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在研究天然气储层沥青生物标志化合物特征时发现,C_(29)甾烷成熟度指标20S/20(S+R)、ββ/(ββ+αα)在高、过成熟阶段发生“倒转”,比值远低于其平衡值,也低于成熟度低的样品。结合前人的热模拟实验,讨论了高、过成熟阶段C_(29)甾烷成熟度指标“倒转”的原因及“倒转”特征在判断天然气成藏时期上的利用。
When studying the characteristics of biomarkers of asphalt biogenic compounds in natural gas reservoirs, it was found that the maturity index of C 29 steranes was “reversed” at 20S / 20 (S + R) and ββ / (ββ + αα) Far below their equilibrium values and below the low maturity samples. Combined with the thermal simulation experiments of predecessors, the causes of “inversion” of C 29 sterane maturity in high and over mature stages and the utilization of “inverted” character in judging natural gas accumulation period are discussed.