方里集地区沙河街组烃源岩地球化学特征分析及油源对比
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摘要
针对东濮凹陷方里集地区沙河街组烃源岩地球化学特征不明和油源认识不清的问题,应用有机地球化学方法对比分析了不同层段烃源岩有机质丰度、类型、成熟度和沉积环境特征,明确了不同油藏的石油来源。研究结果表明,方里集地区Es_3~2烃源岩有机质丰度中等—高,干酪根类型为II—III型,处于成熟—高熟阶段,是有效的烃源岩,而Es_1~2和Es_3~1烃源岩均难以大量生烃;沙河街组烃源岩沉积于还原—弱氧化环境,Es_1~2和Es_3~1烃源岩沉积于淡水—咸水环境,Es_3~2为淡水—微咸水环境。方里集地区油藏为自生自储型,其中Es_3~2下部原油来源于Es_3~2下部烃源岩,Es_3~1及Es_3~2上部原油主要来源于Es_3~2上部烃源岩。
The geochemical characteristics of Shahejie Formation source rocks in Fangliji area,Dongpu sag,is not clarified and the origin of hydrocarbons is not determined.With organic geochemical method,based on comparison analysis of organic matter content,type,maturity and depositional environment characteristics of sources rocks from different layers,oil sources of different reservoirs are clarified.The results show that the source rocks of Es_3~2 with medium to high organic matter abundance,type II and III dominated kerogen type and middle to high mature stage are most effective,while the source rocks of Es_1~2 and Es_3~1 with limited hydrocarbon generation potential are less effective.The source rocks in Shahejie Formation are deposited in reducing to weakly oxidizing environments.The source rocks in Es_1~2 and Es_3~1 are mainly deposited in fresh to brackish water environments,while the depositional environment of source rocks in Es_3~2 tends to be fresh to weakly brackish water environments.The reservoir in Fangliji area is self-generating and self-preserving,the oil in the bottom of Es_3~2 mainly originates from the source rocks in the bottom of Es_3~2,while the oil in Es31 and the top of Es_3~2 is mainly from the source rocks in the top of Es_3~2.
The geochemical characteristics of Shahejie Formation source rocks in Fangliji area,Dongpu sag,is not clarified and the origin of hydrocarbons is not determined.With organic geochemical method,based on comparison analysis of organic matter content,type,maturity and depositional environment characteristics of sources rocks from different layers,oil sources of different reservoirs are clarified.The results show that the source rocks of Es_3~2 with medium to high organic matter abundance,type II and III dominated kerogen type and middle to high mature stage are most effective,while the source rocks of Es_1~2 and Es_3~1 with limited hydrocarbon generation potential are less effective.The source rocks in Shahejie Formation are deposited in reducing to weakly oxidizing environments.The source rocks in Es_1~2 and Es_3~1 are mainly deposited in fresh to brackish water environments,while the depositional environment of source rocks in Es_3~2 tends to be fresh to weakly brackish water environments.The reservoir in Fangliji area is self-generating and self-preserving,the oil in the bottom of Es_3~2 mainly originates from the source rocks in the bottom of Es_3~2,while the oil in Es31 and the top of Es_3~2 is mainly from the source rocks in the top of Es_3~2.
引文
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[2]高红灿,郑荣才,陈发亮,等.渤海湾盆地东濮凹陷古近系沙河街组层序地层[J].石油与天然气地质,2011,32(6):839-850.GAO Hongcan,ZHENG Rongcai,CHEN Faliang,et al.Sequence stratigraphy of the Paleogene Shahejie Formation in Dongpu Sag,Bohai Bay Basin[J].Oil&Gas Geology,2011,32(6):839-850.
[3]武晓玲,卢福长,张云献,等.东濮凹陷濮深8井油气与烃源岩地球化学特征[J].石油勘探与开发,2000,27(5):32-35.WU Xiaoling,LU Fuchang,ZHANG Yunxian,et al.Geochemical characteristic study of oil-gas and source rocks in Well Pushen 8 in Dongpu depression[J].Petroleum Exploration and Development,2000,27(5):32-35.
[4]张云献,罗小平,彭渤莹,等.东濮凹陷濮深8井原油地球化学特征及油源对比[J].西安工程学院学报,1999,21(3):17-20.ZHANG Yunxian,LUO Xiaoping,PENG Boying,et al.Geochemical behavior and oil source correlation of oil from Well Pushen 8 of Dongpu depression[J].Journal of Xi’an Engineering University,1999,21(3):17-20.
[5]张克鑫,漆家福,赵衍彬,等.新生代东濮凹陷构造特征及其演化[J].新疆石油地质,2007,28(6):714-717.ZHANG Kexin,QI Jiafu,ZHAO Yanbin,et al.Structure and evolution of Cenozoic in Dongpu Sag[J].Xinjiang Petroleum Geology,2007,28(6):714-717.
