Maturation evaluation of insoluble organic matter using FT-IR microspectroscopy and its application to sedimentary basin analysis

干酪根成熟度的评价对油气勘探具有重要意义。红外光谱（IR）是干酪根显微组分表征的重要手段，其吸收谱带可以提供干酪根显微组分的化学键、官能团和相应的振动信息，本文旨在建立干酪根显微组分（包括化石）的显微傅立叶变换红外光谱（Micro-FT-IR）。花粉以获得单个显微组分的显微特征。透射-反射光谱可以在放置在铝涂层板上的样品颗粒上测量。为了测量透射光谱，将样品在两个KBr盘之间以180 kg/cm ^2的压力压缩，以获得平坦度。本研究的另一个目的是利用FT-IR同时确定干酪根的类型和成熟度。对用镜质组反射率法测定成熟度的干酪根样品进行了红外漫反射光谱分析。以FT-IR光谱的1710 cm ^<-1>（C=O）、1610 cm ^<-1>（C=C）和1460 cm ^<-1>（CH_2 + CH_3）为顶点，用镜质组反射率数据绘制了三种干酪根的演化路径三角图。这些FT-IR研究可以应用于干酪根成熟度的评价，从而应用于沉积盆地分析。

Many parameters have been developed to evaluate the maturity of kerogen, which is important for petroleum exploration. Infrared (IR) spectroscopy is used extensively in the characterization of kerogen, and the absorption bands give useful information on chemical bonding, functional groups and corresponding vibration.The purpose of this study is to develop a Fourier transform infrared microspectroscopy (Micro-FT-IR) for kerogen macerals, including fossil. pollen to obtain microscopic characterization of individual macerals. Transmission-reflection spectra can be measured on the sample particles placed on an aluminum-coated plate. For, the measurement of transmission spectra, the sample is compressed between two KBr discs at a pressure of 180 kg/cm^2 to obtain flatness. These procedures make it possible to take beautiful FT-IR spectrit.The other purpose of this study is to determine both the type and maturation degree of kerogen at the same time using FT-IR. Heating experiments were conducted on the three types (I, II, and III) of kerogens to simulate the maturation process. Diffusion reflectance spectra of FT-IR were taken on the heated kerogen samples of which maturation degrees had been determined by the vitrinite reflectance method. Evolution paths of the three types of kerogen were shown on a triangular diagram with vitrinite reflectance data in which the apices are 1710cm^<-1> (C=O), 1610cm^<-1> (C=C) and 1460cm^<-1> (CH_2 + CH_3) of FT-IR spectra. These FT-IR studies can be applied to evaluation of kerogen maturation which results in an application to sedimentary basin analysis.