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Geochemical significance of tricyclic and tetracyclic terpanes in source rock extracts from the Offshore Niger Delta Basin,Nigeria 被引量:2
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作者 Abiodun B.Ogbesejana Oluwasesan M.Bello +3 位作者 Tijjani Ali Uduma A.Uduma Kamaluddeen S.Kabo Oluwadurotimi O.Akintade 《Acta Geochimica》 EI CAS CSCD 2021年第2期184-198,共15页
Tricyclic and tetracyclic terpanes are important constituents of crude oil and source rock extracts.However,they have not been reported in the Offshore Niger Delta Basin,Nigeria.Thus,the present study investigated the... Tricyclic and tetracyclic terpanes are important constituents of crude oil and source rock extracts.However,they have not been reported in the Offshore Niger Delta Basin,Nigeria.Thus,the present study investigated the geochemical significance of tricyclic and tetracyclic terpanes in source rock extracts from the Offshore Niger Delta Bain,Nigeria with gas chromatography-mass spectrometry(GC-MS).The total relative abundances of tricyclic terpanes,C_(19)TT-C_(21)TT,and C_(23) TT in the rock samples ranged from 82.50 to 96.37%,50.08 to 74.17%,and 25.83 to 49.92%,respectively.These values showed the source rocks were formed from a mixed origin(terrestrial and marine).Among the tricyclic and tetracyclic terpanes identified in the rock extracts,the conventional(C_(20)TT,C_(23)TT,C_(24)TT,C_(24)TeT)and recent(Y1,X1,Z1)were more prominent than all others,indicating mixed input of terrigenous and marine organic matter.The C_(24)TT/C_(23)TT,C_(24)TeT/(C_(24)TeT+C_(26)TT),C_(19)TT/C_(23)TT,C_(20)TT/C_(23)TT,C_(25)TT/C_(24)TeT,C_(25)TT/C_(26)TT,C_(19)TT/C_(20)TT,C_(24)TeT/C_(26)TT,Z1/(Z1+C_(24)TT),and Y1/(Y1+C_(24)TT)in the rock samples range from 0.33 to 1.30,0.76 to 0.90,0.18 to 0.73,0.34 to 1.05,0.33 to 1.74,0.30 to 1.39,0.31 to0.89,1.66 to 4.33,0.36 to 0.83,and 0.34 to 0.79,respectively.These values further showed that the rock samples were formed from mixed input of terrigenous and marine organic matter and deposited under oxic to suboxic conditions in lacustrine-fluvial/deltaic environments.Also,the C_(24)TeT/C_(20)-26TT,C_(24)TeT/C_(30)HOP,and C_(23)TT/C_(30)HOP ranged from 0.16 to 0.45,0.02 to 0.42,and 0.01 to 0.48,respectively.This range of values suggests that source rocks were within immature to early mature stage.Thus,this study showed that tricyclic and tetracyclic terpanes were effective in determining the origin,depositional environments,and thermal maturity of source rocks in the Niger Delta Basin,Nigeria. 展开更多
关键词 Tricyclic terpanes Tetracyclic terpanes Source rocks Niger delta Gas chromatography-mass spectrometry(GC-MS)
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Identification and geochemical significance of unusual C24 tetracyclic terpanes in Shahejie Formation source rocks in the Bozhong subbasin,Bohai Bay Basin 被引量:2
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作者 Ning Wang Yao-Hui Xu +3 位作者 Fei-Long Wang Yan Liu Qian Huang Xing Huang 《Petroleum Science》 SCIE CAS CSCD 2022年第5期1993-2003,共11页
C_(24)tetracyclic terpanes are common compounds in source rocks and crude oils,and C_(24)17,21-secohopane is the most common and widely used source-related indicator.In this study,three unusual C_(24)tetracyclic terpa... C_(24)tetracyclic terpanes are common compounds in source rocks and crude oils,and C_(24)17,21-secohopane is the most common and widely used source-related indicator.In this study,three unusual C_(24)tetracyclic terpanes were detected on the m/z 191 chromatogram of saturated hydrocarbons in the Shahejie Formation source rocks in the Bozhong subbasin.Based on the mass spectra characteristics,diagnostic ion fragments,retention time and comparisons with published literature,three unusual C_(24)tetracyclic terpanes were identified as 10β(H)-des-A-oleanane,10β(H)-des-A-lupane and C_(24)des-Ahopane.To the best of our knowledge,this is the first study to detect and publicly report these three compounds in source rock samples from the Shahejie Formation of the Bozhong subbasin,Bohai Bay Basin.The results indicated that 10β(H)-des-A-oleanane and 10β(H)-des-A-lupane likely originated from terre strial angiosperms,while C_(24)des-A-hopane likely originated fro m prokaryotic o rganisms.Te rrestrial angiosperms provide the material basis for the generation of compounds A and B,and the distribution and concentration of these two compounds are affected by thermal maturity.In the low maturity stage(0.5%<R_(0)<0.7%),compounds A and B are relatively enriched in the source rocks. 展开更多
