万安盆地新生代层序地层格架与岩性地层圈闭
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摘要
利用地震、钻井及古生物等方面的资料进行综合研究,根据沉积层序边界特征和沉积旋回的组合关系,将万安盆地新生代地层划分为3个超层序、6个层序组和10个三级层序;进而分析万安盆地新生代沉积演化过程,认为万安盆地从古新世-始新世开始沉降,直至第四纪总体表现为逐渐海侵的过程,SSQ1和SSQ2层序组以陆相断陷湖盆沉积为主,SSQ3、SSQ4、SSQ5和SSQ6层序组为海陆过渡相和海相沉积;最后通过井震对比分析对典型剖面的岩相及沉积相进行解译,识别并预测了多种岩性地层圈闭,包括低位域中的盆底扇、浊积扇、塌积扇,海侵域中的上倾尖灭砂体以及高位域中的三角洲砂体和生物礁滩等岩性地层圈闭.
Wan'an basin,as a typical Cenozoic transtensional basin,is one of the most important petroliferous basins in the southwestern of South China Sea.In this study,using seismic,drilling and some palaeontologic data,the Cenozoic sequence stratum pattern in Wan'an basin is established,which is subdivided into three super-sequences,six secondary sequences and ten tertiary sequences.In this sequence,the depositional process of Cenozoic strata in Wan'an basin is interpreted as gradually transgression based on comparative study of seismic and drilling data.SSQ1 and SSQ2 sequences are predominantly composed of lacustrine deposits during syn-rift.And SSQ3,SSQ4,SSQ5 as well as SSQ6 sequences are characterized by transitional facies and marine deposit.According to the interpretation of the lithofacies and sedimentary facies from typical seismic profiles,several kinds of lithostratigraphic traps are recognized and predicted,including basin floor fan,turbidite fan and colluvial mass in low-stand system tracts;upward wedge-out sands in transgressive system tracts;and delta sands and biohermal suite in high-stand system tracts.
Wan'an basin,as a typical Cenozoic transtensional basin,is one of the most important petroliferous basins in the southwestern of South China Sea.In this study,using seismic,drilling and some palaeontologic data,the Cenozoic sequence stratum pattern in Wan'an basin is established,which is subdivided into three super-sequences,six secondary sequences and ten tertiary sequences.In this sequence,the depositional process of Cenozoic strata in Wan'an basin is interpreted as gradually transgression based on comparative study of seismic and drilling data.SSQ1 and SSQ2 sequences are predominantly composed of lacustrine deposits during syn-rift.And SSQ3,SSQ4,SSQ5 as well as SSQ6 sequences are characterized by transitional facies and marine deposit.According to the interpretation of the lithofacies and sedimentary facies from typical seismic profiles,several kinds of lithostratigraphic traps are recognized and predicted,including basin floor fan,turbidite fan and colluvial mass in low-stand system tracts;upward wedge-out sands in transgressive system tracts;and delta sands and biohermal suite in high-stand system tracts.
引文
He,Q.,Tong,Z.G.,Hu,G.C.,2005.Sediment filling andits effect on hydrocarbon accumulation in Wanan basin.China Offshore Oil and Gas,17(2):80-83,88(in Chinese with English abstract).
Hu,X.Q.,Yang,M.Z.,2006.Analysis of accommodationchanges in the Wanan basin.Marine Geology Letters,22(6):29-32(in Chinese with English abstract).
Jin,Q.H.,Li,T.G.,2000.Regional geologic tectonics of theNansha Sea area.Marine geology&Quaternary Geology,20(1):1-8(in Chinese with English abstract).
Jin,Q.H.,Liu,Z.H.,Chen,Q.,2004.The central depression of the Wanan basin,South China Sea:agiantabundant hydrocarbon-generating depression.Earth science—Journal of China University of Geosciences,29(5):525-530(in Chinese with English abstract).
Jin,Q.H.,Wu,J.M.,Xie,Q.Y.,et al.,2001.Sedimentarybasin analysis and oil-gas resource in west part of SouthChina Sea.China University of Geosciences Press,Wuhan(in Chinese).
