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渤海海域深层潜山油气地球化学特征及油气来源
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  • 英文篇名:Geochemical characteristics and sources of oil and gas in deep buried hills,Bohai Sea area
  • 作者:李慧 ; 徐云龙 ; 王飞龙 ; 罗小平 ; 于海波
  • 英文作者:Li Huiyong;Xu Yunlong;Wang Feilong;Luo Xiaoping;Yu Haibo;Tianjin Branch Company of CNOOC;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Chengdu University of Technology;College of Energy,Chengdu University of Technology;
  • 关键词:渤海湾盆地 ; 渤海海域 ; 渤中凹陷南部 ; 深层潜山 ; 有机地球化学 ; 烃源灶 ; 生物标志化合物 ; 油源对比
  • 英文关键词:Bohai Bay Basin;;Bohai Sea area;;Southern Bozhong Sag;;Deep buried hill;;Organic geochemistry;;Hydrocarbon source kitchen;;Biomarker;;Oil source correlation
  • 中文刊名:天然气工业
  • 英文刊名:Natural Gas Industry
  • 机构:中海石油(中国)有限公司天津分公司;"油气藏地质及开发工程"国家重点实验室·成都理工大学;成都理工大学能源学院;
  • 出版日期:2019-01-29 16:50
  • 出版单位:天然气工业
  • 年:2019
  • 期:01
  • 基金:国家科技重大专项“渤海潜山成藏综合研究与有利勘探方向”(编号:2016ZX05024-003-010);; 中海石油(中国)有限公司科研项目“渤海海域潜山石油地质特征、典型油气藏成藏机理与有利勘探区带预测”(编号:CCL2014TJXZSS0870)
  • 语种:中文;
  • 页:51-62
  • 页数:12
  • CN:51-1179/TE
  • ISSN:1000-0976
  • 分类号:P618.13
摘要
渤海湾盆地渤海海域渤中19-6深层潜山构造带周缘发育多个富烃深次洼,油气聚集条件复杂,对其油气的有机地球化学特征及主要来源认识尚不明确。为此,利用饱和烃及轻烃色谱、色谱—质谱、天然气组分及碳同位素组分检测等地球化学测试技术对该潜山构造带的原油、天然气与其周缘富烃深次洼烃源岩的地球化学特征进行对比分析,运用油—源生物标志化合物分析技术,系统研究了渤中19-6潜山构造带油气的来源与特征。结果表明:(1)渤中19-6深层潜山构造带周缘凹陷主要发育古近系东营组二段下亚段、东营组三段、沙河街组一段及沙河街组三段上亚段等4套烃源岩,其中东三段和沙三上亚段烃源岩为其主力烃源灶,有机质丰度较高,为偏腐泥混合型有机质类型,已进入生烃高峰期;(2)深层太古界潜山及上覆古近系孔店组天然气为典型的油型气,具有不同成熟度天然气混合特征,成藏过程具有多阶段性;(3)浅层与深层油气来源都具有3套烃源岩混源输入的特征,但仍存在着差异性,其中浅层油气来源以东三段烃源岩的输入为主,并且可能存在着东二下亚段烃源岩的输入,而深层油气来源则以沙三上亚段烃源岩的输入为主。结论认为,该区油气源条件复杂,油气源主要以周缘富烃深次洼内沙三上亚段烃源岩为主,其深层凝析气藏表现出多期次油型气输入的特征。
        Many hydrocarbon-rich deep subsags are developed in the periphery of the BZ19-6 deep buried-hill structural belt in the Bohai Sea area,Bohai Bay Basin,and their hydrocarbon accumulation conditions are complicated.So far,the organic geochemical characteristics and main sources of their oil and gas have not been figured out.In this paper,the geochemical characteristics of crude oil and natural gas in this belt and those of the source rocks of hydrocarbon-rich deep subsags around the buried-hill structure belt were analyzed by means of geochemical testing technologies,such as saturated hydrocarbon and light hydrocarbon chromatography,chromatography–mass spectrometry,detection of natural gas components and carbon isotope components.Then,the sources and characteristics of oil and gas in the BZ19-6 deep buried-hill structural belt were studied systematically by using the oil-source biomarker analysis technology.And the following research results were obtained.First,in the peripheral sags of this belt are mainly developed four sets of source rocks,i.e.,the lower submember of the second Member of Paleogene Dongying Fm(E_2d_2~1),the third Member of Dongying Fm(E_2d_3),the first Member of Shahejie Fm(E_2s_1)and the upper submember of the third Member of Shahejie Fm(E_2s_3~2).Among them,E_2d_3 and E_2s_3~2 are the principal hydrocarbon source kitchens.Their organic abundance is relatively high and their organic matter is of sapropel-prone mixed type.And now they are in the peak stage of hydrocarbon generation.Second,natural gas in the Archean deep buried hill and its overlying Paleogene Kongdian Fm(E_1k)is typical oiltype gas.It presents the mixed characteristics of natural gas with different maturities and multiple stages of hydrocarbon accumulation process.Third,the source of oil and gas in shallow layers is different from that in deep layers,though they both present the mixed source input characteristics of three sets of source rocks.The oil and gas in shallow layers is mainly derived from E_2d_3 source rocks and possibly from E_2d_2~1 source rocks,while the oil and gas in deep layers is mainly derived from E_2s_3~2 source rocks.In conclusion,the hydrocarbon source conditions in this area are complex,the hydrocarbon source is mainly contributed by the E_2s_3~2 source rocks in the hydrocarbon-rich deep subsags in the periphery of this belt,and the deep condensate gas reservoirs are characterized by multi-stage oil-type gas input.
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