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晋县凹陷赵芯2井(2459m,E2k)低熟蒸发岩样品中检出了异常分布的C22-C27甾烯和C24-C30四环萜烷(17,21-断藿烷),但在同井更深、成熟度相对更高的沉积物中并未检出。实测镜质组反射率Ro=0.43%以及芳烃馏分中有高丰度的苯并噻吩和多烷基化的二苯并噻吩,说明热催化作用成因是不可能的,微生物参与成为最可能的生成途经。沉积抽提物未显示出常规生物降解的痕迹,因此这些化合物很可能是在早期成岩阶段特定微生物作用的结果。该区油样中检出的C21-C29甾烷的特征与同时检出的C22-C27甾烯特征一致,进一步表明微生物作用的可能性;高丰度的C24-C30四环萜烷(17,21-断藿烷)和常规藿烷、甲基藿烷相匹配,以及高丰度的C22-C27甾烯和规则甾烷缺失相匹配,特别是芳烃馏分中多取代二苯并噻吩类有机含硫化合物的检出,均表明异常分布的C22-C27甾烯与C24-C30四环萜烷类似,很可能是早期成岩阶段微生物改造作用下的产物。
Abnormally distributed C22-C27 steroidal and C24-C30 tetracyclic terpanes (17,21-selenoethane) were detected in the low-mature evaporite samples of Zhao2 core well (2459m, E2k) The wells were deeper and were not detected in sediments of relatively higher maturity. The measured vitrinite reflectance Ro = 0.43% and benzofluorene and polyalkylated dibenzothiophene with high abundance in the aromatic fraction indicate that the genesis of thermal catalysis is not possible and that microbial involvement is the most probable formation via. Sedimentary extracts did not show traces of conventional biodegradation, so these compounds are likely to be the result of the action of specific microorganisms during the early diagenesis stage. The characteristics of C21-C29 steranes detected in the oil samples of this area are consistent with the identities of C22-C27 steranes detected simultaneously, further demonstrating the possibility of microbial action. Highly abundant C24-C30 tetracyclic terpanes (17, 21-secachiane) and conventional hopane, methyl hopane matching, as well as the abundance of C22-C27 steroidal steranes and regular stromal lack of match, in particular the aromatic fraction of dibenzothiophenes organic substituted with The detection of sulfur compounds showed that the abnormal distribution of C22-C27 steroid was similar to that of C24-C30 tetracyclic terpane, which is probably the result of microbial transformation in the early diagenetic stage.