Liu,B.M.,1999.Trap types and their genesis analyses ofWanan basin in South China Sea.ExperimentalPetroleumGeology,21(4):302-306(in Chinese with English abstract).
Liu,B.M.,Xia,B.,Li,X.X.,et al.,2006.Southeastern extension of the Red River fault zone(RRFZ)and its tectonic evolution significance in western South China Sea.Science in China(Ser.D),49(8):57-68.
Liu,B.M.,Xia,B.,Liu,Z.H.,et al.,2002.Analysis on theenrichment and accumulation types of hydrocarbon inthe southwestern sea area of the South China Sea.Experimental Petroleum Geology,24(4):322-333(inChinese with English abstract).
Liu,B.T.,Chen,C.S.,2002.Analysis on the Cenozoic petroleum system in the Wanan basin,Nansha area.Experimental Petroleum Geology,24(2):110-114(inChinese with English abstract).
Liu,H.L.,1999.On an extension-contraction-type dextralstrike-slip duplex system in western Nansha waters,South China Sea and its dynamic process.Marine Geology&Quaternary Geology,19(3):11-17(in Chinesewith English abstract).
Liu,Z.H.,2000.Characteristics of petroleum charge systemin Wanan basin,South China Sea.China Offshore Oiland Gas(Geology),14(5):339-344(in Chinese withEnglish abstract).
Liu,Z.H.,2005.Distribution of sedimentary basins and petroleum potential in southern South China Sea.Geotectonica et Metallogenia,29(3):410-417(in Chinesewith English abstract).
Tong,Z.G.,Hu,G.C.,He,Q.,2005.The tectonic subsidence and heat flow of the western Nansha area.Geotectonica et Metallogenia,29(3):371-376(in Chinesewith English abstract).
Yang,M.Z.,Wang,M.J.,Liang,J.Q.,et al.,2003.Tectonic subsidence and its control on hydrocarbon resourcesin the Wanan basin in the South China Sea.Marine Geology&Quaternary Geology,23(2):85-88(in Chinese with English abstract).
Yang,M.Z.,Wu,J.M.,Yang,R.,et al.,1996.Stratigraphicdivision and nomenclature of the southwestern NanshaSea area.In:Yao,B.C.,et al.,eds.,Geological research of South China Sea(Memoir8).China University of Geosciences Press,Wuhan,37-47(in Chinesewith English abstract).
Yao,B.C.,Liu,Z.H.,2006.Sedimentary basins and petroleum resources in Nansha offshore area,South China Sea.China Offshore Oil and Gas,18(3):150-160(in Chinese with English abstract).
Yao,B.C.,Wan,L.,Liu,Z.H.,et al.,2004.Tectonic significance and its petroleum effect of the Wanan tectonicmovement in the south of the South China Sea.MarineGeology&Quaternary Geology,24(1):69-77(inChinese with English abstract).
Zhang,G.X.,Yang,M.Z.,1999.Tectonic styles and traps of Wan an basin in South China Sea.Tropic Oceanology,18(1):1-6(in Chinese with English abstract).
贺清,仝志刚,胡根成,2005.万安盆地沉积物充填演化及其对油气藏形成的作用.中国海上油气,17(2):80-83,88.
胡小强,杨木壮,2006.万安盆地可容纳空间变化分析.海洋地质动态,22(6):29-32.
金庆焕,李唐根,2000.南沙海域区域地质构造.海洋地质与第四纪地质,20(1):1-8.
金庆焕,刘振湖,陈强,2004.万安盆地中部坳陷——一个巨大的富生烃凹陷.地球科学——中国地质大学学报,29(5):525-530.
金庆焕,吴进民,谢秋元,等,2001.南沙西部海域沉积盆地分析与油气资源.武汉:中国地质大学出版社.
刘宝明,1999.南海西南部含油气区圈闭类型与成因分析.石油实验地质,21(4):302-306.
刘宝明,夏斌,李绪宣,等,2006.红河断裂带东南的延伸及其构造演化意义.中国科学D辑(地球科学),36(10):914-924.
