论文部分内容阅读
本文以干酪根镜下鉴定为基础,结合元素、红外光谱及有机差热的分析资料,将岩石干酪根划分为腐泥、腐殖、混合三种类型。腐泥型干酪根的红外谱图特征是:反映C-H基团峰(2920cm~(-1))高,含氧基团峰(1700cm~(-1))低,该两峰比值大于2.5。腐殖型的上述两峰比值小于1.5。腐泥型干酪根元素分析的H/C值为1.31,腐殖型的H/C平均值为0.85,接近于煤的0.70。混合型干酪根上述特征皆介乎腐泥、腐殖二者之间。干酪根的差热图谱呈双峰形,前峰温度值多小于400℃,后峰温度值在500℃左右,前后两峰的比值及热失重值,皆随干酪根炎型及其成熟度的差异而变化。辽河拗陷下第三系干酪根的地球化学和光学特征,深水湖相沉积以腐泥型干酩根为主。干酪根类型主要控制因素之一是有机质性质,而原始有机质特点与沉积环境密切相关。
Based on the identification of kerogen microscopy, the kerogen is divided into three types: sapropel, humus and mixture by analyzing the data of elements, infrared spectra and organic differential thermal analysis. The results of the infrared spectroscopy of sapropelite kerogen indicate that the peak of C-H group (2920cm -1) is high and the peak of oxygen-containing group (1700cm -1) is low, the ratio of these two peaks is more than 2.5. Humic type of the above two peaks ratio is less than 1.5. The elemental analysis of sapropel kerogen showed a H / C value of 1.31 and a humic H / C average of 0.85, which was close to 0.70 for coal. Mixed kerogen These characteristics are between sapropelic, humus between the two. The differential thermal profile of kerogen showed a bimodal shape, the temperature of the former peak was less than 400 ℃, the temperature of the latter peak was about 500 ℃, the ratio of the two peaks before and after the endotherm and the value of the weight loss of heat were all related to the kerogen type and its maturity Difference and change. The geochemical and optical characteristics of the kerogen in the Liaohe depression are mainly dominated by saprolite-type stems. One of the main controlling factors of kerogen type is organic matter, while the characteristics of the original organic matter are closely related to sedimentary environment.