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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.
Aiming at the serious overlap of the FTIR spectra of complex samples with single oil inclusions and reservoir bitumen and so on, based on the theory of Gaussian, Lorentz or their combination (Gauss-Lorentz) model, Micro-infrared fractional fitting technique was used to systematically analyze the maturity of individual oil inclusions and the origin of reservoir asphalt in Shuntuogele area on the northern slope of the Tarim Basin and to obtain 4 points: (1) The peak coordinates of the inclusions are divided into several regions, which is considered as the most accurate representation of the area of each sub-peak, and can identify the absorption peak of the “hidden” region in the overlap region, which helps to accurately identify the organic matter (2) Gaussian-Lorentz function or its combination (Gauss-Lorentz model) fitted the sub-peak, the Gaussian-Lorentz function distribution fitting peak and the measured spectra of high agreement, The lower the noise target is, the better the fitting effect is, but the longer the calculation time is. Therefore, it is preferable that the noise target fits the Gaussian-Lorentz function distribution of 1 ~ 10 for each sub-peak. (3) Combining with the fluid inclusion system analysis and the uniform temperature Burial history projection method and microscopic infrared parameters of single oil inclusion (CH2a / CH3a, Xinc, Xstd, etc.) revealed that there were three stages of oil filling in the Shuntuogele area on the northern slope of the tower, namely Caledonian, Late Hercynian and Himalayan periods respectively; (4) Quantitative The analysis is an effective means to study the multi-genesis of reservoir bitumen and the superimposition of multi-period hydrocarbon filling. The analysis results show that the reservoir bitumen in Shuntuogele area on the north slope of the tower undergoes biodegradation, oxidative degradation and water-washing leaching .