【摘要】 在金管限定体系温度500℃、压力50 MPa、恒温72 h的条件下,对高演化寒武系玉尔吐斯组和奥陶系萨尔干组干酪根开展了干酪根、干酪根+Ni系金属（Ni、NiO、NiS₂）、干酪根+供氢剂NaBH₄、干酪根+Ni系金属+供氢剂NaBH₄的高温热解产气实验。干酪根+Ni系金属热解生成的甲烷略低于单独干酪根,表明金属催化剂对甲烷生成有轻微抑制作用;玉尔吐斯组和萨尔干组干酪根+供氢剂NaBH₄热解生成的气态烃(∑C_1～5)总产率分别是单独干酪根的12.8和9.8倍,表明充足的H源供应能够使高演化干酪根中的残余有机质继续裂解生烃;与玉尔吐斯组和萨尔干组干酪根+供氢剂NaBH₄相比,干酪根+Ni系金属+供氢剂NaBH₄系列具有更高的湿气(∑C_2～5)产率,分别是只加入供氢剂的6.4～16.1和4.2～8.0倍。依据Athabasca沥青渣油在富H条件下的转化机理,高演化干酪根加氢催化裂解生烃的可能机理为:高演化干酪根大分子在热力作用下裂解生成芳烃自由基,随后在H₂作用下持续加氢生成环烷烃;环烷烃在H₂、高温高压、金属催化剂的作用下发生开环裂解生成低碳数气态烃。更多还原

【Abstract】 Pyrolysis experiments of kerogen,kerogen+Ni group metals （Ni,NiO,NiS₂）,kerogen+NaBH₄ （hydrogen donor） and kerogen+Ni group metals+NaBH₄ were conducted on the highly mature Cambrian Yuertusi kerogen/Ordovician Salgan kerogen under a fixed pressure of 50 MPa at 500℃for 72 h.The results showed that the methane generated by the pyrolysis of kerogen+Ni group metals was slightly lower than that by kerogen alone,indicating that the single metal catalysts slightly inhibited methane generation.The yield of total gaseous hydrocarbon (∑C_1～5) from the pyrolysis of Yuertusi/Salgan kerogen+NaBH₄ was 12.8 and 9.8 times higher than that from kerogen alone,respectively,indicating that sufficient hydrogen supply could catalyze the highly mature kerogens to continue to generate significant quantities of hydrocarbons.Kerogen+Ni group metals+NaBH₄ had higher wet gas yields (∑C_2～5) than did Yuertusi/Salgan kerogen+NaBH₄,which were 6.4 to 16.1 and 4.2 to 8.0 times higher than that of kerogen+NaBH₄.Based on the proposed hydrocarbon generation mechanism of Athabasca asphalt residue under hydrogen-rich conditions,we explained the possible hydrocarbon generation mechanism of highly mature kerogen using a hydrogen donor （NaBH₄）.The highly mature kerogen macromolecules were cracked to generate aromatic free radicals and then hydrogenated continuously to generate naphthenes in the presence of hydrogen.The ring of the naphthenic was opened to generate chain hydrocarbon free radicals,which continue to generate gaseous hydrocarbons through thermal cracking.更多还原