东营凹陷北带民丰洼陷深层凝析油藏成藏史及其勘探意义
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摘要
盆地深层高温、高压特点决定其油气成藏的复杂性。在东营凹陷北带民丰洼陷丰深1井深层流体包裹体宿主矿物成岩序次、烃类包裹体荧光光谱分析、显微测温以及石油包裹体热动力模拟研究的基础上,结合盆模技术、天然气碳同位素地球化学和原油裂解动力学,探讨了东营凹陷北带深层丰深1井凝析油气成藏过程中的PVTx-t(压力-体积-温度-组分-时间)演化史。结果表明,丰深1井沙河街组四段下亚段(简称沙四下亚段)伴随常压—低幅超压—常压的压力旋回相应地发生过2幕原油和1幕天然气充注。其中发淡黄色—蓝白色荧光油充注代表了第1幕油充注,形成早期油藏,晚期深部原油裂解气再次充注并对早期油藏施加了调整改造之影响,以至最终形成了现今的凝析油藏(第2幕蓝色荧光油)。丰深1井深层油气成藏特点决定该区构造高部位以油藏、深部以原油裂解气藏、中部以凝析油气藏为特征的分布格局。这种深层油气成藏模式对中国东部其他断陷盆地深层的油气勘探具有一定的指导意义。
Characteristics of high temperature and high pressure in a deeply buried reservoir of basins determine the complicacy of petroleum migration and accumulation.Based on the petrologic sequence of host minerals in fluid inclusions,fluorescence spectrum analysis of hydrocarbon-bearing fluid inclusions,microthermometry and thermodynamic modeling of petroleum inclusions and integrated with basin modeling,natural gas carbon isotopic geochemistry and kinetics of crude oil cracking,we discussed the pressure-volume-temperature-composition-time(PVTx-t)evolutionary history of deeply buried condensate accumulation of Well Fengshen1 in the northern Dongying depression.The result showed that accompanied by a pressure evolutionary cycle of normal pressure to lower overpressure and then to normal pressure again,there occurred accordingly two oil-charging episodes and one gas-charging episode in the lower sub-member of Member 4 of Shahejie Formation(Es4x)of Well Fengshen1 in the northern Dongying depression.The first episode oil featured by yellow to blue-white florescence color contributed to the early oil accumulation,and the present gas condensate pool with the second episode oil featured by blue florescence color,was formed due to the late recharging of deep oil cracking gas and the alteration of the former oil pool.Characteristics of deeply buried oil-gas accumulation in Well Fengshen1 determined the distribution pattern of hydrocarbons in the study area,which shows the oil reservoir in the structural high,the oil-cracking-gas reservoir in deeply buried formations,and the gas condensate reservoir between them.This hydrocarbon accumulation pattern in deeply buried formations in Minfeng sag is of a certain instructive significance in petroleum exploration of deeply buried formations in other rift basins in eastern China.
Characteristics of high temperature and high pressure in a deeply buried reservoir of basins determine the complicacy of petroleum migration and accumulation.Based on the petrologic sequence of host minerals in fluid inclusions,fluorescence spectrum analysis of hydrocarbon-bearing fluid inclusions,microthermometry and thermodynamic modeling of petroleum inclusions and integrated with basin modeling,natural gas carbon isotopic geochemistry and kinetics of crude oil cracking,we discussed the pressure-volume-temperature-composition-time(PVTx-t)evolutionary history of deeply buried condensate accumulation of Well Fengshen1 in the northern Dongying depression.The result showed that accompanied by a pressure evolutionary cycle of normal pressure to lower overpressure and then to normal pressure again,there occurred accordingly two oil-charging episodes and one gas-charging episode in the lower sub-member of Member 4 of Shahejie Formation(Es4x)of Well Fengshen1 in the northern Dongying depression.The first episode oil featured by yellow to blue-white florescence color contributed to the early oil accumulation,and the present gas condensate pool with the second episode oil featured by blue florescence color,was formed due to the late recharging of deep oil cracking gas and the alteration of the former oil pool.Characteristics of deeply buried oil-gas accumulation in Well Fengshen1 determined the distribution pattern of hydrocarbons in the study area,which shows the oil reservoir in the structural high,the oil-cracking-gas reservoir in deeply buried formations,and the gas condensate reservoir between them.This hydrocarbon accumulation pattern in deeply buried formations in Minfeng sag is of a certain instructive significance in petroleum exploration of deeply buried formations in other rift basins in eastern China.
