一组有效区分渤中凹陷烃源岩的生物标志化合物参数
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摘要
渤中凹陷是渤海湾盆地面积最大的二级构造单元,发育古近系沙河街组一段、沙河街组三段和东营组三段3套优质湖相烃源岩。准确识别东营组三段烃源岩贡献的原油,对于渤中凹陷油气勘探具有重要的理论和实践意义。根据烃源岩和原油芳烃馏分的色谱-质谱分析结果,提出了新的能够鉴别沙河街组三段和东营组三段烃源岩的生物标志化合物参数:C2720R/C2820R三芳甾烷和C2820S/C2720R三芳甾烷。东营组三段烃源岩的判识标准为C2720R/C2820R三芳甾烷>1.1,C2820S/C2720R三芳甾烷≤1.2;沙河街组三段烃源岩的判识标准为C2720R/C2820R三芳甾烷≤1.1,C2820S/C2720R三芳甾烷>1.2。据此,对渤中凹陷典型油田中原油的来源开展了判识,提出来自东营组三段烃源岩的原油具有近凹成藏的特点。
In Bozhong sag as the largest sub-tectonic unit in Bohai Bay Basin,three sets of high-quality lacustrine source rocks are developed,i.e.,Member 1 and 3 of Paleogene Shahejie Formation(E3 s1 and E2 s3)and Member 3 of Dongying Formation(E3 d3).Accurate identification of the crude oil from E3 d3 source rocks is of great theoretical and practical significance for petroleum exploration in Bozhong sag.According to the aromatic GC-MS analysis of crude oil and source rocks,this study proposes new biomarker parameters for distinguishing E3 d3 and E2 s3 source rocks,i.e.,C2720 R/C2820 R tri-aromatic steroid(TAS)and C2820 S/C2720 R TAS.Source rocks with C2720 R/C2820 R TAS>1.1 and C2820 S/C2720 R TAS≤1.2 are classified as E3 d3,and those with C2720 R/C2820 R TAS≤1.1 and C2820 S/C2720 R TAS>1.2 are considered to be E2 s3.Accordingly,this study also analyzes the sources of crude oil in typical oil fields of Bozhong sag,and puts forwards that the crude oil from E3 d3 source rocks presents the characteristics of accumulated in or near the sag.
In Bozhong sag as the largest sub-tectonic unit in Bohai Bay Basin,three sets of high-quality lacustrine source rocks are developed,i.e.,Member 1 and 3 of Paleogene Shahejie Formation(E3 s1 and E2 s3)and Member 3 of Dongying Formation(E3 d3).Accurate identification of the crude oil from E3 d3 source rocks is of great theoretical and practical significance for petroleum exploration in Bozhong sag.According to the aromatic GC-MS analysis of crude oil and source rocks,this study proposes new biomarker parameters for distinguishing E3 d3 and E2 s3 source rocks,i.e.,C2720 R/C2820 R tri-aromatic steroid(TAS)and C2820 S/C2720 R TAS.Source rocks with C2720 R/C2820 R TAS>1.1 and C2820 S/C2720 R TAS≤1.2 are classified as E3 d3,and those with C2720 R/C2820 R TAS≤1.1 and C2820 S/C2720 R TAS>1.2 are considered to be E2 s3.Accordingly,this study also analyzes the sources of crude oil in typical oil fields of Bozhong sag,and puts forwards that the crude oil from E3 d3 source rocks presents the characteristics of accumulated in or near the sag.
引文
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[16]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.ZENG Fangang,CHENG Keming.Characteristics of aromatic hydrocarbon biomarkers from lower Palaeozoic marine carbonate rocks in north China[J].Geology-Geochemistry,1998,26(3):33-39.
[17]倪春华,包建平,顾忆.生物降解作用对芳烃生物标志物参数的影响研究[J].石油实验地质,2008,30(4):386-389.NI Chunhua,BAO Jianping,GU Yi.Study of biodegradation effect on aromatic biomarker parameters[J].Petroleum Geology and Experiment,2008,30(4):386-389.
[18]陈建平,邓春萍,宋孚庆,等.用生物标志物定量计算混合原油油源的数学模型[J].地球化学,2007,36(2):205-214.CHEN Jianping,DENG Chunping,SONG Fuqing,et al.Mathematical calculating model using biomarkers to quantitatively determine relative source proportion of mixed oils[J].Geochimica,2007,36(2):205-214.
[19]宋孚庆,张大江,王培荣,等.生物降解混源油混合比例估算方法[J].石油勘探与开发,2004,31(2):67-70.SONG Fuqing,ZHANG Dajiang,WANG Peirong,et al.A contribution evaluation method for biodegraded mixed oils[J].Petroleum Exploration and Development,2004,31(2):67-70.
[2]邓运华,薛永安,于水,等.浅层油气运聚理论与渤海大油田群的发现[J].石油学报,2017,38(1):1-8.DENG Yunhua,XUE Yong’an,YU Shui,et al.Shallow hydrocarbon migration and accumulation theory and discovery of giant oilfield group in Bohai Sea[J].Acta Petrolei Sinica,2017,38(1):1-8.
[3]夏庆龙,徐长贵.渤海海域复杂断裂带地质认识创新与油气重大发现[J].石油学报,2016,37(增刊1):22-33.XIA Qinglong,XU Changgui.New geological understandings and major hydrocarbon discoveries in the complex fault zone of Bohai Sea[J].Acta Petrolei Sinica,2016,37(S1):22-23.
[4]夏庆龙,周心怀,薛永安,等.渤海海域油气藏形成分布与资源潜力[M].北京:石油工业出版社,2012.XIA Qinglong,ZHOU Xinhuai,XUE Yong’an,et al.The formation and distribution of oil and gas fields and the resource potential in Bohai Sea[M].Beijing:Petroleum Industry Press,2012.
