东海陆架盆地西湖凹陷平湖斜坡带差异性气侵的成藏模式
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摘要
探讨东海陆架盆地西湖凹陷平湖斜坡带不同油区的油气分布成因。在针对平湖斜坡带油、气关系梳理的基础上,利用原油物性、轻烃、饱和烃等有机地球化学参数与油藏特征对油气分布成因进行分析。结果表明靠近生烃洼陷的低带晚期干气充注程度高,具有高气油比、低含油的凝析气藏特征;中带充注程度低,表现下部为凝析气、上部为早期原油的特征;高带表现纯油藏或少量天然气的油藏特征。平湖斜坡带在早期生油的基础上,晚期干气对平湖组底部早期形成的油藏进行气侵,而受控于输导体发育的差异,不同区带及不同构造受到的气侵程度不同,形成了现今复杂的油气分布关系。
Organic geochemical parameters, such as physical properties of crude oil, light hydrocarbons, saturated hydrocarbons, in combination with the reservoir characteristics, are used to analyze the complicated hydrocarbon distribution mechanism in different zones on the Pinghu Slope of Xihu Sag in the East China Sea shelf basin. The results show that the filling degree of later dry gas in the lower zone near the hydrocarbon-generating sag is high, characteristic of high gas-oil ratio for the condensate gas reservoir and low condensate oil content; the middle zone is in low filling degree, characterized by condensate gas in the lower part and early crude oil in the upper part; and the high zone is characterized by pure oil reservoir or a small amount of natural gas reservoir. Based on the early oil generation and comprehensive study, it is revealed the late dry gas invaded the early-formed reservoirs at the bottom of Pinghu Formation on the Pinghu Slope. Due to the differences in the development of transport conductors, different degrees of gas developed in different zones and structures and formed complex oil-gas relation.
Organic geochemical parameters, such as physical properties of crude oil, light hydrocarbons, saturated hydrocarbons, in combination with the reservoir characteristics, are used to analyze the complicated hydrocarbon distribution mechanism in different zones on the Pinghu Slope of Xihu Sag in the East China Sea shelf basin. The results show that the filling degree of later dry gas in the lower zone near the hydrocarbon-generating sag is high, characteristic of high gas-oil ratio for the condensate gas reservoir and low condensate oil content; the middle zone is in low filling degree, characterized by condensate gas in the lower part and early crude oil in the upper part; and the high zone is characterized by pure oil reservoir or a small amount of natural gas reservoir. Based on the early oil generation and comprehensive study, it is revealed the late dry gas invaded the early-formed reservoirs at the bottom of Pinghu Formation on the Pinghu Slope. Due to the differences in the development of transport conductors, different degrees of gas developed in different zones and structures and formed complex oil-gas relation.
引文
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[12] 苏奥,陈红汉.东海盆地西湖凹陷油岩地球化学特征及原油成因来源[J].地球科学,2015,40(6):1072-1082.Su A,Chen H H.Geochemical characteristics of oil and source rock,origin and genesis of oil in Xihu depression,East China Sea basin[J].Earth Science,2015,40(6):1072-1082.(in Chinese)
[13] 殷世艳,叶加仁,雷闯,等.西湖凹陷平北地区平湖组原油地球化学特征[J].新疆石油地质,2014,35(5):542-546.Yin S Y,Ye J R,Lei C,et al.Geochemical characteristics of Pinghu crude oils in Pingbei area of Xihu sag[J].Xinjiang Petroleum Geology,2014,35(5):542-546.(in Chinese)
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[15] Thompson K F.Fractionated aromatic petroleum and the generation of gas-condensates[J].Organic Geochemistry,1987,11(6):573-590.
[16] Zhuze T P,Ushakova G S,Yuehkevich G N.The influence of high pressures and temperatures on the content and properties of condensate in the gas phase of gas-oil deposits[J].Geochemistry,1962,8:797-806.
