基于分子标志物的有机质成熟度评价参数选择及其适用范围分析
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摘要
分子标志物作为反映有机质热演化信息的重要载体,具有随温度升高发生侧链断裂、异构化和芳构化的性质,部分对温度增高具有良好响应的分子标志物参数具备表征成熟度的基本条件。根据分子标志物在热演化中的结构变化规律及其有效性和适用性,甄选出可用于有机质成熟度评价的多种分子标志物参数:姥鲛烷异构化指数(PIR)、锥满烷指数(DHR)(8β(H)-锥满烷/8β(H)-高锥满烷)、藿烷(Ts/(Tm+Ts))、重排甾烷(20S/(20S+20R))、金刚烷、烷基萘、甲基菲以及烷基二苯并噻吩(DBTs)。鉴于不同参数优点与适用范围的差异性,多参数联合使用可提高评价的准确性。研究结果表明:C29甾烷参数与单芳甾烷联合使用适用于Ro≤0.7%的有机质成熟度评价,Ts/(Tm+Ts)、单芳甾烷、甲基菲比值(MPR)、甲基菲指数(MPI)、DHR与甲基二苯并噻吩分布指数(MDBI)的联合使用可评价0.7%≤Ro≤1.3%范围内的有机质成熟度,MPI、DHR、烷基萘指数、甲基双金刚烷成熟度指标(IMD),即4-MD/(1-MD+3-MD+4-MD)和PIR的联合使用可评价1.3%≤Ro≤2.0%范围内的有机质成熟度,当Ro≥2.0%时,则仅有PIR具有有效性。
The molecular marker with the properties of lateral chain break,isomerization and aromatization with temperature increasing is an important carrier to reflect the thermal evolution of organic matter.Some molecular markers can be used to evaluate the maturity with good response to temperature increase.According to the rules of structure change and the effectiveness and applicability of molecular markers in thermal evolution,parameters of various molecular markers can be used to evaluate the maturity.The markers selected are:pristane isomerization index(PIR),drimane(DHR),hopane(Ts/(Tm+Ts)),diasterane(20S/(20S+20 R)),adamantane,alkylnaphthalene,methylphenanthrene and alkyl dibenzothiophene(DBTs).In view of different advantages and the application range between different parameters,accuracy of evaluation can improve by the combined use of multiple parameters.Research results show that the combined use of C29 sterane and alkyl aryl parameters is suitable to evaluate the organic matter maturity with the feature of Ro≤0.7%;Ts/(Tm+Ts),alkyl aryl,MPR,MPI,DHR and MDBI can be combine to evaluate the maturity with the Rorange of 0.7%-1.3%;MPI,DHR,Aikyinaphthalene index,IMD and PIR can be combine to evaluate the maturity with the Rorange of 1.3%-2%;only PIR are effective when
The molecular marker with the properties of lateral chain break,isomerization and aromatization with temperature increasing is an important carrier to reflect the thermal evolution of organic matter.Some molecular markers can be used to evaluate the maturity with good response to temperature increase.According to the rules of structure change and the effectiveness and applicability of molecular markers in thermal evolution,parameters of various molecular markers can be used to evaluate the maturity.The markers selected are:pristane isomerization index(PIR),drimane(DHR),hopane(Ts/(Tm+Ts)),diasterane(20S/(20S+20 R)),adamantane,alkylnaphthalene,methylphenanthrene and alkyl dibenzothiophene(DBTs).In view of different advantages and the application range between different parameters,accuracy of evaluation can improve by the combined use of multiple parameters.Research results show that the combined use of C29 sterane and alkyl aryl parameters is suitable to evaluate the organic matter maturity with the feature of Ro≤0.7%;Ts/(Tm+Ts),alkyl aryl,MPR,MPI,DHR and MDBI can be combine to evaluate the maturity with the Rorange of 0.7%-1.3%;MPI,DHR,Aikyinaphthalene index,IMD and PIR can be combine to evaluate the maturity with the Rorange of 1.3%-2%;only PIR are effective when
引文
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[2]陈建渝.生物标志物地球化学的新进展[J].地质科技情报,1995,14(1):35-44.
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[4]杨平,汪正江,谢渊,等.黔北下寒武统牛蹄塘组烃源岩的生物标志物特征和沉积环境[J].地质通报,2012,31(11):1910-1921.