引文
[1]胡晓庆,金强,王秀红,等.济阳坳陷民丰地区天然气成因[J].石油与天然气地质,2009,30(1):85-89.Hu Xiaoqing,Jin Qiang,Wang Xiuhong,et al.Origin of naturalgas in Mingfeng area,the Jiyang Depression[J].Oil&Gas Geol-ogy,2009,30(1):85-89.
[2]李文涛.民丰洼陷深层天然气地球化学成因[J].油气地质与采收率,2009,16(2):36-38.Li Wentao.Analysis on geochemical genesis of deep buried natu-ral gas in Minfeng Sag[J].Petroleum Geology and Recovery Effi-ciency,2009,16(2):36-38.
[3]宋国奇,金强,王力,等.东营凹陷深层沙河街组天然气生成动力学研究[J].石油学报,2009,30(5):672-677.Song Guoqi,Jin Qiang,Wang Li,et al.Study on kinetics for genera-ting natural gas of Shahejie Formation in deep buried sags of Dongy-ing Depression[J].Acta Petrolei Sinica,2009,30(5):672-677.
[4]王茹.东营凹陷北带深层Es4下盐下段轻质油地球化学特征及油源探讨[J].天然气地球科学,2009,20(2):278-281.Wang Ru.Geochemical characteristics and source of light oil inthe deep Es4lower layers underlying salt in the northern Dongy-ing Sag[J].Natural Gas Geoscience,2009,20(2):278-281.
[5]丁飞,蔡进功,隋风贵,等.东营凹陷深层烃源岩生物标志物特征及其意义[J].沉积学报,2011,29(1):192-198.Ding Fei,Cai Jingong,Sui Fenggui,et al.Characteristics of biomarkerand its implications of deep source rocks from northern Dongying de-pression[J].Acta Sedimentologica Sinica,2011,29(1):192-198.
[6]蔡东梅.东营凹陷利津-民丰地区中深层油型裂解气成藏机理研究[D].东营:中国石油大学,2007.Cai Dongmei.Research on the pool-forming mechanism of pyrolysisgas in the medium-deep zone of Lijin and Minfeng area,Dongying De-pression[D].Dongying:China University of Petroleum,2007.
[7]宋国奇,蒋有录,刘华,等.东营凹陷利津—民丰地区中深层裂解气成藏史[J].天然气工业,2009,29(4):14-17.Song Guoqi,Jiang Youlu,Liu Hua,et al.Pooling history ofcracked gas in middle-deep reservoirs in Lijin-Minfeng areas ofthe Dongying Sag[J].Natural Gas Industry,2009,29(4):14-17.
[8]孙秀丽,陈红汉,宋国奇,等.断陷盆地深层油气成藏主控因素分析——以东营凹陷北带胜坨地区为例[J].石油学报,2010,31(3):386-393.Sun Xiuli,Chen Honghan,Song Guoqi,et al.Hydrocarbon accu-mulation period and its controlling factors in deep formations ofShengtuo area in Dongying Depression[J].Acta Petrolei Sinica,2010,31(3):386-393.
[9]胜利油田石油地质志编写组.中国石油地质志:第六卷[M].北京:石油工业出版社,1987:32-47.Petroleum Geology Compiling Group of Shengli Oilfield.Petrole-um geology of China:Vol.6[M].Beijing:Petroleum IndustryPress,1987:32-47.