[17] 蔡忠贤,吴楠,杨海军,等.轮南低凸起凝析气藏的蒸发分馏作用机制[J].天然气工业,2009,29(4):21-24.Cai Z X,Wu N,Yang H J,et al.Mechanism of evaporative fractionation in condensate gas reservoirs in Lunnan low salient[J].Natural Gas Industry,2009,29(4):21-24.(in Chinese)
[18] 张海峰.塔里木盆地古生界原油中烷基苯地球化学特征[D].北京:中国地质大学档案馆,2015.Zhang H F.Geochemistry of Alkylbenzenes in the Paleozoic Oils from the Tarim Basin,NW China[D].Beijing:The Archive of China University of Geosciences,2015.(in Chinese)
[19] 卓勤功,赵孟军,谢会文,等.库车前陆盆地大北地区储层沥青与油气运聚关系[J].石油实验地质,2011,33(2):193-196.Zhuo Q G,Zhao M J,Xie H W,et al.Relationship between reservoir bitumen and hydrocarbon migration in Dabei region,Kuqa Foreland Basin[J].Petroleum Geology & Experiment,2011,33(2):193-196.(in Chinese)
[20] 纪红,黄光辉,成定树,等.塔里木盆地库车坳陷大宛齐-大北地区原油轻烃特征及地球化学意义[J].天然气地球科学,2017,28(6):965-974.Ji H,Huang G H,Cheng D S,et al.Geochemical application of light hydrocarbons in Kuqa Depression of Tarim Basin:Case study of Dawanqi-Dabei areas[J].Natural Gas Geoscience,2017,28(6):965-974.(in Chinese)
[21] 韩霞,田世澄,张占文.高蜡油成因及其形成聚集的地球化学效应[J].地质科技情报,2007,26(5):73-78.Han X,Tian S C,Zhang Z W.Dynamics processes and geochemistry effects for the formation and accumulation of high-wax oils[J].Geological Science and Technology Information,2007,26(5):73-78.(in Chinese)
[22] 陈建平,邓春萍,王绪龙,等.准噶尔盆地南缘凝析油、蜡质油与稠油的形成机理[J].中国科学:地球科学,2017,47(5):63-81.Chen J P,Deng C P,Wang X L,et al.Formation mechanism of condensates,waxy and heavy oils in the southern margin of Junggar Basin,NW China[J].Scientia Sinica Terrae,2017,47(5):63-81.(in Chinese)
[23] 罗晓容,雷裕红,张立宽,等.油气运移输导层研究及量化表征方法[J].石油学报,2012,33(3):428-436.Luo X R,Lei Y H,Zhang L K,et al.Characterization of carrier formation for hydrocarbon migration:Concepts and approaches [J].Acta Petrolei Sinica,2012,33(3):428-436.(in Chinese)
[2] 江兴歌,何将启,陈拥锋.东海西湖凹陷平湖组油气运移特征模拟分析[J].石油实验地质,2003,25(增刊1):614-620.Jiang X G,He J Q,Chen Y F.Simulation analysis of the migration characteristics of hydrocarbon in the Pinghu Formation of the Xihu Depression,the East China Sea[J].Petroleum Geology & Experiment,2003,25(S1):614-620.(in Chinese)
[3] 何将启,梁世友,陈拥锋,等.东海盆地西湖凹陷新生代构造演化对油气的控制作用——以平湖组油气响应为例[J].石油实验地质,2008,30(3):221-226.He J Q,Liang S Y,Chen Y F,et al.Control on petroleum by Cenozoic tectonic evolution in the Xihu Sag,the East China Sea basin:Taking petroleum response of the Pinghu Formation as an Example[J].Petroleum Geology & Experiment,2008,30(3):221-226.(in Chinese)
[4] 宋小勇.东海盆地西湖凹陷构造样式及其对油气聚集的控制[D].北京:中国地质大学档案馆,2007.Song X Y.Structural Style in Xihu Depression,the East China Sea Basin and It Control on the Oil-Gas Accumulation[D].Beijing:The Archive of China University of Geosciences,2007.(in Chinese)
[5] 李敏.西湖凹陷平湖斜坡带油气成藏研究[D].北京:中国地质大学档案馆,2012.Li M.Study on Accumulation of Oil and Gas in Pinghu Slope Belt of Xihu Depression[D].Beijing:The Archive of China University of Geosciences,2012.(in Chinese)
[6] 陶士振,邹才能.东海盆地西湖凹陷天然气成藏及分布规律[J].石油勘探与开发,2005,32(4):103-110.Tao S Z,Zou C N.Accumulation and distribution of natural gases in Xihu Sag,East China Sea Basin[J].Petroleum Exploration and Development,2005,32(4):103-110.(in Chinese)
[7] 唐友军,张坤,胡森清,等.西湖凹陷平湖斜坡带原油轻烃地球化学特征[J].石油天然气学报,2014,36(9):28-33.Tang Y J,Zhang K,Hu S Q,et al.Geochemical characteristics of light hydrocarbon in Pinghu slope of Xihu sag[J].Journal of Oil and Gas Technology,2014,36(9):28-33.(in Chinese)
[8] 刘金水.西湖凹陷平湖构造带地层压力特征及与油气分布的关系[J].成都理工大学学报(自然科学版),2015,42(1):60-69.Liu J S.Characteristics of formation pressure and their relationship with hydrocarbon distribution in Pinghu tectonic belt of Xihu sag,East China Sea[J].Journal of Chengdu University of Technology (Science & Technology Edition),2015,42(1):60-69.(in Chinese)
