of Middle Jurassic in Zaring area could be main source of the oils.

Key words: oil seepage, free hydrocarbon, carbon isotope, biomarker, Zaring area, Qiangtang basin, Tibet

中图分类号:

TE112.116

陈文彬, 廖忠礼, 刘建清, 付修根, 熊兴国, 贺永忠. 西藏羌塘盆地扎仁地区白云岩油苗地球化学特征[J]. 新疆石油地质, 2008, 29(2): 214-218.

CHEN Wen-bin, LIAO Zhong-li, LIU Jian-qing, FU Xiu-gen, XIONG Xing-guo, HE Yong-zhong. Geochemical Characteristics of Dolomite Oil Seepage in Zar ing Ar ea,Qiangtang Basin of Tibet[J]. Xinjiang Petroleum Geology, 2008, 29(2): 214-218.

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