[10]吴智平,韩文功.济阳坳陷早晚第三纪沉积间断地层剥蚀量研究[J].中国海上油气(地质),2000,14(5):320-323.Wu Zhiping,Han Wengong.Erosiveness under the hiatus be-tween Paleogene and Neogene in Jiyang Depression[J].ChinaOffshore Oil and Gas(Geology),2000,14(5):320-323.
[11]Gong Y,Wang L,Liu S,et al.Distribution characteristics of terrestrialheat flow density in Jiyang depression of Shengli Oilfield,East China[J].Science in China Series D:Earth Sciences,2004,47(9):804-812.
[12]Ungerer P,Behar F,Villalba M,et al.Kinetic modelling of oilcracking[J].Organic Geochemistry,1988,13:857-868.
[13]Tsuzuki N,Takeda N,Suzuki M,et al.The kinetic modeling ofoil cracking by hydrothermal pyrolysis experiments[J].Interna-tional Journal of Coal Geology,1999,39(1/3):227-250.
[14]Behar F,Lorant F,Mazeas L.Elaboration of a new compositionalkinetic schema for oil cracking[J].Organic Geochemistry,2008,39(6):764-782.
[15]Kuo L C,Eric Michael G.A multicomponent oil-cracking kineticsmodel for modeling preservation and composition of reservoiredoils[J].Organic Geochemistry 1994,21(8/9):911-925.
[16]Vandenbroucke M,Behar F,Rudkiewicz J L.Kinetic modelling ofpetroleum formation and cracking:implications from the highpressure/high temperature Elgin Field(UK,North Sea)[J].Or-ganic Geochemistry,1999,30(9):1105-1125.
[17]Baumgartner M,Bakker R J.CaCl2-hydrate nucleation in syntheticfluid inclusions[J].Chemical Geology,2009,265(3/4):335-344.
[18]平宏伟,陈红汉,宋国奇,等.油气充注成藏贡献度及其意义[J].地球科学——中国地质大学学报,2012,37(1):163-170.Ping Hongwei,Chen Honghan,Song Guoqi,et al.Contributionsdegree of petroleum charging to oil and gas accumulation and itssignificance[J].Earth Science:Journal of China University of Ge-osciences,2012,37(1):163-170.
[19]Thiéry R,Pironon J,Walgenwitz F,et al.Individual characteriza-tion of petroleum fluid inclusions(composition and P-T trappingconditions)by microthermometry and confocal laser scanning mi-croscopy:inferences from applied thermodynamics of oils[J].Ma-rine Petroleum Geology,2002,19(7):847-859.
[20]Prinzhofer A A,Huc A Y.Genetic and post-genetic molecularand isotopic fractionations in natural gases[J].Chemistry Geolo-gy,1995,126(3/4):281-290.
[21]Tian H,Xiao X,Wilkins R W T,et al.Genetic origins of marinegases in the Tazhong area of the Tarim basin,NW China:impli-cations from the pyrolysis of marine kerogens and crude oil[J].International Journal of Coal Geology,2010,82(1/2):17-26.
[22]Guo L,Xiao X,Tian H,et al.Distinguishing gases derived from oilcracking and kerogen maturation:insights from laboratory pyrolysisexperiments[J].Organic Geochemistry,2009,40(10):1074-1084.
[23]Ricchiuto T,Schoell M.Origin of natural gases in the Apulianbasin in south Italy:a case history of mixing of gases of deep andshallow origin[J].Organic Geochemistry,1988,13:311-318.
[24]Jenden P D,Drazan D J,Kaplan I R.Mixing of thermogenic natu-ral gases in Northern Appalachian basin[J].AAPG Bulletin,1993,77:980-998.
