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作为煤系烃源岩中重要的无机组分,含铁矿物对有机—无机相互作用和油气生成具有重要意义。对褐煤样品添加不同含铁矿物的加热模拟实验结果显示,菱铁矿对气态烃和液态烃(氯仿沥青“A”)均有催化作用,其中甲烷、气态C+4、液态饱和烃和非烃产率增加较显著。与菱铁矿一样,赤铁矿也能促进气态烃产率的增加,但却使褐煤液态烃的生成高峰推迟(350℃推迟至375℃),且在450℃及其之后对液态烃的生成表现为抑制作用。应用穆斯堡尔谱对实验前后样品中铁元素化学种检测发现,从375℃开始,赤铁矿在褐煤生烃的过程中被还原为磁铁矿(Fe3O4)。菱铁矿在450℃的加热模拟实验后变成磁铁矿(Fe3O4)。其本质说明含铁矿物在中低温阶段对褐煤生烃具有吸附—催化作用,而在中高温阶段与有机质发生复杂的有机—无机反应。
As an important inorganic component in coal-based source rocks, iron-bearing minerals are of great significance for organic-inorganic interaction and hydrocarbon generation. The results of heating simulation for adding different iron minerals to lignite samples show that siderite has the catalytic effect on both gaseous hydrocarbons and liquid hydrocarbons (chloroform pitch “A”), of which methane, gaseous C + 4, liquid saturated hydrocarbons And non-hydrocarbon yield increased more significant. Hematite, like siderite, can also contribute to an increase in the yield of gaseous hydrocarbons, but delaying the peak of lignite liquefaction (350 ° C postponed to 375 ° C) and the formation of liquid hydrocarbons at 450 ° C and thereafter The performance of inhibition. The application of Mossbauer spectroscopy to the determination of iron chemical species in samples before and after the experiment showed that from 375 ℃, the hematite was reduced to magnetite (Fe3O4) during the process of lignite hydrocarbon generation. Siderite turns into magnetite (Fe3O4) after heated simulation experiment at 450 ℃. Its essence shows that the iron-bearing minerals have the adsorption-catalysis effect on lignite hydrocarbon generation in the mid-low temperature stage and complicated organic-inorganic reactions with the organic matter in the mid-high temperature stage.