摘要
在封闭体系的条件下,对典型的Ⅰ、Ⅱ、Ⅲ型干酪根在热演化过程中的损失进行生烃动力学研究,获得了Ⅰ、Ⅱ、Ⅲ型干酪根的总量、有机碳、氢以及氮质量损失动力学参数。用Kinetics软件计算了封闭体系干酪根有机碳丰度、氢碳原子比和氮碳原子比的恢复系数。认为在对高成熟—过成熟干酪根进行生烃评价时,Ⅰ、Ⅲ型干酪根残余有机碳丰度需要进行恢复,而Ⅱ型干酪根残余有机碳丰度不需要恢复。三种类型干酪根的氢碳原子比均需要进行恢复。
It is described on kinetics of kerogen transformation in closed system by means of heating simulation in laboratory. The kinetic parameters for transformation of kerogen, including Types Ⅰ ,Ⅱ and Ⅲ, and their organic carbon, hydrogen and nitrogen,were determined. Using commercial available Kinetics software,the obtained kinetic parameters were applied to calculate recovery coefficients of organic carbon abundance,atomic H/C and N/C ratios in kerogens. The result shows that at the range of Ro from 0.20% to 4.45%, the recovery coefficients of organic carbon, total amount of carbon, hydrogen and nitrogen,atomic of H/C and N/C ratios for Type Ⅰ kerogen are respectively from 1.00 to 1.12, from 1.00 to 1.16, from 1.00 to 4.93, and from 1.00 to 1.24; while the coefficients for Type Ⅱ kerogen are respectively from 0.96 to 1.01 , from 1 to 1.11, from 1 to 4.98, and from 1 to 1.39; and the coefficients for Type Ⅲ kerogen are respectively from 0.62 to 1.00, from 0.88 to 1.00, from 1.00 to 1.51, and from 1.00 to 1.50. In term of above dada, it is concluded that abundance of residual organic carbon must be recovered when the potential of hydrocarbon generation are estimated at high or over mature stage for Types Ⅰ and Ⅲ kerogen while the abundance of residual organic carbon is unnecessary to be recovered for Type Ⅱ kerogen. Atomic H/C ratio needs to be recovered for all types of kerogen. These kinetic data provided are useful to calculate the amount of original organic matter, organic carbon, hydrogen and nitrogen in source rocks at closed system in sedimentary basins.
出处
《海相油气地质》
2008年第2期27-36,共10页
Marine Origin Petroleum Geology
基金
国土资源部油气战略选区项目(编号:XQ-2004-03-05)资助
关键词
烃源岩评价
生烃动力学
封闭体系
有机质恢复
有机碳丰度
残留干酪根
氢碳原子比
Source rock evaluation
Kinetics of kerogen transformation
Closed system
Recovery of organic matter
Remnant kerogen
Organic carbon abundance
Atomic H/C ratio