[5]崔景伟,王铁冠,胡健,等.塔里木盆地和田河气田轻质油成熟度判定及其油源意义[J].石油天然气地质,2013,34(1):27-36.
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[7]马安来,张水昌,张大江,等.生物降解原油地球化学研究新进展[J].地球科学进展,2005,20(4):449-454.
[8]王作栋,孟仟祥,陶明信,等.烃源岩中C19~C29甾烷系列和25-降藿烷系列的检出及其地质意义[J].沉积学报,2009,27(1):180-185.
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[10]郝石生,王飞宇,高岗,等.下古生界高过成熟烃源岩特征和评价[J].勘探家,1996,1(2):25-32.
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[13]丰国秀,陈盛吉.岩石中沥青反射率与镜质体反射率之间的关系[J].天然气工业,1988,8(3):20-25.
[14]黄海平,卢松年,袁佩兰.古代沉积物中新检出的重排藿烷及其在油气勘探上的意义[J].天然气地球科学,1994,23(5):23-28.
[15]Peters K,Woldowan J.The biomarker guide:Interpreting molecular fossils petroleum and ancient sediments[M].New Jersey:Engle-wood Cliffs,1993:46-59.
[16]Huang Dian,Li Jinchao,Zhang Dajiang.Maturation sequence of continental crude oils in hydrocarbon basins in China and its significance[J].Organic Geochemistry,1990,16(1/3):521-529.
[17]曾凡刚,程克明.华北地区下古生界海相烃源岩芳烃生物标志物地球化学特征:兼论饱和烃、芳烃生源组合特征[J].地质地球化学,1998,26(3):33-39.
[18]任军虎,王万春,康晏.有机地球化学指标的分析[J].矿物岩石地球化学通报,2006,25(3):266-271.
[19]包建平,王铁冠,周玉琦,等.甲基菲比值与有机质热演化的关系[J].江汉石油学院学报,1992,14(4):8-13.
[20]徐冠军,帅燕华,王培荣,等.姥鲛烷、植烷立体异构体的色谱分离及地球化学意义[J].地球化学,2010,39(5):491-496.
[21]吴应琴,王永莉,雷天柱,等.下古生界高过成熟烃源岩成熟度指标:姥鲛烷异构化指数研究[J].质谱学报,2014,35(4):317-323.
[22]Luo Binjie,Wang Youxiao,Meng Qianxiang,et al.Geochemistry of biogclic alkanes in sediments,coal and crade oil[J].Science in China:B,1991,34(3):363-376.
[23]孟仟祥,房嬛,徐永昌,等.柴达木盆地石炭系烃源岩和煤岩生物标志物特征及其地球化学意义[J].沉积学报,2004,22(4):729-736.
[24]Peters K E,Walters C C,Moldowan J M.The biomarker guide[M].2nd.Cambridge:Cambridge University Press,2005.
[25]王春江,傅家谟,盛国英,等.18α(H)-新藿烷及17α(H)-重排藿烷类化合物的地球化学属性与应用[J].科学通报,2000,45(13):1366-1372.
[26]陈中红,查明,金强,等.东营凹陷古近系升藿烷生物标志物参数分布及演变规律[J].沉积学报,2011,29(1):173-183.
[27]陈中红,查明,金强.典型断陷湖盆C27三降藿烷参数演化及其控制因素:以东营凹陷古近系为例[J].沉积学报,2010,28(3):635-642.
[28]张润合,杨斌.噻吩类化合物:判识海相原油类型和评价高演化碳酸盐岩烃源岩成熟度的理想生物标志物[J].海相油气地质,1998,3(2):6-10.
[29]陈世加,王廷栋,黄清德,等.C29凿烷成熟度指标“倒转”及其地质意义[J].天然气地球科学,1997,8(1):28-30.
[30]陈军红,傅家谟,盛国英,等.金刚烷化合物的结构特性及其地球化学意义[J].科学通报,1996,41(6):524-527.
[31]郭小文,何生,陈红汉.甲基双金刚烷成熟度指标讨论与应用[J].地质科技情报,2007,26(1):71-76.
[32]曾凡刚,程克明.利用双金刚烷指标研究下古生界海相碳酸盐岩的热成熟度[J].地质地球化学,1998,26(3):16-20.
[33]傅宁,李友川.估算天然气成熟度的新指标:金刚烷指标[J].沉积学报,2001,19(1):145-149.
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