[25]罗霞.济阳坳陷不同类型天然气成因机制及气田形成有利条件分析[R].东营:中国石化胜利油田公司,2005.Luo Xia.Origin of different types of natural gas and analysis ofadvantageous conditions of natual gas reservior in Jiyang depres-sion[R].Dongying:Sinopec Shengli Oil field Company,2005.
[26]陈建渝.济阳坳陷裂解气成藏系统研究[R].东营:中国石化胜利油田地质科学院,2005.Chen Jianyu.Research on cracking gas accumulation system inJiyang depression[R].Dongying:Research Institute of GeologicalScience,Sinopec Shengli Oilfield Company,2005.
[27]李延均.济阳坳陷烃类相态演化及深层资源潜力评价[R].东营:中国石化胜利油田地质科学院,2008.Li Yanjun.Phase evolution and resource evaluation of deeply bur-ied reservior in Jiyang depression[R].Dongying:Research Instituteof Geological Science,Sinopec Shengli Oilfield Company,2008.
[28]金强.山东胜利探区深层天然气生成模式研究[R].东营:中国石化胜利油田地质科学院,2008.Jin Qiang.Research on the model of natural gas generation inShengli Oilfield[R].Dongying:Research Institute of GeologicalScience,Sinopec Shengli Oilfield Company,2008.
[29]Xu Y,Shen P.A study of natural gas origins in China[J].AAPGBulletin,1996,80(10):1604-1614.
[30]Chen J,Xu Y,Huang D.Geochemical characteristics and origin ofnatural gas in Tarim Basin,China[J].AAPG Bulletin,2000,84(5):591-606.
[31]Aali J,Rahimpour-Bonab H,Kamali M R.Geochemistry and ori-gin of the world's largest gas field from Persian Gulf,Iran[J].JPetrol.Sci.Eng.,2006,50(3/4):161-175.
[32]Liu Q,Chen M,Liu W,et al.Origin of natural gas from the Or-dovician paleo-weathering crust and gas-filling model in Jingbiangas field,Ordos Basin,China[J].Journal of Asian Earth Sci-ences,2009,35(1/2):74-88.
[33]Zhu W,Huang B,Mi L,et al.Geochemistry,origin,and deep-wa-ter exploration potential of natural gases in the Pearl RiverMouth and Qiongdongnan basins,South China Sea[J].AAPGBulletin,2009,93(6):741-761.
[34]Hantschel T,Kauerauf A I.Fundamentals of basin and petroleumsystems modeling[M].Berlin,Heidelberg:Springer-Verlag,2009.
[2]李文涛.民丰洼陷深层天然气地球化学成因[J].油气地质与采收率,2009,16(2):36-38.Li Wentao.Analysis on geochemical genesis of deep buried natu-ral gas in Minfeng Sag[J].Petroleum Geology and Recovery Effi-ciency,2009,16(2):36-38.
[3]宋国奇,金强,王力,等.东营凹陷深层沙河街组天然气生成动力学研究[J].石油学报,2009,30(5):672-677.Song Guoqi,Jin Qiang,Wang Li,et al.Study on kinetics for genera-ting natural gas of Shahejie Formation in deep buried sags of Dongy-ing Depression[J].Acta Petrolei Sinica,2009,30(5):672-677.
[4]王茹.东营凹陷北带深层Es4下盐下段轻质油地球化学特征及油源探讨[J].天然气地球科学,2009,20(2):278-281.Wang Ru.Geochemical characteristics and source of light oil inthe deep Es4lower layers underlying salt in the northern Dongy-ing Sag[J].Natural Gas Geoscience,2009,20(2):278-281.
[5]丁飞,蔡进功,隋风贵,等.东营凹陷深层烃源岩生物标志物特征及其意义[J].沉积学报,2011,29(1):192-198.Ding Fei,Cai Jingong,Sui Fenggui,et al.Characteristics of biomarkerand its implications of deep source rocks from northern Dongying de-pression[J].Acta Sedimentologica Sinica,2011,29(1):192-198.
