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通过对南黄海中部海底表层沉积物进行了GC-FID和GC-MS测试分析,研究沉积物有机质中分子地球化学组成特征及其地球化学意义。研究结果显示,研究区表层沉积物正构烷烃气相色谱图(图1)可分3类:后峰型,MH(主峰碳)为C_(27),C_(29),奇偶优势明显;双峰型和中间型。LMW/HMW小于0.2,主频为0.07~0.09,表明沉积有机质主要来源于陆源高等植物。植物蜡正构烷烃组成和分布特征(图2)表现出明显的锯齿型,以C_(29)和C_(31)为主要化合物,说明植物蜡的贡献占优,而人文活动或工业污染的可能性较少。类异戊二烯烃中植烷占优势,沉积物在保存条件较好的还原环境下沉积的甾炕化合物(C_(29)20S/(20S+20R),C_(29)αββ/(ααα+αββ))(图3)和萜类化合物(C_(31)22S/(22S+22R)、霍烷/莫烷)均反映了有机质低熟一成熟特征,表明沉积物中有机质可能与深部油气渗漏有关。
Based on the GC-FID and GC-MS analysis of the seabed sediments in the central part of the southern Yellow Sea, the molecular geochemical characteristics of the sediment organic matter and its geochemical significance were studied. The results show that gas chromatogram of n-alkanes in surface sediment of the study area can be divided into three types: the posterior peak type, MH (main peak carbon) C_ (27), C_ (29) Type and intermediate type. The LMW / HMW is less than 0.2 and the dominant frequency is 0.07 ~ 0.09, indicating that the sedimentary organic matter is mainly derived from terrestrial higher plants. The composition and distribution characteristics of n-paraffins (Fig. 2) showed obvious zigzag pattern. C_ (29) and C_ (31) were the main compounds, indicating that the contribution of plant wax was dominant. However, the possibility of human activities or industrial pollution Sex less. Isoprenoids predominate phytochine, and the deposition of steroidal compounds (C 29S 20S 20S and C 29 αββ / (ααα + αββ ) (Fig.3) and terpenoids (C31S22S / (22S + 22R) and Hoene / Mohan) all reflect the maturity characteristics of organic matter with low maturity and indicate that the organic matter in the sediments may be associated with deep oil and gas leakage related.