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| 1 | The comparison of biomarkers released by hydropyrolysis and Soxhlet extraction from source rocks of different maturities显示文摘The Permian Dalong Formation(P2d) source rocks from the mature Guangyuan outcrop section and the overmature Wangcang outcrop section in Sichuan Basin were selected.The Soxhlet extraction and kerogen catalytic HyPy were conducted on the P2d source rocks.The biomarkers obtained by both methods were compared to discuss their difference and the influence extent of thermal maturation on covalently bound biomarkers.The results show that covalently bound biomarkers can hardly be correlated to the corresponding free biomarkers due to severe thermal alterations and/or interference of migrated hydrocarbons in both outcrop sections and thermal maturation have much lower influence on covalently bound biomarkers in kerogens than on free biomarkers in Soxhlet extracts.The application of HyPy in study of biomarker geochemistry can reduce the thermal maturation effect on biomarkers(Ro≤2.4%) to a greater extent and the interference of migrated hydrocarbons between interbedded layers.The covalently bound biomarkers released by HyPy are useful in the study of biomarker geochemistry and oil-source correlation on high-overmature source rocks. | WU LiangLiang LIAO YuHong FANG YunXin GENG AnSong | 2013 | Chinese Science Bulletin2013，58，3： | 4 |
| 2 | 松辽盆地湖相烃源岩中生物标志物的单体烃碳同位素组成特征及其意义显示文摘本研究对松科一井嫩江组一和二段(K2n^1和K2n^2)岩芯样品进行了有机碳稳定同位素和单体烃分子碳同位素分析,结合其他地球化学参数探讨了沉积环境与母质生物之间的关系。正构烷烃碳同位素在-35.7‰~-28.7‰之间变化,显示了各链长正构烷烃具有不同的母质生源。其中,中链正构烷烃(MCA)碳同位素明显贫^13C,偏轻达5‰,可能与其先体母质部分地利用了有机质降解的贫^13C的CO2有关。嫩江组藿烷碳同位素(δ^13Chopane)处于-32.00‰~-68.65‰之间,在嫩一段下部的δ^13Chopane)偏轻达到-68.65‰,表明该时期存在甲烷营养菌。在嫩一段δ^13CGa较重、δ^13Chopane显著偏轻的层段与水体分层、间歇性透光带缺氧相对应,反映了该时期的化跃层界面较浅,缺氧层上升到了透光带,这种极端的水体环境有利于沉积有机质的保存,造成了该层段高TOC、高HI的富有机质烃源岩的形成;而在嫩二段伽马蜡烷缺失、δ^13Chopane较重时,则反映了水体的化跃层界面较深,环境相对较为氧化,有机质保存条件变差,导致了该段TOC和HI相对较低。由此可见,水体化跃层界面的深浅不仅控制了湖泊沉积有机质的丰度,还影响了水体中微生物的发育,在化跃层较浅的层段,嗜甲烷菌、化学自养菌发育,而在化跃层较深的层段,水体中以化学自养菌为主。另外,δ^13CGa和δ^13C4-甲基甾烷与水体盐度呈正相关关系,水体盐度越高,其碳同位素值越重。 | 王丽 曹新星 李艳 尹琴 宋之光 | 2015 | 地球化学2015，44，4： | 3 |
| 3 | Geochemistry of Sediments from the Lopare Basin(Bosnia and Herzegovina):Implications for Paleoclimate,Paleosalinity,Paleoredox and Provenance显示文摘A combined inorganic and organic geochemical study was carried out on marls and mudstones collected from the Lower Miocene Lopare Basin,Bosnia and Herzegovina.A total of 46 samples collected from two boreholes,Pot 1(depth of 193 m)and Pot 3(depth of 344 m),showed that element abundances like boron(B),lithium(Li),strontium(Sr),uranium(U),chromium(Cr),nickel(Ni),magnesium(Mg),sodium(Na)and calcium(Ca)are much higher than average than in the upper continental crust(UCC).Chemical composition indicates at least two sources:(i)Mesozoic ophiolites occurring in the north of the investigated area,and(ii)dacito-andesitic pyroclastics(Mesozoic to Cenozoic).Lopare Basin sedimentation was influenced by strong evaporation resulting in a partly hypersaline lake,which formed during a warm climatic period,probably during the Miocene Climatic Optimum.A brief episode of humid climate conditions resulted in the basin fillingup and deposition of felsic sediments enriched in thorium(Th).Organic geochemistry shows that the majority of studied sediments contains predominantly immature to marginally mature algal organic matter(OM).The biomarker patterns are generally in agreement with the geological history of the Lopare Basin and inorganic and mineralogical data.Conversely,the molecular distribution of n-alkanes as reliable climatic andδ-MTTC as paleosalinity indicators do not support this conclusion. | AleksandraŠAJNOVIĆ Nenad GRBA Franz NEUBAUER Milica KAŠANIN-GRUBIN Ksenija STOJANOVIĆ Nenad PETKOVIĆ Branimir JOVANČIĆEVIĆ | 2020 | Acta Geologica Sinica(English Edition)2020，94，5： | 2 |
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