藻干酪根在碳酸盐岩与泥岩中成烃特征对比

COMPARISON OF THE HYDROCARBON GENERATING CHARACTERISTICS OF ALGAE KEROGEN IN CARBONATE ROCK AND IN MUDSTONE

通过加水热模拟分析了藻干酪根在碳酸盐岩和泥质岩介质下成烃特征的异同。碳酸盐岩与泥质岩液态产物族组成的饱和烃气相色谱及固体干酪根的特征仅有微弱差异；在泥质岩加水介质中的气体产率明显小于碳酸盐岩，其主要原因在于碳酸盐岩介质中大量ＣＯ２的形成；粘土矿物对气态烃的催化作用具体表现为把不饱和的烃类通过加氢催化转化为饱和烃类，对低分子的甲烷表现出较为明显的催化效应；碳酸盐岩则对于不饱和烃和甲烷的催化作用不如粘土岩，但对较重气态烃的生成却比较有利。在大量生油之前碳酸盐岩生油量高于泥质岩，生油高峰时两者总液态产物产率几乎相等，泥质岩生油高峰与碳酸盐岩基本一致或稍晚。

Abstract By means of hydrothermal simulation,the similarities and differences of the hydrocarbon generating characteristics of algae kerogen in the media of carbonate rock and mudstone are analysed.There are small differences in the hydrocarbon compositions of liquid products,the gas chromatograms of saturated hydrocarbons and the characteristics of solid kerogen between carbonate rock and mudstone.The gas yield is obviously small in the medium of mudstone and water than in that of carbonate rock and water.The main reason is that a great amount of CO 2 are formed in the medium of carbonate rock.The catalysis of clay mineral on gaseous hydrocarbons is revealed specifically by the fact that unsaturated hydrocarbons change into saturated hydrocarbons through hydrogen addition catalysis.This is more effective for low molecular methane.The catalysis of carbonate rock to unsaturated hydrocarbons and methane is not so good as mudstone.But it is more favourable to the generation of heavier gaseous hydrocarbons.Before the time to generate a great amount of oil,the oil generating amount of carbonate rock is high than that of mudstone.At the time of oil generating peak,the total liquid products of the both are almost equal.The oil generating peak of mudstone is generally consistent with or slightly later than that of carbonate rock.