An abnormal assemblage of molecular markers and its geochemical significance in the Da'anzhai Member of the central Sichuan Basin
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摘要:
在川中地区大安寨段烃源岩抽提物中检测出丰富的重排藿烷系列、重排补身烷系列、重排甾烷系列及C26+长链三环萜烷系列的分子标志物组合。结合烃源岩的有机质来源、沉积环境、热演化程度特征，探讨上述甾烷、萜烷分布特征指示的地质地球化学意义。结果表明：重排类化合物与C26+长链三环萜烷系列存在着某些相同的富集途径，重排藿烷系列富集途径多于重排补身烷系列、重排甾烷系列及C26+长链三环萜烷系列; 特殊的甾烷、萜烷分布特征指示，烃源岩中有机质以湖泊内源(藻类和细菌等)为主，形成于范围局限的弱还原环境，高丰度的重排化合物指示，有机质热演化处于成熟阶段。此外，特殊的甾烷、萜烷分布特征还可能指示了特定的酸性粘土矿物、钙质沉积催化和形成环境中发育的特殊生物族群。综上，研究结果对分子标志物异常组合的地球化学应用具有重要的示范意义。
Abstract:An abnormal assemblage of molecular markers was found in the source rock extracts from the Da'anzhai Member in the central Sichuan Basin, including extremely rich in rearranged hopanes, rearranged drimanes, rearranged steranes and C26+ long-chain tricyclic terpanes.Integrated with the organic matter source, depositional environment and source rock maturity, the significance of the above-mentioned special steranes and terpenes assemblages is discussed.The results show that rearranged compounds and C26+ long-chain tricyclic terpanes have the similar enrichment pathways, among which the enrichment pathway of rearranged hopanes is more than that of rearranged drimanes, rearranged steranes and C26+ long-chain tricyclic terpanes.The special assemblages of steranes and terpenes may indicate that the organic matter is mainly contributed by lagoonal autochthonous sources(algae and bacteria, etc.) and formed in a restricted weakly reduction environment.The high abundance of rearranged compounds indicate that the organic matter has been thermally mature.In addition, it may indicate specific acidic clay minerals and calcareous sediments catalysis and special biotic community in the depositional environment.In summary, this study has an important demonstration significance for the geochemical application of abnormal assemblages of molecular markers.
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图 9 川中地区下侏罗统自流井组大安寨段烃源岩各分子标志化合物相对丰度随着成熟度变化关系图解(横向虚线表示低熟-成熟的分界线，竖向虚线表示相对丰度高低的分界线)
Figure 9.
表 1 川中地区下侏罗统自流井组大安寨段烃源岩样品中分子标志物参数
Table 1. Molecular markers parameters of the source rocks from the Da'anzhai member, Lower Jurassic Ziliujing Formation in the central Sichuan Basin
序号 井号 深度/m 层位 岩性 C15RDr/C15Dr C28+29/C21~29TT C30D/C30H Ds/Ns C29甾烷αββ/(ααα+ααβ) Pr/Ph 1 公1 2339.4 大安寨段 泥岩 2.65 0.31 11.91 0.52 0.45 1.43 2 公1 2339.4 大安寨段 泥岩 2.36 0.00 10.61 0.49 0.56 1.44 3 公1 2340.7 大安寨段 泥岩 1.92 0.14 0.46 0.13 0.34 1.48 4 公1 2381.1 大安寨段 泥岩 2.54 0.29 3.44 0.50 0.50 1.47 5 金3 2234.3 大安寨段 泥岩 1.04 0.04 0.97 0.15 0.30 0.82 6 金3 2469.3 大安寨段 泥岩 1.16 0.09 0.00 0.24 0.41 0.48 7 龙岗022-H2 2520.0 大安寨段 泥岩 0.99 0.20 27.12 0.52 0.58 1.60 8 龙岗022-H2 2536.8 大安寨段 泥岩 2.81 0.35 21.27 0.58 0.57 1.50 9 龙岗022-H2 2545.2 大安寨段 泥岩 / 0.06 0.46 0.34 0.42 0.69 10 蓬莱103井 1653.8 大安寨段 泥岩 2.43 0.45 11.34 0.62 0.38 1.62 11 蓬莱103井 1660.5 大安寨段 泥页岩 2.26 0.73 0.29 0.55 0.29 1.43 12 蓬莱103井 1672.5 大安寨段 泥页岩 / 0.18 0.07 0.22 0.40 0.54 13 蓬莱103井 1696.6 大安寨段 泥页岩 2.64 0.15 0.75 0.44 0.61 1.44 14 蓬莱10井 1998.0 大安寨段 泥页岩 1.89 0.32 5.46 0.50 0.66 1.23 15 蓬莱10井 2007.5 大安寨段 泥页岩 2.17 0.28 5.54 0.56 0.56 1.75 16 蓬莱10井 2020.2 大安寨段 泥页岩 1.32 0.13 0.52 0.22 0.68 1.18 17 蓬莱10井 2026.3 大安寨段 泥页岩 2.94 0.34 4.21 0.66 0.66 1.66 18 西28 1977.1 大安寨段 泥岩 2.66 0.15 0.78 0.24 0.50 2.00 19 西28 1980.5 大安寨段 泥岩 3.93 0.24 0.85 0.41 0.47 1.20 20 西28 2015.5 大安寨段 泥岩 3.52 0.30 2.56 0.34 0.39 1.02 21 鲜9 1989.5 大安寨段 泥岩 / 0.10 0.37 0.40 0.97 22 鲜9 1997.1 大安寨段 泥岩 1.02 0.04 0.36 / / 0.88 注：Ds/Ns=重排甾烷/规则甾烷; C30D/C30H=17-(α)-C30重排藿烷/C30正常藿烷; C15RDr/C15Dr=C15重排补身烷/C15补身烷; C28+C29/(C21~29)TT=C28+C29三环萜烷/(C21~29)三环萜烷) 
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