川西坳陷新场气田须家河组五段烃源岩分子地球化学特征
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摘要
上三叠统须家河组五段是川西坳陷新场气田勘探的热点层系之一.对新场须五段泥质烃源岩进行了分子地球化学分析,结果表明:新场须五段泥岩可溶抽提物姥植比介于0.26～1.70之间,C_(27)-C_(29)规则甾烷中C_(27)和C_(29)甾烷相对含量平均值分别为31.2%和44.6%,伽马蜡烷/C_(30)藿烷比值介于0.11～0.34,MPI_1、F_1和4-/1-MDBT均与成熟度呈正相关.新场须五段泥岩有机质生源中,陆源高等植物略占优势,但低等水生生物和藻类也具有一定的贡献;泥岩主要沉积于湖泊环境,部分沉积于缺氧的盐水环境.成熟度对一些芳烃化合物指标具有明显影响,成熟度超过1.25%的煤系烃源岩样品的三芴系列和成熟度超过1.2%的样品的MDBTs/MDBFs比值不能直接用于沉积环境的判别.
The 5th member of the Upper Triassic Xujiahe Formation(T_3x~5)is one of the important targets for terrigenous natural gas exploration in the Xinchang gas field in the West Sichuan Depression.The molecular geochemical characteristics have been analyzed in order to further determine the sedimentary environment of the T_3xsource rocks.The studies indicate that the Pr/Ph ratio of soluble extract from the T_3x~5 mudstone in the Xinchang gas field ranges from 0.26 to 1.70,and the relative contents of C_(27)and C_(29)in C_(27)-C_(29) regular steranes are 31.2%and 44.6%,respectively.The gammacerane/C_(30) hopane ratio ranges from 0.11to 0.34,and the MPI_1,F_1 and 4-/1-MDBT values of the T_3x~5 mudstone are all positively correlated with thermal maturity.The organic source of the T_3x~5 mudstone is dominated by terrigenous higher plant,and lower hydrobiont and algae have also made a certain contribution.The T_3x~5 mudstone was mainly deposited in the lacustrine environment,with part of the samples in the anoxic saline environment.Thermal maturity can significantly affect several indexes of aromatic compounds in coal-measure source rocks,and the three fluorene series of samples with R_o>1.25% and MDBTs/MDBFs ratios of samples with R_o>1.2%can not be directly used to determine the sedimentary environment.
The 5th member of the Upper Triassic Xujiahe Formation(T_3x~5)is one of the important targets for terrigenous natural gas exploration in the Xinchang gas field in the West Sichuan Depression.The molecular geochemical characteristics have been analyzed in order to further determine the sedimentary environment of the T_3xsource rocks.The studies indicate that the Pr/Ph ratio of soluble extract from the T_3x~5 mudstone in the Xinchang gas field ranges from 0.26 to 1.70,and the relative contents of C_(27)and C_(29)in C_(27)-C_(29) regular steranes are 31.2%and 44.6%,respectively.The gammacerane/C_(30) hopane ratio ranges from 0.11to 0.34,and the MPI_1,F_1 and 4-/1-MDBT values of the T_3x~5 mudstone are all positively correlated with thermal maturity.The organic source of the T_3x~5 mudstone is dominated by terrigenous higher plant,and lower hydrobiont and algae have also made a certain contribution.The T_3x~5 mudstone was mainly deposited in the lacustrine environment,with part of the samples in the anoxic saline environment.Thermal maturity can significantly affect several indexes of aromatic compounds in coal-measure source rocks,and the three fluorene series of samples with R_o>1.25% and MDBTs/MDBFs ratios of samples with R_o>1.2%can not be directly used to determine the sedimentary environment.
引文
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Cheng,K.M.,Wang,T.G.,Zhong,N.N.,1995.Geochemistry of Source Rocks.Science Press,Beijing(in Chinese).
Dai,J.X.,2016.Giant Coal-Derived Gas Fields and Their Gas Sources in China.Science Press,Beijing.
Dai,J.X.,Ni,Y.Y.,Zou,C.N.,et al.,2009.Stable Carbon Isotopes of Alkane Gases from the Xujiahe Coal Measures and Implication for Gas-Source Correlation in the Sichuan Basin,SW China.Organic Geochemistry,40(5):638-646.https://doi.org/10.1016/j.orggeochem.2009.01.012
Goodwin,N.S.,Mann,A.L.,Patience,R.L.,1988.Structure and Significance of C304-Methyl Steranes in Lacustrine Shales and Oils.Organic Geochemistry,12(5):495-506.https://doi.org/10.1016/0146-6380(88)90159-3
Huang,S.W.,Zhang,T.S.,Wang,S.Y.,et al.,2004.Research on Source Characteristics and Origin of Xujiahe Formation,Upper Triassic in Chishui Area,Sichuan Basin.Natural Gas Geoscience,15(6):590-592(in Chinese with English abstract).
Huang,W.Y.,Meinschein,W.G.,1979.Sterols as Ecological Indicators.Geochimica et Cosmochimica Acta,43(5):739-745.https://doi.org/10.1016/0016-7037(79)90257-6
Hughes,W.B.,Holba,A.G.,Dzou,L.I.P.,1995.The Ratios of Dibenzothiophene to Phenanthrene and Pristane to Phytane as Indicators of Depositional Environment and Lithology of Petroleum Source Rocks.Geochimica et Cosmochimica Acta,59(17):3581-3598.https://doi.org/10.1016/0016-7037(95)00225-o
Jiang,X.G.,Zeng,H.S.,Zhu,J.H.,et al.,2012.Dynamic Evolution Simulation of the Upper Triassic Source Rocks in Central Part of Western Sichuan Depression.Oil&Gas Geology,33(4):545-551(in Chinese with English abstract).