[6]蔡东梅.东营凹陷利津-民丰地区中深层油型裂解气成藏机理研究[D].东营:中国石油大学,2007.Cai Dongmei.Research on the pool-forming mechanism of pyrolysisgas in the medium-deep zone of Lijin and Minfeng area,Dongying De-pression[D].Dongying:China University of Petroleum,2007.
[7]宋国奇,蒋有录,刘华,等.东营凹陷利津—民丰地区中深层裂解气成藏史[J].天然气工业,2009,29(4):14-17.Song Guoqi,Jiang Youlu,Liu Hua,et al.Pooling history ofcracked gas in middle-deep reservoirs in Lijin-Minfeng areas ofthe Dongying Sag[J].Natural Gas Industry,2009,29(4):14-17.
[8]孙秀丽,陈红汉,宋国奇,等.断陷盆地深层油气成藏主控因素分析——以东营凹陷北带胜坨地区为例[J].石油学报,2010,31(3):386-393.Sun Xiuli,Chen Honghan,Song Guoqi,et al.Hydrocarbon accu-mulation period and its controlling factors in deep formations ofShengtuo area in Dongying Depression[J].Acta Petrolei Sinica,2010,31(3):386-393.
[9]胜利油田石油地质志编写组.中国石油地质志:第六卷[M].北京:石油工业出版社,1987:32-47.Petroleum Geology Compiling Group of Shengli Oilfield.Petrole-um geology of China:Vol.6[M].Beijing:Petroleum IndustryPress,1987:32-47.
[10]吴智平,韩文功.济阳坳陷早晚第三纪沉积间断地层剥蚀量研究[J].中国海上油气(地质),2000,14(5):320-323.Wu Zhiping,Han Wengong.Erosiveness under the hiatus be-tween Paleogene and Neogene in Jiyang Depression[J].ChinaOffshore Oil and Gas(Geology),2000,14(5):320-323.
[11]Gong Y,Wang L,Liu S,et al.Distribution characteristics of terrestrialheat flow density in Jiyang depression of Shengli Oilfield,East China[J].Science in China Series D:Earth Sciences,2004,47(9):804-812.
[12]Ungerer P,Behar F,Villalba M,et al.Kinetic modelling of oilcracking[J].Organic Geochemistry,1988,13:857-868.
[13]Tsuzuki N,Takeda N,Suzuki M,et al.The kinetic modeling ofoil cracking by hydrothermal pyrolysis experiments[J].Interna-tional Journal of Coal Geology,1999,39(1/3):227-250.
[14]Behar F,Lorant F,Mazeas L.Elaboration of a new compositionalkinetic schema for oil cracking[J].Organic Geochemistry,2008,39(6):764-782.
[15]Kuo L C,Eric Michael G.A multicomponent oil-cracking kineticsmodel for modeling preservation and composition of reservoiredoils[J].Organic Geochemistry 1994,21(8/9):911-925.
[16]Vandenbroucke M,Behar F,Rudkiewicz J L.Kinetic modelling ofpetroleum formation and cracking:implications from the highpressure/high temperature Elgin Field(UK,North Sea)[J].Or-ganic Geochemistry,1999,30(9):1105-1125.
[17]Baumgartner M,Bakker R J.CaCl2-hydrate nucleation in syntheticfluid inclusions[J].Chemical Geology,2009,265(3/4):335-344.
[18]平宏伟,陈红汉,宋国奇,等.油气充注成藏贡献度及其意义[J].地球科学——中国地质大学学报,2012,37(1):163-170.Ping Hongwei,Chen Honghan,Song Guoqi,et al.Contributionsdegree of petroleum charging to oil and gas accumulation and itssignificance[J].Earth Science:Journal of China University of Ge-osciences,2012,37(1):163-170.