关键词 Unusual tetracyclic terpanes 10β(H)-des-A-oleanane 10β(H)-des-A-lupane Geochemical significance Shahejie Formation Bozhong subbasin
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Tricyclic aromatic diterpanes found in the Tertiary sediments and their geochemical significance
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作者 SHENG Guoying FU Jiamo +1 位作者 SONG Yitao PENG Ping’an 《Chinese Science Bulletin》 SCIE EI CAS 2000年第S1期11-15,共5页
One monoaromatic tricyclic diterpane and two aromatic tricyclic diterpanes were found in three low-maturity source rocks and five crude oils of the Tertiary Shahejie Formation in Shengli Oil Field. The compounds found... One monoaromatic tricyclic diterpane and two aromatic tricyclic diterpanes were found in three low-maturity source rocks and five crude oils of the Tertiary Shahejie Formation in Shengli Oil Field. The compounds found include C19H28 (m/z 145, M+ 256) ring-C monoaromatic tricyclic terpane, C17H20 (m/z 209, M+ 224) and C18H22 (m/z 223,M+ 238) rings-B,C diaromatic diterpanes. The results show that these compounds are biomarkers of immature organic matter with a stability sequence of C18H22 】 C17H20 】 C19H28. The cleavage of ring-D of pentacyclic triterpanoids, such as oleanene, hopene, fernene, ursene, in the early stage of diagenesis may be one of the origin pathways of rings-B, C diaromatic tricyclic diterpanes. 展开更多
关键词 monoaromatic TRICYCLIC terpane diaromatic TRICYCLIC diterpanes TERTIARY Shahejie Formation IMMATURE source rocks CRUDE oil.
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A NOVEL TRICYCLIC TERPANE BIOMARKER SERIES IN THE UPPER PROTEROZOIC BITUMINOUS SANDSTONE, EASTERN YANSHAN REGION 被引量:3
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作者 王铁冠 《Science China Chemistry》 SCIE EI CAS 1991年第4期479-489,共11页
Based on coinjection and/or comparison with synthesized standards, a novel C_(18-23) tricy-clic terpane series with a base peak at m/z 123 on their mass spectra have been detected andconclusively identified from the b... Based on coinjection and/or comparison with synthesized standards, a novel C_(18-23) tricy-clic terpane series with a base peak at m/z 123 on their mass spectra have been detected andconclusively identified from the basal sandstone in the Upper Proterozoic Xiamaling For-mation, eastern Yanshan region, North China, and their molecular structure has been deter-mined as 13α(n- alkyl)- tricyclic terpanes. Dealing with the biomarker assemblage of the reser-voir bitumen, the source input of their organic material, two kinds of degradation effectsand origin of the novel tricyclic terpane series are approached herein. 展开更多
关键词 PROTEROZOIC fossil oil pool 13α(n-alkyl)-tricyclic terpane SERIES dehydroditerpenoids source input
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Novel Tetracyclic Terpanes in Crude Oils and Source Rock Extracts in Pearl River Mouth Basin and Their Geological Significance 被引量:3
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作者 Ning Ma Dujie Hou Hesheng Shi 《Journal of Earth Science》 SCIE CAS CSCD 2014年第4期713-718,共6页
Novel tetracyclic terpanes X and Y namely C24-des-A-oleanane and C27 tetracyclic terpane were detected in crude oils and source rock extracts in Zhu 1 depression in Pearl River Mouth Basin by GC-MS analysis technology... Novel tetracyclic terpanes X and Y namely C24-des-A-oleanane and C27 tetracyclic terpane were detected in crude oils and source rock extracts in Zhu 1 depression in Pearl River Mouth Basin by GC-MS analysis technology. These compounds are similar to oleanane in the structure, and their relative abundance in m/z 191 partial mass cbromatogram has a good correlation with oleanane. Here compounds X and Y are considered to be derived from the des-A degradation of oleanoid precursor. The ratio of X/(X-I-C24) and Y/(Y-I-C24) increase with the increasing inputs of terrigenous organic matter in crude oils. Wenchang Formation middle-deep lacustrine source rocks with planktonic algae organic matter inputs and oil generating from it contain low abundance of compounds X and Y, while Enping Formation coal measures source rocks with terrigenous higher plants organic matter inputs and oil generating from it usually have higher compounds X and Y. In general when two terrigenous compounds C19 tricyclic terpane and bicadinane-T are high in crude oils, there are also a corresponding high abundant compounds X and Y. Relative abundance of compounds X and Y is closely related to the source of organic matter and it can indicate the input of terrigenous organic matter. 展开更多
关键词 tetracyclic terpane terrigenous input oil genetic type Pearl River Mouth Basin.