[5]薛永安.渤海海域油气运移“汇聚脊”模式及其对新近系油气成藏的控制[J].石油学报,2018(9):963-970.XUE Yong’an.The “catchment ridge”model of hydrocarbon migration in Bohai Sea and its control on Neogene hydrocarbon accumulation[J].Acta Petrolei Sinica,2018,39(9):963-970.
[6]王培荣,张大江,宋孚庆,等.区分渤中坳陷三套烃源岩的地球化学参数组合[J].中国海上油气,2004,16(3):157-160.WANG Peirong,ZHANG Dajiang,SONG Fuqing,et al.The comprehensive geochemical parameters for distinguishing three sets of source rock in Bozhong depression[J].China Offshore Oil,2004,16(3):157-160.
[7]张斌,何媛媛,陈琰,等.柴达木盆地西部咸化湖相优质烃源岩地球化学特征及成藏意义[J].石油学报,2017,38(10):1158-1167.ZHANG Bin,HE Yuanyuan,CHEN Yan,et al.Geochemical characteristics and oil accumulation significance of the high quality saline lacustrine source rocks in the western Qaidam Basin,NW China[J].Acta Petrolei Sinica,2017,38(10):1158-1167.
[8]李友川,黄正吉,张功成.渤中坳陷东下段烃源岩评价及油源研究[J].石油学报,2001,22(2):44-48.LI Youchuan,HUANG Zhengji,ZHANG Gongcheng.Evaluation of the lower Dongying source and oil source research in Bozhong depression[J].Acta Petrolei Sinica,2001,22(2):44-48.
[9] HAO Fang,ZHOU Xinhuai,ZHU Yangming,et al.Lacustrine source rock deposition in response to co-evolution of environments and organisms controlled by tectonic subsidence and climate,Bohai Bay Basin,China[J].Organic Geochemistry,2012,42(4):323-339.
[10]刘占红.黄河口凹陷层序地层与旋回地层研究及烃源岩形成条件分析[D].北京:中国地质大学,2007.LIU Zhanhong.Sequence stratigraphy,cyclostratigraphy and the forming conditions of hydrocarbon source rocks in Huanghekou depression[D].Beijing:China University of Geosciences,2007.
[11]夏景生,刘晓涵,王政军,等.渤海湾盆地南堡凹陷西部东营组三段—沙河街组一段砂质碎屑流沉积特征及油气勘探意义[J].石油学报,2017,38(4):399-413.XIA Jingsheng,LIU Xiaohan,WANG Zhengjun,et al.Sedimentary characteristics of sandy debris flow in the 3rd Member of Dongying Formation and the 1st Member of Shahejie Formation of the western Nanpu sag,Bohai Bay Basin and its significance in hydrocarbon exploration[J].Acta Petrolei Sinica,2017,38(4):399-413.
[12]黄正吉,李友川.渤海湾盆地渤中坳陷东营组烃源岩的烃源前景[J].中国海上油气(地质),2002,16(2):118-124.HUANG Zhengji,LI Youchuan.Hydrocarbon source potential of Dongying Formation in Bozhong depression,Bohai Bay Basin[J].China Offshore Oil and Gas(Geology),2002,16(2):118-124.
[13] FANG Yunxin,LIAO Yuhong,WU Liangliang,et al.Oil-source correlation for the paleo-reservoir in the Majiang area and remnant reservoir in the Kaili area,South China[J].Journal of Asian Earth Sciences,2011,41(2):147-158.
[14]张宝收,李美俊,赵青,等.原油中C26-C28三芳甾烷相对含量计算方法及其应用[J].石油实验地质,2016,38(5):692-697.ZHANG Baoshou,LI Meijun,ZHAO Qing,et al.Determining the relative abundance of C26-C28triaromatic steroids in crude oils and its application in petroleum geochemistry[J].Petroleum Geology&Experiment,2016,38(5):692-697.
[15]李美俊,王铁冠,王春江,等.塔河油田奥陶系原油三芳甾分布及原油族群划分[J].中国石油大学学报:自然科学版,2012,36(5):20-24.LI Meijun,WANG Tieguan,WANG Chunjiang,et al.Distribution of triaromatic steroids and oil family classification of Ordovician oils in Tahe oilfield[J].Journal of China University of Petroleum:Edition of Natural Science,2012,36(5):20-24.
[16]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.ZENG Fangang,CHENG Keming.Characteristics of aromatic hydrocarbon biomarkers from lower Palaeozoic marine carbonate rocks in north China[J].Geology-Geochemistry,1998,26(3):33-39.
[17]倪春华,包建平,顾忆.生物降解作用对芳烃生物标志物参数的影响研究[J].石油实验地质,2008,30(4):386-389.NI Chunhua,BAO Jianping,GU Yi.Study of biodegradation effect on aromatic biomarker parameters[J].Petroleum Geology and Experiment,2008,30(4):386-389.
[18]陈建平,邓春萍,宋孚庆,等.用生物标志物定量计算混合原油油源的数学模型[J].地球化学,2007,36(2):205-214.CHEN Jianping,DENG Chunping,SONG Fuqing,et al.Mathematical calculating model using biomarkers to quantitatively determine relative source proportion of mixed oils[J].Geochimica,2007,36(2):205-214.
[19]宋孚庆,张大江,王培荣,等.生物降解混源油混合比例估算方法[J].石油勘探与开发,2004,31(2):67-70.SONG Fuqing,ZHANG Dajiang,WANG Peirong,et al.A contribution evaluation method for biodegraded mixed oils[J].Petroleum Exploration and Development,2004,31(2):67-70.