Evaluation of a Simple Model of Vitrinite Reflectance Based on Chemical Kinetics
Evaluation of a Simple Model of Vitrinite Reflectance Based on Chemical Kinetics
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DOI：
10.1306/0c9b251f-1710-11d7-8645000102c1865d
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发表时间：
1990-10
期刊：
影响因子：
3.5
通讯作者：
J. Sweeney;A. Burnham
中科院分区：
文献类型：
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作者：
J. Sweeney;A. Burnham
基于镜质组成分随时间和温度的变化，我们提出了一个简化版的镜质组成熟模型，并附有样品电子表格。该简化模型称为EASY%R[o]，采用具有活化能分布的阿伦尼乌斯一阶平行反应方法。根据煤镜质组的化学性质，EASY%R[o]已被校准为更严格的镜质组成熟模型。使用EASY%R[o]，如果估计了某一地层的时温历史，就可以得到该地层的镜质组反射率随时间的剖面。当应用于多个地层水平时，EASY%R[o]可用于计算镜质组反射率随深度的百分比剖面，以便与钻井数据进行比较，并优化热历史模型。EASY%R[0]可用于测量镜质组反射率值为0.3至4.5%，以及从实验室（1摄氏度/周）到缓慢沉降地质盆地（1摄氏度/10立方米）的升温速率。模型应用的例子范围从被火成岩侵入加热的沉积岩到各种埋藏史。将EASY%Ro预测的镜质组成熟度与目前使用的其他方法（如Lopatin时间-温度指数、有机成熟度水平和其他使用单一活化能的方法）进行比较。我们的模型成功地估计了由于沉积岩在各种盆地背景下被火成岩侵入、地热流体和埋藏加热的热变质作用而产生的镜质组反射率。
We present a simplified version of a vitrinite maturation model, complete with sample spreadsheet, based on changes in vitrinite composition with time and temperature. The simplified model, called EASY%R[o], uses an Arrhenius first-order parallel-reaction approach with a distribution of activation energies. EASY%R[o] has been calibrated to a more rigorous model of vitrinite maturation based on the chemical properties of coal vitrinite. With EASY%R[o], a profile of vitrinite reflectance vs. time can be obtained for a given stratigraphic level if the time-temperature history for that level has been estimated. When applied to multiple stratigraphic levels, EASY%R[o] can be used to compute profiles of the percent of vitrinite reflectance with depth for comparison with borehol data and to optimize thermal history models. EASY%R[o] can be used for vitrinite reflectance values of 0.3 to 4.5%, and for heating rates ranging from those in the laboratory (1 degree C/week) to those in slowly subsiding geologic basins (1 degree C/10 m.y.). Examples of model applications range from sedimentary rocks heated by an igneous intrusion to a variety of burial histories. Vitrinite maturation predicted by EASY%Ro is compared to other methods currently being used, such as the Lopatin time-temperature index, level of organic maturity, and other approaches using a single activation energy. Our model successfully estimates vitrinite reflectance due to thermal metamorphism of sedimentary rocks heated by igneous intrusions, geothermal fluids, and burial in a variety of basin setting .