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基于40余个芳烃组分的GC-MS及相关分析资料,阐明了四川盆地北部上三叠统须家河组煤系烃源岩在成熟晚期到过成熟阶段(Ro=1.13%~2.85%)芳烃组成的热演化特征,并剖析了适用于高-过成熟烃源岩有机质生源和沉积环境判识的芳烃指标.研究结果表明,在高热演化阶段这些烃源岩中低碳环数的萘及菲系列随成熟度增高而减少,而、苯并萤蒽、苯并[e]芘等高碳环数化合物逐渐相对富集,且母体化合物趋于增多,是高地温条件下的裂解和持续的脱氢作用所引起的聚合反应所致.它们的MPI1值随成熟度(Ro)呈两段式线性变化趋势,在Ro<1.80%时随之升高,Ro>1.8%时降低,两者的关系式分别为Ro=0.98MPI1+0.37和Ro=-0.90MPI1+3.02,不同于前人的结果.当Ro值高于1.1%时二苯并呋喃类化合物开始急剧减少,导致芳烃三芴系列组成发生显著变化,因而不适用于高-过成熟煤系烃源岩的沉积环境识别.4-/1-MDBT比值可作为反映有机相变化的有效指标,能区分高成熟煤与泥岩.2,6-/2,10-DMP,1,7-/1,9-DMP比值和三芳甾烷丰度可作为高演化烃源岩的有机质生物源参数,能指示陆源输入与水生生物贡献的大小.
Based on the GC-MS and related analysis data of more than 40 aromatic constituents, it is elucidated that the source rocks of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin were mature from late mature stage (Ro = 1.13% -285%), Aromatics composition and analyzes the aromatics index which is suitable for the identification of organic matter source and sedimentary environment of high-over mature hydrocarbon source rocks.The results show that in the high thermal evolution stage, the low carbon ring naphthalene and Phenanthrene series decreased with the increase of maturity. However, higher carbon ring compounds such as benzofluoranthene and benzo [e] pyrene gradually became relatively enriched, and the parent compounds tended to increase, which was the result of pyrolysis and persistence under high geothermal conditions Dehydrogenation caused by the polymerization reaction.Their MPI1 values with the maturity (Ro) showed a two-stage linear trend, with Ro <1.80%, followed by Ro> 1.8%, both decreased The relationship is Ro = 0.98MPI1 + 0.37 and Ro = -0.90MPI1 + 3.02, respectively, which is different from the previous results. When Ro value is higher than 1.1%, the dibenzofurans begin to decrease drastically, Which is not suitable for the identification of sedimentary environment of high-over-mature coal-derived source rocks.4-1 / 1-MDBT ratio Which can be used as an effective index to reflect the change of organic phase and distinguish between high-mature coal and mudstone.The ratio of 2,6-, 2,10-DMP, 1,7- / 1,9-DMP and the abundance of triarylstannane can be regarded as high evolution The organic source biogenic source parameters of source rocks indicate the contribution of terrestrial inputs and aquatic organisms.