北部湾盆地福山凹陷构造转换带及其油气富集规律
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摘要
基于典型三维地震解释结果,结合东西部构造差异特征,在福山凹陷中部识别出一个构造转换带,该构造转换带主要发育于古近纪流沙港组沉积时期,位于东西部接壤部位花场低凸起之上,转换带两侧分属为2个伸展构造体系,断层的走向和构造样式具有较大的差异性。花状构造的发育表明存在区域走滑作用,与转换带的成因密切相关。构造转换带为物源入口,控制着砂体和沉积体系的运移方向和展布范围;深层反向断裂有利于油气的疏导和封存;复杂的断裂体系有利于断鼻和断块圈闭形成,同时有利于改善储层物性。构造转换带具有双向油源条件,发育独特的油气成藏模式和多种油气藏类型,由此可见该转换带对油气成藏具有良好的控制作用,具有良好的油气勘探前景。
The Fushan Sag is a secondary tectonic unit in the southeastern coast of the Beibuwan Basin which is located in the northwestern of the South China Sea.Based on the interpretation of the 3D seismic data and the contrast of tectonic characteristics between the western and eastern area,a transfer zone is found in the centre of the sag.The transfer zone was mainly developed in the Palaeogene Liushagang Formation and located above the Huachang low uplift at the intersection of the western and eastern areas.Two extensional structure systems were developed respectively at two lateral sides of the transfer zone.There were significant differences on the strike of faults and structure styles between the two systems.The formation of the transfer zone was caused by the existence of strike-slip process with the development of flower structure.The transfer zone is the entrance of source and controls the distribution of sand and deposition system through the counseling function of regulation faults.The deep antithetic fault system is favorable to form various kinds of traps and control the most petroleum accumulation distribution.The complex structure system contributes to the formation of the fault block reservoir and fault-nose pool and improves the quality of sandstone reservoir.The transfer zone holds distinct hydrocarbon accumulation with two oil resources and various types of reservoir.In all,the transfer zone has a good control effect on hydrocarbon accumulation and has good prospects for hydrocarbon exploration.
The Fushan Sag is a secondary tectonic unit in the southeastern coast of the Beibuwan Basin which is located in the northwestern of the South China Sea.Based on the interpretation of the 3D seismic data and the contrast of tectonic characteristics between the western and eastern area,a transfer zone is found in the centre of the sag.The transfer zone was mainly developed in the Palaeogene Liushagang Formation and located above the Huachang low uplift at the intersection of the western and eastern areas.Two extensional structure systems were developed respectively at two lateral sides of the transfer zone.There were significant differences on the strike of faults and structure styles between the two systems.The formation of the transfer zone was caused by the existence of strike-slip process with the development of flower structure.The transfer zone is the entrance of source and controls the distribution of sand and deposition system through the counseling function of regulation faults.The deep antithetic fault system is favorable to form various kinds of traps and control the most petroleum accumulation distribution.The complex structure system contributes to the formation of the fault block reservoir and fault-nose pool and improves the quality of sandstone reservoir.The transfer zone holds distinct hydrocarbon accumulation with two oil resources and various types of reservoir.In all,the transfer zone has a good control effect on hydrocarbon accumulation and has good prospects for hydrocarbon exploration.
引文
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[16]石彦民,刘菊,张梅珠,等.海南福山凹陷油气勘探实践与认识[J].华南地震,2007,27(3):57-68.SHI Yan-min,LIU Ju,ZHANG Mei-zhu,et al.Experience andunderstand in oil and gas exploration in Fushan Sag,HainanProvince[J].South China Journal of Seismology,2007,27(3):57-68.
[17]罗群,庞雄奇.海南福山凹陷顺向和反向断裂控藏机理及油气聚集模式[J].石油学报,2008,29(3):363-367.LUO Qun,PANG Xiong-qi.Reservoir controlling mechanismand petroleum accumulation model for consequent fault andantithetic fault in Fushan Sag of Hainan area[J].Acta PetroleiSinica,2008,29(3):363-367.
[18]刘晓峰,董月霞,王华.渤海湾盆地南堡凹陷的背形负花状构造[J].地球科学—中国地质大学学报,2010,35(6):1029-1034.LIU Xiao-feng,DONG Yue-xia,WANG Hua.Antiformalnegative flower structure in nanpu sag,bohai bay basin[J].EarthScience—Journal of China University of Geosciences,2010,35(6):1029-1034.
[19]李美俊,王铁冠,刘菊,等.北部湾盆地福山凹陷天然气成因与来源[J].天然气地球科学,2007,18(2):260-265.LI Mei-jun,WANG Tie-guan,LIU Ju,et al.Genesis source ofnatural gas in the Fushan Sag,Beibuwan Basin[J].Natural GasGeoscience,2007,18(2):260-265.
[2]Song T,Cawood P A.Structural styles in the Perth Basinassociated with the Mesozoic break-up of Greater India andAustralia[J].Tectonophysics,2000,317:55-72.
[3]Coskun B.Oil and gas fields-transfer zone relationships,Thracebasin,NW Turkey[J].Marine and Petroleum Geology,1997,14(4):401-416.
[4]Kornsawan A,Morley C K.The origin and evolution of complextransfer zones(garden shifts)in conjugate fault systems aroundthe Funan Filed,Pattani Basin,Gulf of Thailand[J].Journal ofStructural Geology,2002,24:435-449.
