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本帖最后由 yushan 于 2012-5-5 17:22 编辑
题目：Maturity effect on carbazole distributions in source rocks from the saline lacustrine settings, the western Qaidam Basin, NW China
作者：Chunming Zhang , Yuqing Zhang， Chunfang Cai
刊物：Journal of Asian Earth Sciences
摘要：Carbazole distributions and biomarker compositions have been investigated in a series of source rocks
from the Tertiary strata in the western Qaidam Basin, NW China. Typical biomarker signatures, high gam-macerane, high C 35 hopane and low Pr/Ph, indicate a saline lacustrine environment. Maturity parameter C29
sterane aaa S/S + R ranges from 0.06 to 0.58, indicating immature (ca. <0.35) and mature (ca. >0.35)
stages. Significant variations were observed for carbazole distributions with maturation. As for C1-carb-azoles, the relative amounts of 1-MC (methylcarbazole) show a decrease trend in the immature stage and an increase trend in the mature stage, while the other three isomers (2-, 3- and 4-MCs) show a generally opposite change, indicating a ‘‘two-stage’’ variation. As for C2-carbazole isomers, complex variations were observed for their relative amounts, an overall increase for 1,7-DMC (dimethylcarbazole), a slight ‘‘two-stage’’ change for 1,8- and 1,3-DMCs and a marked ‘‘two-stage’’ variation for 2,4-, 2,5- and 2,6-DMCs.Comparison of the distributions of carbazole and benzocarbazoles revealed a preferential generation for benzocarbazoles at high maturity levels. Benzocarbazole ratio a/a + c varies only in a narrow range 0.52–0.61 in the entire maturity range, suggesting limited maturity dependence. The results here support the idea that carbazole distributions have strong maturity effect in a wide maturity range and the ‘‘two-stage’’ variations for some pyrrolic nitrogen isomers may indicate their different geochemical controls between the immature and mature stages.
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