[19]Thiéry R,Pironon J,Walgenwitz F,et al.Individual characteriza-tion of petroleum fluid inclusions(composition and P-T trappingconditions)by microthermometry and confocal laser scanning mi-croscopy:inferences from applied thermodynamics of oils[J].Ma-rine Petroleum Geology,2002,19(7):847-859.
[20]Prinzhofer A A,Huc A Y.Genetic and post-genetic molecularand isotopic fractionations in natural gases[J].Chemistry Geolo-gy,1995,126(3/4):281-290.
[21]Tian H,Xiao X,Wilkins R W T,et al.Genetic origins of marinegases in the Tazhong area of the Tarim basin,NW China:impli-cations from the pyrolysis of marine kerogens and crude oil[J].International Journal of Coal Geology,2010,82(1/2):17-26.
[22]Guo L,Xiao X,Tian H,et al.Distinguishing gases derived from oilcracking and kerogen maturation:insights from laboratory pyrolysisexperiments[J].Organic Geochemistry,2009,40(10):1074-1084.
[23]Ricchiuto T,Schoell M.Origin of natural gases in the Apulianbasin in south Italy:a case history of mixing of gases of deep andshallow origin[J].Organic Geochemistry,1988,13:311-318.
[24]Jenden P D,Drazan D J,Kaplan I R.Mixing of thermogenic natu-ral gases in Northern Appalachian basin[J].AAPG Bulletin,1993,77:980-998.
[25]罗霞.济阳坳陷不同类型天然气成因机制及气田形成有利条件分析[R].东营:中国石化胜利油田公司,2005.Luo Xia.Origin of different types of natural gas and analysis ofadvantageous conditions of natual gas reservior in Jiyang depres-sion[R].Dongying:Sinopec Shengli Oil field Company,2005.
[26]陈建渝.济阳坳陷裂解气成藏系统研究[R].东营:中国石化胜利油田地质科学院,2005.Chen Jianyu.Research on cracking gas accumulation system inJiyang depression[R].Dongying:Research Institute of GeologicalScience,Sinopec Shengli Oilfield Company,2005.
[27]李延均.济阳坳陷烃类相态演化及深层资源潜力评价[R].东营:中国石化胜利油田地质科学院,2008.Li Yanjun.Phase evolution and resource evaluation of deeply bur-ied reservior in Jiyang depression[R].Dongying:Research Instituteof Geological Science,Sinopec Shengli Oilfield Company,2008.
[28]金强.山东胜利探区深层天然气生成模式研究[R].东营:中国石化胜利油田地质科学院,2008.Jin Qiang.Research on the model of natural gas generation inShengli Oilfield[R].Dongying:Research Institute of GeologicalScience,Sinopec Shengli Oilfield Company,2008.
[29]Xu Y,Shen P.A study of natural gas origins in China[J].AAPGBulletin,1996,80(10):1604-1614.
[30]Chen J,Xu Y,Huang D.Geochemical characteristics and origin ofnatural gas in Tarim Basin,China[J].AAPG Bulletin,2000,84(5):591-606.
[31]Aali J,Rahimpour-Bonab H,Kamali M R.Geochemistry and ori-gin of the world's largest gas field from Persian Gulf,Iran[J].JPetrol.Sci.Eng.,2006,50(3/4):161-175.
[32]Liu Q,Chen M,Liu W,et al.Origin of natural gas from the Or-dovician paleo-weathering crust and gas-filling model in Jingbiangas field,Ordos Basin,China[J].Journal of Asian Earth Sci-ences,2009,35(1/2):74-88.
[33]Zhu W,Huang B,Mi L,et al.Geochemistry,origin,and deep-wa-ter exploration potential of natural gases in the Pearl RiverMouth and Qiongdongnan basins,South China Sea[J].AAPGBulletin,2009,93(6):741-761.
[34]Hantschel T,Kauerauf A I.Fundamentals of basin and petroleumsystems modeling[M].Berlin,Heidelberg:Springer-Verlag,2009.