[5]Elena A K,Lyal B H,Jimmy P,et al.Transfer zones and faultreactivation in inverted rift basins:Insights from physicalmodeling[J].Tectonophysics,2007,441:1-26.
[6]王家豪,王华,任建业,等.黄骅坳陷中区大型斜向转换带及其油气勘探意义[J].石油学报,2010,31(3):355-359.WANG Jia-hao,WANG Hua,REN Jian-ye,et al.A greatoblique transition zone in the central Huanghua Sag and itssignificance for petroleum exploration[J].Acta Petrolei Sinica,2010,31(3):355-359.
[7]Corti G.Centrifuge modelling of the influence of crustal fabricson the development of transfer zones:Insights into themechanics of continental rifting architecture[J].Tectonophysics,2004,384:191-208.
[8]Peacock D C P.The post-Variscan development of the BritishIsles within a regional transfer zone influenced by orogenesis[J].Journal of Structural Geology,2004,26:2225-2231.
[9]Ravagliaa A,Turrinib C,Seno S.Mechanical stratigraphy as afactor controlling the development of a sandbox transfer zone:Athree-dimensional analysis[J].Journal of Structural Geology,2004,26:2269-2283.
[10]Petrinovic I A,Riller U,Brod J A,et al.Bimodal volcanism in atectonic transfer zone:Evidence for tectonically controlledmagmatism in the southern Central Andes,NW Argentina[J].Journal of Volcanology and Geothermal Research,2006,152:240-252.
[11]汪望泉,窦立荣,张志伟,等.苏丹福拉凹陷转换带特征及其与油气的关系[J].石油勘探与开发,2007,34(1):124-127.WANG Wang-quan,DOU Li-rong,ZHANG Zhi-wei,et al.Transfer zone character and its relationship to hydrocarbon inFula Sag,Sudan[J].Petroleum Exploration and Development,2007,34(1):124-127.
[12]梁锋,范军侠,李宏伟,等.大港油田板桥凹陷构造转换带与油气聚集[J].古地理学报,2008,10(1):73-76.LIANG Feng,FAN Jun-xia,LI Hong-wei,et al.Relationshipbetween tectonic transfer zones and petroleum accumulation inBanqiao Sag,Dagang Oilfield[J].Journal of Palaeogeography,2008,10(1):73-76.
[13]张永刚,汤良杰,金文正,等.龙门山构造转换带对油气成藏的控制作用[J].中国石油大学学报:自然科学版,2009,33(5):30-35.ZHANG Yong-gang,TANG Liang-jie,JIN Wen-zheng,et al.Control of transfer zones on hydrocarbon accumulation inLongmen Mountains thrust belt[J].Journal of China Universityof Petroleum:Edition of Natural Science,2009,33(5):30-35.
[14]鲍志东,赵艳军,祁利祺,等.构造转换带储集体发育的主控因素—以准噶尔盆地腹部侏罗系为例[J].岩石学报,2011,27(3):867-877.BAO Zhi-dong,ZHAO Yan-jun,QI Li-qi,et al.Controllingfactors of reservoir development in structural transfer zones:Acase study of the Inner Junggar basin in Jurassic[J].ActaPetrologica Sinica,2011,27(3):867-877.
[15]于俊吉,罗群,张多军,等.北部湾盆地海南福山凹陷断裂特征及其对油气成藏的控制作用[J].石油实验地质,2004,26(3):241-248.YU Jun-ji,LUO Qun,ZHANG Duo-jun,et al.Characteristics offaults in the Fushan Sag of Hainan,the Beibuwan Basin and theircontrolling roles to hydrocarbon pool-formation[J].PetroleumGeology&Experiment,2004,26(3):241-248.
[16]石彦民,刘菊,张梅珠,等.海南福山凹陷油气勘探实践与认识[J].华南地震,2007,27(3):57-68.SHI Yan-min,LIU Ju,ZHANG Mei-zhu,et al.Experience andunderstand in oil and gas exploration in Fushan Sag,HainanProvince[J].South China Journal of Seismology,2007,27(3):57-68.
[17]罗群,庞雄奇.海南福山凹陷顺向和反向断裂控藏机理及油气聚集模式[J].石油学报,2008,29(3):363-367.LUO Qun,PANG Xiong-qi.Reservoir controlling mechanismand petroleum accumulation model for consequent fault andantithetic fault in Fushan Sag of Hainan area[J].Acta PetroleiSinica,2008,29(3):363-367.
[18]刘晓峰,董月霞,王华.渤海湾盆地南堡凹陷的背形负花状构造[J].地球科学—中国地质大学学报,2010,35(6):1029-1034.LIU Xiao-feng,DONG Yue-xia,WANG Hua.Antiformalnegative flower structure in nanpu sag,bohai bay basin[J].EarthScience—Journal of China University of Geosciences,2010,35(6):1029-1034.
[19]李美俊,王铁冠,刘菊,等.北部湾盆地福山凹陷天然气成因与来源[J].天然气地球科学,2007,18(2):260-265.LI Mei-jun,WANG Tie-guan,LIU Ju,et al.Genesis source ofnatural gas in the Fushan Sag,Beibuwan Basin[J].Natural GasGeoscience,2007,18(2):260-265.
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