奥陶系烃源层中粘球形藻干酪根活化能参数初步研究

A PRELIMINARY STUDY ON THE ACTIVATION ENERGY PARAMETERS OF GLOEOCAPSOMORPHA KEROGEN IN ORDOVICIAN SOURCE BEDS

我国下古生界烃源层特别是碳酸盐岩地层分布十分广泛，但碳酸盐岩分布区的地球化学评价一直是个薄弱环节，重要原因之一是由于碳酸盐岩的高过成熟性，其地化参数很难取准。本文选用奥陶系烃源层中具有普遍分布意义的低成熟的粘球形藻（Ｇ．ｐｒｉｓｃａ）干酪根进行热解实验，取得了一系列化学反应动力学参数（活化能Ｅ、指前因子Ａ随降解率Ｘ的变化关系），这些参数对正确评价下古生界碳酸盐岩地层的油气潜力和生排烃史具有明显的借鉴作用。

Abstract The distribution of Low Paleozoic source beds,especially carbonate rock strata,is very wide in our country.But the geochemical evaluation for the distributive area of carbonate rocks is always a vulnerable spot.One of the important reasons is that it is difficult to obtain the accurate geochemical parameters due to the high overmaturity of carbonate rocks.In this pater,the lowmatured Gloeocapsomorpha kerogen of general distributive significance in Ordovician source beds is selected for pyrolysis experiment.A series of dynamic parameters(activation energy E,the changing relationship of frequency factor A to degradability X) of chemical reactions obtained have an obvious use for reference to the correct evaluation of oil/gas potential and hydrocarbon generation/hydrocarbon discharging history in Low Paleozoic carbonate rock strata.