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单个油包裹体和微区沥青显微红外光谱分峰拟合技术及应用
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  • 英文篇名:Curve-Fitting Analysis of Micro FT-IR and Its Application on Individual Oil Inclusion and Micro-Area Bitumens
  • 作者:王倩茹 ; 陈红汉 ; 胡守志 ; 赵玉涛 ; 陈慧钦
  • 英文作者:Wang Qianru;Chen Honghan;Hu Shouzhi;Zhao Yutao;Chen Huiqin;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences;Jilin Oil Field Exploitation Research Institute,PetroChina;
  • 关键词:显微红外光谱 ; 分峰拟合 ; 单个油包裹体 ; 微区沥青 ; 志留系 ; 塔里木盆地 ; 石油地质.
  • 英文关键词:micro FT-IR;;curve-fitting analysis;;individual oil inclusion;;micro-area bitumen;;the Silurian;;Tarim basin;;petroleum geology
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:中国地质大学构造与油气资源教育部重点实验室;中国石油天然气股份有限公司吉林油田分公司勘探开发研究院;
  • 出版日期:2016-11-15
  • 出版单位:地球科学
  • 年:2016
  • 期:v.41
  • 基金:国家重点基础研究发展计划“973”项目(No.2012CB214804);; 中国地质大学(武汉)教学实验室开放基金项目(No.skj2014001)
  • 语种:中文;
  • 页:DQKX201611008
  • 页数:14
  • CN:11
  • ISSN:42-1874/P
  • 分类号:123-136
摘要
针对单个油包裹体和储层沥青等结构复杂样品傅里叶变换显微红外光谱吸收峰严重重叠的问题,基于高斯、洛伦茨函数或其组合(高斯-洛伦茨)模型理论,采用显微红外分峰拟合技术,对塔中北坡顺托果勒地区单个油包裹体成熟度和储层沥青成因进行了系统分析,并取得了4点认识:(1)通过与Pironon对合成油包裹体的峰位坐标区域化划分吸收峰对比,认为分峰拟合技术更为真实地反映各子峰的面积,而且能够识别重叠区"隐蔽"的吸收峰,有助于准确判别有机质的结构组成;(2)高斯、洛伦茨函数或其组合(高斯-洛伦茨)模型拟合子峰时,高斯-洛伦茨函数分布拟合的吸收峰与实测光谱吻合度较高,噪音目标越低拟合效果越好,但计算耗时越长,故优选噪音目标在1~10高斯-洛伦茨函数分布拟合各子峰;(3)结合流体包裹体系统分析和均一温度-埋藏史投影法,单个油包裹体显微红外参数(CH2a/CH3a、Xinc、Xstd等)揭示塔中北坡顺托果勒地区存在3期油充注,分别为加里东晚期、晚海西期和喜山期;(4)显微红外光谱定量化分析是研究储层沥青多成因化和多期次油气充注叠加作用的有效手段,分析结果说明塔中北坡顺托果勒地区储层沥青经历了生物降解、氧化降解和水洗淋滤作用.
        Curve-fitting analysis of micro FT-IR,in the theory of Gaussian,Lorentz function or their combination(GaussianLorentz)model,can break through the limit of overlapping spectra resulting from complicated structures of samples(e.g.individual oil inclusion and bitumens).Hence,curve-fitting analysis of micro FT-IR was used for analyzing maturity of individual oil inclusion and the origin of bitumens in Shuntuoguole area of Tazhong northeastern slope systematically,and four conclusions have been obtained:firstly,curve-fitting analysis of micro FT-IR may be more accurate for calculating absorption peaks,and some easily neglected peaks can be detected by this method in contrast with the method of interval oriented by Pironon.Secondly,Gaussian-Lorentz fitting is more approaching to actual spectra and the lower noise level is corresponding to better fit but requiring longer computation time.As a result,Gaussian-Lorentz fitting with 1~10noise level is preferred.Thirdly,based on inclusion system analysis and burial history projection with homogenization temperature,infrared parameters(e.g.CH_(2a)/CH_(3a),Xincand Xstd)reveal three hydrocarbon charging events occurred,including Late Caledonian,Late Hercynian and the Himalaya.Finally,micro FT-IR is an effective means for analyzing multi-hydrocarbon charging events and complicated origin of bitumens undergoing biodegradation,oxidative degradation and water eluviation quantitatively in study area.
引文
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