[6]陈建平,黄第藩,陈建军,等.酒东盆地油气生成和运移[M].北京:石油工业出版社,1996:15.
[7]柳广弟,主编.石油地质学[M].北京:石油工业出版社,2009:153-165.
[8]卢双舫,张敏,主编.油气地球化学[M].北京:石油工业出版社,2009:206-220.
[9]HUANG W Y,MEINCHEIN W G.Sterols as ecological indicators[J].Geochimica et Cosmochinical Acta,1979,43(5):739-745.
[10]卢学军,高平,丁修建,等.二连盆地阿尔凹陷下白垩统烃源岩地球化学特征及油源对比[J].岩性油气藏,2014,26(3):101-108.LU Xuejun,GAO Ping,DING Xiujian,et al.Geochemical characteristics and source rocks and oil-source correlation of the Lower Cretaceous in Aer Sag,Erlian Basin[J].Lithologic Reservoirs,2014,26(3):101-108.
[11]PETERS K E,FRASTER T H,AMRIS W,et al.Geochemistry of crude oils from eastern Indonesia[J].AAPG Bulletin,1999,83(12):1927-1942.
[12]柳广弟,杨伟伟,冯渊,等.鄂尔多斯盆地陇东地区延长组原油地球化学特征及成因类型划分[J].地学前缘,2013,20(2):108-115.LIU Guangdi,YANG Weiwei,FENG Yuan,et al.Geochemical characteristics and genetic types of crude oil from Yanchang Formation in Longdong area,Ordos Basin[J].Earth Science Frontiers,2013,20(2):108-115.
[13]邬立言,顾信章.热解技术在我国生油岩研究中的应用[J].石油学报,1986,7(2):13-19.WU Liyan,GU Xinzhang.The application of pyrolysis technique in source rock research[J].Acta Petrolei Sinica,1986,7(2):13-19.
[14]PETERS K E,WALTERS C C,MOLDOWAN J M.The biomarker guide,Volume 2,biomarkers and isotopes in petroleum systems and earth history[M].2nd Edition.Cambridge:Cambridge University Press,2005:475-625.
[15]BRAY E E,EVANS E D.Distribution of n-paraffins as a clue to recognition of source beds[J].Geochimical et Cosmochimica Acta,1961,22(1):2-15.
[16]SCALAN R S,SMITH J E.An improved measure of the oldeven predominance in the normal alkanes of sediment extracts and petroleum[J].Geochimica et Cosmochimical Acta,1970,34(5):611-620.
[17]SEIFERT W K,MOLDOWAN J M.Use of biological markers in petroleum exploration[C]∥JOHNS R B.Biological marks in the sedimentary record,Amsterdam:Elsevier,1986:261-290.
[18]SEIFERT W K,MOLDOWAN J M.Paleoreconstruction by biological markers[J].Geochimica et Cosmochimica Acta,1986,45(6):783-794.
[19]SINNINGHE DAMSTE J S,KENIG F,KOOPMANS M P,et al.Evidence for gammacerane as an indicator of water column stratification[J].Geochimica et Cosmochimica Acta,1995,59(9):1895-1900.
[20]MOLDOWAN J M,SEIFERT W K,GALLEGOS E J.Relationship between petroleum composition and depositional environment of petroleum source rocks[J].AAPG Bulletin,1985,69(8):1255-1268.
[21]王朋,柳广弟,曹喆,等.查干凹陷下白垩统稠油地球化学特征及成因分析[J].沉积学报,2015,33(6):1265-1274.WANG Peng,LIU Guangdi,CAO Zhe,et al.Geochemistry and origin of heavy oil in Lower Cretaceous of Chagan Depression[J].Acta Sedimentological Sinica,2015,33(6):1265-1274.
[22]林壬子,王培荣,臧允键,等.矿物燃料中多环芳烃的石油地球化学意义[C]∥中国石油学会石油地质专业委员会.有机地球化学论文集.北京:地质出版社,1987:120-140.
[23]夏燕青,孟仟祥,王红勇,等.芴系列化合物的成因[J].沉积学报,1999,17(4):655-658.XIA Yanqing,MENG Qianxiang,WANG Hongyong,et al.The mechanism on formation of fluorene series compounds[J].Acta Sedimentologica Sinica,1999,17(4):655-658.
[24]黄第藩,张大江,李晋超.论4-甲基甾烷和孕甾烷的成因[J].石油勘探与开发,1989,16(3):8-15.HUANG Difan,ZHANG Dajiang,LI Jinchao.On origin of 4-methyl steranes and pregnanes[J].Petroleum Exploration and Development,1989,16(3):8-15.
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