刘宝明,夏斌,刘振湖,等,2002.南海西南部海区油气富集成藏类型分析.石油实验地质,24(4):322-333.
刘伯土,陈长胜,2002.南沙海域万安盆地新生界含油气系统分析.石油实验地质,24(2):110-114.
刘海龄,1999.南沙西部海域伸缩型右旋走滑双重构造系统及其动力学过程.海洋地质与第四纪地质,19(3):11-17.
刘振湖,2000.南海万安盆地油气充载系统特征.中国海上油气(地质),14(5):339-344.
刘振湖,2005.南海南沙海域沉积盆地与油气分布.大地构造与成矿学,29(3):410-417.
仝志刚,胡根成,贺清,2005.南沙西部海区构造沉降与古热流.大地构造与成矿学,29(3):371-376.
杨木壮,王明君,梁金强,等,2003.南海万安盆地构造沉降及其油气成藏控制作用.海洋地质与第四纪地质,23(2):85-88.
杨木壮,吴进民,杨锐,等,1996.南沙海域西南部地层划分及命名.见:姚伯初,等编,南海地质研究(八).武汉:中国地质大学出版社,37-47.
姚伯初,刘振湖,2006.南沙海域沉积盆地及油气资源分布.中国海上油气,18(3):150-160.
姚伯初,万玲,刘振湖,等,2004.南海南部海域新生代万安运动的构造意义及其油气资源效应.海洋地质与第四纪地质,24(1):69-77.
张光学,杨木壮,1999.南海万安盆地的构造样式与构造圈闭.热带海洋,18(1):1-6.
Hu,X.Q.,Yang,M.Z.,2006.Analysis of accommodationchanges in the Wanan basin.Marine Geology Letters,22(6):29-32(in Chinese with English abstract).
Jin,Q.H.,Li,T.G.,2000.Regional geologic tectonics of theNansha Sea area.Marine geology&Quaternary Geology,20(1):1-8(in Chinese with English abstract).
Jin,Q.H.,Liu,Z.H.,Chen,Q.,2004.The central depression of the Wanan basin,South China Sea:agiantabundant hydrocarbon-generating depression.Earth science—Journal of China University of Geosciences,29(5):525-530(in Chinese with English abstract).
Jin,Q.H.,Wu,J.M.,Xie,Q.Y.,et al.,2001.Sedimentarybasin analysis and oil-gas resource in west part of SouthChina Sea.China University of Geosciences Press,Wuhan(in Chinese).
Liu,B.M.,1999.Trap types and their genesis analyses ofWanan basin in South China Sea.ExperimentalPetroleumGeology,21(4):302-306(in Chinese with English abstract).
Liu,B.M.,Xia,B.,Li,X.X.,et al.,2006.Southeastern extension of the Red River fault zone(RRFZ)and its tectonic evolution significance in western South China Sea.Science in China(Ser.D),49(8):57-68.
Liu,B.M.,Xia,B.,Liu,Z.H.,et al.,2002.Analysis on theenrichment and accumulation types of hydrocarbon inthe southwestern sea area of the South China Sea.Experimental Petroleum Geology,24(4):322-333(inChinese with English abstract).
Liu,B.T.,Chen,C.S.,2002.Analysis on the Cenozoic petroleum system in the Wanan basin,Nansha area.Experimental Petroleum Geology,24(2):110-114(inChinese with English abstract).
Liu,H.L.,1999.On an extension-contraction-type dextralstrike-slip duplex system in western Nansha waters,South China Sea and its dynamic process.Marine Geology&Quaternary Geology,19(3):11-17(in Chinesewith English abstract).
Liu,Z.H.,2000.Characteristics of petroleum charge systemin Wanan basin,South China Sea.China Offshore Oiland Gas(Geology),14(5):339-344(in Chinese withEnglish abstract).
Liu,Z.H.,2005.Distribution of sedimentary basins and petroleum potential in southern South China Sea.Geotectonica et Metallogenia,29(3):410-417(in Chinesewith English abstract).