[9] 叶加仁,顾惠荣,贾健谊.东海西湖凹陷油气地质条件及其勘探潜力[J].海洋地质与第四纪地质,2008,28(4):111-116.Ye J R,Gu H R,Jia J Y.Petroleum geological condition and exploration potential of Xihu depression,East China Sea[J].Marine Geology & Quaternary Geology,2008,28(4):111-116.(in Chinese)
[10] 高伟中,杨彩虹,赵洪.东海盆地西湖凹陷热事件对储层的改造及其机理探讨[J].石油实验地质,2015,37(5):548-554.Gao W Z,Yang C H,Zhao H.Reservoir formation and modification controlled by thermal events in the Xihu sag,East China Sea basin[J].Petroleum Geology & Experiment,2015,37(5):548-554.(in Chinese)
[11] 苏奥,陈红汉,雷川,等.流体包裹体PVTx模拟研究油气充注期次和古压力恢复:以西湖凹陷平湖构造带为例[J].地质科技情报,2014,33(6):137-142.Su A,Chen H H,Lei C,et al.Application of PVTx simulation of fluid inclusions to estimate petroleum charge stages and restore pressure:Using Pinghu structural belt in Xihu depression as an example [J].Geological Science and Technology Information,2014,33(6):137-142.(in Chinese)
[12] 苏奥,陈红汉.东海盆地西湖凹陷油岩地球化学特征及原油成因来源[J].地球科学,2015,40(6):1072-1082.Su A,Chen H H.Geochemical characteristics of oil and source rock,origin and genesis of oil in Xihu depression,East China Sea basin[J].Earth Science,2015,40(6):1072-1082.(in Chinese)
[13] 殷世艳,叶加仁,雷闯,等.西湖凹陷平北地区平湖组原油地球化学特征[J].新疆石油地质,2014,35(5):542-546.Yin S Y,Ye J R,Lei C,et al.Geochemical characteristics of Pinghu crude oils in Pingbei area of Xihu sag[J].Xinjiang Petroleum Geology,2014,35(5):542-546.(in Chinese)
[14] 戴金星.天然气碳氢同位素特征和各类天然气鉴别[J].天然气地球科学,1993,4(2/3):1-40.Dai J X.C-H isotopic characteristics and identify kinds of natural gas [J].Natural Gas Geoscience,1993,4(2/3):1-40.(in Chinese)
[15] Thompson K F.Fractionated aromatic petroleum and the generation of gas-condensates[J].Organic Geochemistry,1987,11(6):573-590.
[16] Zhuze T P,Ushakova G S,Yuehkevich G N.The influence of high pressures and temperatures on the content and properties of condensate in the gas phase of gas-oil deposits[J].Geochemistry,1962,8:797-806.
[17] 蔡忠贤,吴楠,杨海军,等.轮南低凸起凝析气藏的蒸发分馏作用机制[J].天然气工业,2009,29(4):21-24.Cai Z X,Wu N,Yang H J,et al.Mechanism of evaporative fractionation in condensate gas reservoirs in Lunnan low salient[J].Natural Gas Industry,2009,29(4):21-24.(in Chinese)
[18] 张海峰.塔里木盆地古生界原油中烷基苯地球化学特征[D].北京:中国地质大学档案馆,2015.Zhang H F.Geochemistry of Alkylbenzenes in the Paleozoic Oils from the Tarim Basin,NW China[D].Beijing:The Archive of China University of Geosciences,2015.(in Chinese)
[19] 卓勤功,赵孟军,谢会文,等.库车前陆盆地大北地区储层沥青与油气运聚关系[J].石油实验地质,2011,33(2):193-196.Zhuo Q G,Zhao M J,Xie H W,et al.Relationship between reservoir bitumen and hydrocarbon migration in Dabei region,Kuqa Foreland Basin[J].Petroleum Geology & Experiment,2011,33(2):193-196.(in Chinese)
[20] 纪红,黄光辉,成定树,等.塔里木盆地库车坳陷大宛齐-大北地区原油轻烃特征及地球化学意义[J].天然气地球科学,2017,28(6):965-974.Ji H,Huang G H,Cheng D S,et al.Geochemical application of light hydrocarbons in Kuqa Depression of Tarim Basin:Case study of Dawanqi-Dabei areas[J].Natural Gas Geoscience,2017,28(6):965-974.(in Chinese)
[21] 韩霞,田世澄,张占文.高蜡油成因及其形成聚集的地球化学效应[J].地质科技情报,2007,26(5):73-78.Han X,Tian S C,Zhang Z W.Dynamics processes and geochemistry effects for the formation and accumulation of high-wax oils[J].Geological Science and Technology Information,2007,26(5):73-78.(in Chinese)
[22] 陈建平,邓春萍,王绪龙,等.准噶尔盆地南缘凝析油、蜡质油与稠油的形成机理[J].中国科学:地球科学,2017,47(5):63-81.Chen J P,Deng C P,Wang X L,et al.Formation mechanism of condensates,waxy and heavy oils in the southern margin of Junggar Basin,NW China[J].Scientia Sinica Terrae,2017,47(5):63-81.(in Chinese)
[23] 罗晓容,雷裕红,张立宽,等.油气运移输导层研究及量化表征方法[J].石油学报,2012,33(3):428-436.Luo X R,Lei Y H,Zhang L K,et al.Characterization of carrier formation for hydrocarbon migration:Concepts and approaches [J].Acta Petrolei Sinica,2012,33(3):428-436.(in Chinese)
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