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Identification and Genetic Significance of Methyltri- and Methyltetracyclic Terpanes
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作者 王铁冠 盛国英 +1 位作者 陈军红 傅家谟 《Chinese Science Bulletin》 SCIE EI CAS 1994年第19期1634-1637,共4页
Among the extended cyclic terpenoid biomarkers reported in literature thus far,the C-3 and/or C-2 methyl-substituted counterparts have been found either in bicyclic drimane series,or in pentacyclic hopane series. Even... Among the extended cyclic terpenoid biomarkers reported in literature thus far,the C-3 and/or C-2 methyl-substituted counterparts have been found either in bicyclic drimane series,or in pentacyclic hopane series. Even though the extended tri- and tetracyclic terpane series have been known over two decades,and 展开更多
关键词 methyltricyclic terpanes methyltetracyclic terpanes biomarkers MICROBIAL SOURCE input.
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严重生物降解原油GC-MS特征及油源对比 被引量:4
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作者 宋孚庆 任冬苓 +1 位作者 张文龙 王汇彤 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期304-305,308,共3页
  图牧吉油砂位于松辽盆地边缘,搞清它的油源对于该地区的油气勘探有着十分重要的意义.气相色谱-质谱分析表明,该样品受到了严重的生物降解,部分用于对比的甾、萜烷生标标志物受到了降解,使与之有关的参数值发生了变化,给油源对比带...   图牧吉油砂位于松辽盆地边缘,搞清它的油源对于该地区的油气勘探有着十分重要的意义.气相色谱-质谱分析表明,该样品受到了严重的生物降解,部分用于对比的甾、萜烷生标标志物受到了降解,使与之有关的参数值发生了变化,给油源对比带来了困难.…… 展开更多
关键词 Oil sand GC - MS Severely biodegraded oil Tricyclic terpane
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石油样品GC-MS分析中存在的问题及解决方法 被引量:1
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作者 韩霞 吴拓 +3 位作者 郭军 马玉东 李培新 王贺 《分析测试学报》 CAS CSCD 北大核心 2007年第z1期311-313,共3页
Some problems often occur in the analysis for petroleum samples by GC-MS.When high content wax composes oil samples,the n-alkanes in saturated fraction would disturb the mass chromatograph distribution and result of b... Some problems often occur in the analysis for petroleum samples by GC-MS.When high content wax composes oil samples,the n-alkanes in saturated fraction would disturb the mass chromatograph distribution and result of biomarkers.The n-alkanes can be removed from the saturated fraction by complexation,which n-alkanes react with carbamide supersaturated in methanol solution.Nevertheless,levels of the complexation can also affect on the mass chromatograph distribution and result of biomarkers.This paper discusses these problems and measures. 展开更多
关键词 GC-MS Crude oil High-wax oil biomarker N-ALKANE terpane STERANE
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Biomarker assemblage of boghead in Shuicheng, western Guizhou
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作者 王铁冠 盛国英 +1 位作者 陈军红 傅家谟 《Science China Earth Sciences》 SCIE EI CAS 1996年第1期74-81,共8页
The aliphatic fraction of Shuicheng boghead is characterized by the mixed source inputs of microbes and higher plants. The products of microbial source inputs, i. e. C21- n-alkanes. tricyclic terpanes, steranes, singl... The aliphatic fraction of Shuicheng boghead is characterized by the mixed source inputs of microbes and higher plants. The products of microbial source inputs, i. e. C21- n-alkanes. tricyclic terpanes, steranes, single-methyl branched alkanes, isoprenoid alkanes except phytane series, drimane series, tetracyclic terpanes and hopane type of triterpanes, amount to 52.4% of the aliphatic fraction, while hydrocarbons of higher plant source input, including C22+ alkanes and some sesquiterpenoids, account for 32.2%. In addition, the phytane series of photoautotrophic chlorophyll source input just make up 7.0% of the fraction. 展开更多
关键词 boghead BIOMARKER ASSEMBLAGE methyltricyclic terpanes methy 1-tetracyclic terpanes.
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