Tong,Z.G.,Hu,G.C.,He,Q.,2005.The tectonic subsidence and heat flow of the western Nansha area.Geotectonica et Metallogenia,29(3):371-376(in Chinesewith English abstract).
Yang,M.Z.,Wang,M.J.,Liang,J.Q.,et al.,2003.Tectonic subsidence and its control on hydrocarbon resourcesin the Wanan basin in the South China Sea.Marine Geology&Quaternary Geology,23(2):85-88(in Chinese with English abstract).
Yang,M.Z.,Wu,J.M.,Yang,R.,et al.,1996.Stratigraphicdivision and nomenclature of the southwestern NanshaSea area.In:Yao,B.C.,et al.,eds.,Geological research of South China Sea(Memoir8).China University of Geosciences Press,Wuhan,37-47(in Chinesewith English abstract).
Yao,B.C.,Liu,Z.H.,2006.Sedimentary basins and petroleum resources in Nansha offshore area,South China Sea.China Offshore Oil and Gas,18(3):150-160(in Chinese with English abstract).
Yao,B.C.,Wan,L.,Liu,Z.H.,et al.,2004.Tectonic significance and its petroleum effect of the Wanan tectonicmovement in the south of the South China Sea.MarineGeology&Quaternary Geology,24(1):69-77(inChinese with English abstract).
Zhang,G.X.,Yang,M.Z.,1999.Tectonic styles and traps of Wan an basin in South China Sea.Tropic Oceanology,18(1):1-6(in Chinese with English abstract).
贺清,仝志刚,胡根成,2005.万安盆地沉积物充填演化及其对油气藏形成的作用.中国海上油气,17(2):80-83,88.
胡小强,杨木壮,2006.万安盆地可容纳空间变化分析.海洋地质动态,22(6):29-32.
金庆焕,李唐根,2000.南沙海域区域地质构造.海洋地质与第四纪地质,20(1):1-8.
金庆焕,刘振湖,陈强,2004.万安盆地中部坳陷——一个巨大的富生烃凹陷.地球科学——中国地质大学学报,29(5):525-530.
金庆焕,吴进民,谢秋元,等,2001.南沙西部海域沉积盆地分析与油气资源.武汉:中国地质大学出版社.
刘宝明,1999.南海西南部含油气区圈闭类型与成因分析.石油实验地质,21(4):302-306.
刘宝明,夏斌,李绪宣,等,2006.红河断裂带东南的延伸及其构造演化意义.中国科学D辑(地球科学),36(10):914-924.
刘宝明,夏斌,刘振湖,等,2002.南海西南部海区油气富集成藏类型分析.石油实验地质,24(4):322-333.
刘伯土,陈长胜,2002.南沙海域万安盆地新生界含油气系统分析.石油实验地质,24(2):110-114.
刘海龄,1999.南沙西部海域伸缩型右旋走滑双重构造系统及其动力学过程.海洋地质与第四纪地质,19(3):11-17.
刘振湖,2000.南海万安盆地油气充载系统特征.中国海上油气(地质),14(5):339-344.
刘振湖,2005.南海南沙海域沉积盆地与油气分布.大地构造与成矿学,29(3):410-417.
仝志刚,胡根成,贺清,2005.南沙西部海区构造沉降与古热流.大地构造与成矿学,29(3):371-376.
杨木壮,王明君,梁金强,等,2003.南海万安盆地构造沉降及其油气成藏控制作用.海洋地质与第四纪地质,23(2):85-88.
杨木壮,吴进民,杨锐,等,1996.南沙海域西南部地层划分及命名.见:姚伯初,等编,南海地质研究(八).武汉:中国地质大学出版社,37-47.
姚伯初,刘振湖,2006.南沙海域沉积盆地及油气资源分布.中国海上油气,18(3):150-160.
姚伯初,万玲,刘振湖,等,2004.南海南部海域新生代万安运动的构造意义及其油气资源效应.海洋地质与第四纪地质,24(1):69-77.
张光学,杨木壮,1999.南海万安盆地的构造样式与构造圈闭.热带海洋,18(1):1-6.
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