Kvalheim,O.M.,Christy,A.A.,Telns,N.,et al.,1987.Maturity Determination of Organic Matter in Coals Using the Methylphenanthrene Distribution.Geochimica et Cosmochimica Acta,51(7):1883-1888.https://doi.org/10.1016/0016-7037(87)90179-7
Li,H.,Lu,J.L.,Li,R.L.,et al.,2017.Generation Paleoenvironment and Its Controlling Factors of Lower Cretaceous Lacustrine Hydrocarbon Source Rocks in Changling Depression,South Songliao Basin.Earth Science,42(10):1774-1786(in Chinese with English abstract).https://doi.org/10.3799/dqkx.2017.539
Li,Q.F.,Miao,S.D.,Li,Y.X.,et al.,2018.Reservoir Characteristics and Genesis of the Changxing Formation on the Margin of Yanting-Tongnan Trough,Central Sichuan Basin.Earth Science,43(10):3553-3567(in Chinese with English abstract).https://doi.org/10.3799/dqkx.2018.313
Li,W.,2011.Formation of a Saline Environment and Evolution of a Sedimentary System in the Late Triassic Reservoirs of the Sichuan Basin.Natural Gas Industry,31(9):31-38(in Chinese with English abstract).
Li,Y.,Zhu,Y.M.,Hao,F.,et al.,2015.Thermal Evolution and Applications of Aromatic Hydrocarbons in Highly Mature Coal-Bearing Source Rocks of the Upper Triassic Xujiahe Formation in the Northern Sichuan Basin.Science China Earth Sciences,58(11):1960-1969.https://doi.org/10.1007/s11430-015-5084-8
Lin,R.Z.,Wang,P.R.,1991.PAH in Fossil Fuels and Their Geochemical Significance.Journal of Southeast Asian Earth Sciences,5(1-4):257-262.https://doi.org/10.1016/0743-9547(91)90034-u
Peters,K.E.,Moldowan,J.M.,1993.The Biomarker Guide:Interpreting Molecular Fossil in Petroleum and Ancient Sediments.Prentice Hall,New Jersey.
Radke,M.,Vriend,S.P.,Ramanampisoa,L.R.,2000.Alkyldibenzofurans in Terrestrial Rocks:Influence of Organic Facies and Maturation.Geochimica et Cosmochimica Acta,64(2):275-286.https://doi.org/10.1016/s0016-7037(99)00287-2
Radke,M.,Welte,D.H.,Willsch,H.,1982.Geochemical Study on a Well in the Western Canada Basin:Relation of the Aromatic Distribution Pattern to Maturity of Organic Matter.Geochimica et Cosmochimica Acta,46(1):1-10.https://doi.org/10.1016/0016-7037(82)90285-x
Radke,M.,Welte,D.H.,Willsch,H.,1986.Maturity Parameters Based on Aromatic Hydrocarbons:Influence of the Organic Matter Type.Organic Geochemistry,10(1-3):51-63.https://doi.org/10.1016/0146-6380(86)90008-2
Shen,Z.M.,Liu,T.,Lü,Z.X.,et al.,2008.A Comparison Study on the Gas Source of Jurassic Natural Gas in the Western Sichuan Depression.Geological Journal of China Universities,14(4):577-582(in Chinese with English abstract).
Shen,Z.M.,Wei,J.H.,Zhu,H.Q.,et al.,2009.Comparative Research on Maturity Feature and Maturity Indicator of Coal Source Rock from West Sichuan Basin Depression.Journal of Mineralogy and Petrology,29(4):83-88(in Chinese with English abstract).
Sinninghe Damsté,J.S.,Kenig,F.,Koopmans,M.P.,et al.,1995.Evidence for Gammacerane as an Indicator of Water Column Stratification.Geochimica et Cosmochimica Acta,59(9):1895-1900.https://doi.org/10.1016/0016-7037(95)00073-9
Song,C.Y.,Jin,H.R.,Liu,X.,et al.,2007.Distribution of Methyl Phenanthrene in Sediments and Its Impacting on Maturity Parameters.Petroleum Geology&Experiment,29(2):183-187(in Chinese with English abstract).
Song,Z.X.,Zhou,Z.M.,2013.Identification of Chief Hydrocarbon Source Rocks in Lishu Fault Depression and Their Geochemical Characteristics.Petroleum Geology&Experiment,35(4):438-444(in Chinese with English abstract).
Summons,R.E.,Volkman,J.K.,Boreham,C.J.,1987.Dinosterane and Other Steroidal Hydrocarbons of Dinoflagellate Origin in Sediments and Petroleum.Geochimica et Cosmochimica Acta,51(11):3075-3082.https://doi.org/10.1016/0016-7037(87)90381-4
Sun,L.N.,Zhang,Z.N.,Wu,Y.D.,et al.,2015.Evolution Patterns and Their Significances of Biomarker Maturity Parameters-A Case Study on Liquid Hydrocarbons from TypeⅢSource Rock under HTHP Hydrous Pyrolysis.Oil&Gas Geology,36(4):573-580(in Chinese with English abstract).
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