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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。
The distribution of hydrocarbon source rocks in the Lower Paleozoic, especially carbonate rocks, is very widespread. However, the geochemical evaluation of carbonate rocks has been a weak link. One of the important reasons is that the overripe maturity of carbonate rocks , Its geochemical parameters is difficult to be accurate. In this paper, we use G.quisca kerogen with universal distribution in Ordovician hydrocarbon source layer to conduct pyrolysis experiments, and a series of chemical reaction kinetic parameters (activation energy E, pre-exponential factor A With the degradation rate X), these parameters have a significant reference for the correct evaluation of the Lower Paleozoic carbonate rock formation hydrocarbon potential and hydrocarbon generation and expulsion history.