The relationship between methylated chromans and maturity of organic matter in the source rocks from Jianghan hypersaline basin

The distribution,the relative composition,and their variation of methylated chromans(MTTC) with maturation of organic matter in the source rocks from Mingjia 1 well,Jianghan hypersaline basin,have been analyzed and studied. There is a close relationship between the distribution of methylatd chromans...

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Veröffentlicht in:Science China. Earth sciences 2009-06, Vol.52 (S1), p.34-41
Hauptverfasser: Bao, JianPing, Zhu, CuiShan, Ma, AnLai
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description The distribution,the relative composition,and their variation of methylated chromans(MTTC) with maturation of organic matter in the source rocks from Mingjia 1 well,Jianghan hypersaline basin,have been analyzed and studied. There is a close relationship between the distribution of methylatd chromans and paleosalinity of depositional environment. In the Eq1-Eq3 source rocks deposited under hypersaline environment with lower Pr/Ph ratio,higher gammacerane index and abundant organic sulfur-containing compounds,methyl MTTC and dimethyl MTTC are main components,but in the Eq4 source rocks deposited non-hypersaline environment with relatively higher Pr/Ph ratio,lower gammacerane index and organic sulfur-containing compounds,trimethyl MTTC is a major compound in methylate chromans. Obviously,the distributions and the compositions of methylated chromans in the source rocks are in harmony with biomarker indicators indicating the paleaosalinity and redox of depositional environment. The relationship between the ratio of 5,8-dimethyl MTTC to 7,8-dimethyl MTTC(dimethyl MTTC ratio) and the maturity of organic matter in the source rocks from Mingjia 1 well has been discussed. The results show that dimethyl MTTC ratio increased with the burial depth and the maturation of organic matter in the source rocks,especially in immature level. It is noteworthy that this ratio is very susceptible to small variation in the maturity of organic matter in the source rocks when vitrinite reflectance Ro is less than 0.65%. It may imply that this ratio is a good and susceptible aromatic maturity indicator for the relative maturity of organic matter in immature source rocks.
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There is a close relationship between the distribution of methylatd chromans and paleosalinity of depositional environment. In the Eq1-Eq3 source rocks deposited under hypersaline environment with lower Pr/Ph ratio,higher gammacerane index and abundant organic sulfur-containing compounds,methyl MTTC and dimethyl MTTC are main components,but in the Eq4 source rocks deposited non-hypersaline environment with relatively higher Pr/Ph ratio,lower gammacerane index and organic sulfur-containing compounds,trimethyl MTTC is a major compound in methylate chromans. Obviously,the distributions and the compositions of methylated chromans in the source rocks are in harmony with biomarker indicators indicating the paleaosalinity and redox of depositional environment. The relationship between the ratio of 5,8-dimethyl MTTC to 7,8-dimethyl MTTC(dimethyl MTTC ratio) and the maturity of organic matter in the source rocks from Mingjia 1 well has been discussed. The results show that dimethyl MTTC ratio increased with the burial depth and the maturation of organic matter in the source rocks,especially in immature level. It is noteworthy that this ratio is very susceptible to small variation in the maturity of organic matter in the source rocks when vitrinite reflectance Ro is less than 0.65%. It may imply that this ratio is a good and susceptible aromatic maturity indicator for the relative maturity of organic matter in immature source rocks.</description><identifier>ISSN: 1674-7313</identifier><identifier>ISSN: 1006-9313</identifier><identifier>EISSN: 1869-1897</identifier><identifier>EISSN: 1862-2801</identifier><identifier>DOI: 10.1007/s11430-009-5018-4</identifier><language>eng</language><publisher>Heidelberg: SP Science in China Press</publisher><subject>basin ; Biomarkers ; chromans ; Crude oil ; depositional ; dimethyl ; Earth and Environmental Science ; Earth Sciences ; environment ; Geochemistry ; Geology ; hypersaline ; Jianghan ; matter ; Maturity ; methylated ; MTTC ; organic ; Organic matter ; ratio ; rock ; Rocks ; source ; Sulfur</subject><ispartof>Science China. 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Earth sciences</title><addtitle>Sci. China Ser. D-Earth Sci</addtitle><addtitle>SCIENCE CHINA Earth Sciences</addtitle><description>The distribution,the relative composition,and their variation of methylated chromans(MTTC) with maturation of organic matter in the source rocks from Mingjia 1 well,Jianghan hypersaline basin,have been analyzed and studied. There is a close relationship between the distribution of methylatd chromans and paleosalinity of depositional environment. In the Eq1-Eq3 source rocks deposited under hypersaline environment with lower Pr/Ph ratio,higher gammacerane index and abundant organic sulfur-containing compounds,methyl MTTC and dimethyl MTTC are main components,but in the Eq4 source rocks deposited non-hypersaline environment with relatively higher Pr/Ph ratio,lower gammacerane index and organic sulfur-containing compounds,trimethyl MTTC is a major compound in methylate chromans. 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D-Earth Sci</stitle><addtitle>SCIENCE CHINA Earth Sciences</addtitle><date>2009-06-01</date><risdate>2009</risdate><volume>52</volume><issue>S1</issue><spage>34</spage><epage>41</epage><pages>34-41</pages><issn>1674-7313</issn><issn>1006-9313</issn><eissn>1869-1897</eissn><eissn>1862-2801</eissn><abstract>The distribution,the relative composition,and their variation of methylated chromans(MTTC) with maturation of organic matter in the source rocks from Mingjia 1 well,Jianghan hypersaline basin,have been analyzed and studied. There is a close relationship between the distribution of methylatd chromans and paleosalinity of depositional environment. 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It is noteworthy that this ratio is very susceptible to small variation in the maturity of organic matter in the source rocks when vitrinite reflectance Ro is less than 0.65%. It may imply that this ratio is a good and susceptible aromatic maturity indicator for the relative maturity of organic matter in immature source rocks.</abstract><cop>Heidelberg</cop><pub>SP Science in China Press</pub><doi>10.1007/s11430-009-5018-4</doi><tpages>8</tpages></addata></record>
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identifier ISSN: 1674-7313
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source Alma/SFX Local Collection; SpringerLink Journals - AutoHoldings
subjects basin
Biomarkers
chromans
Crude oil
depositional
dimethyl
Earth and Environmental Science
Earth Sciences
environment
Geochemistry
Geology
hypersaline
Jianghan
matter
Maturity
methylated
MTTC
organic
Organic matter
ratio
rock
Rocks
source
Sulfur
title The relationship between methylated chromans and maturity of organic matter in the source rocks from Jianghan hypersaline basin
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