渤海西部沙垒田凸起区走滑断层演化及其对油气的控制作用
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摘要
渤海海域西部沙垒田凸起区潜山为太古界花岗岩,新近系河流相碎屑岩直接覆盖在基底潜山之上。该区发育长约20km的NE向右旋走滑断层,斜切整个凸起。潜山内发育的NE和NW向两组走滑断层走向夹角约100°,NE向主走滑断层持续活动至今;NW向断层延续较短,局部表现为沟道,新近纪停止活动。该区走滑断层整体表现为负花状构造。新近纪构造运动在主走滑断层附近诱发大量近EW向左旋张扭性小断层并对主走滑断层形成切割。高分辨率三维地震资料精细解释表明,该区断层演化经历了三个阶段,即新近纪前基底断裂走滑阶段、新近纪早期盖层张性断裂弱雁列化阶段、新近纪晚期盖层张扭性断裂强雁列化阶段。凸起区走滑断层的多期活动不仅形成了断背斜圈闭,而且控制了走滑断层两盘古近系的沉积,对油气聚集和重新分配产生影响。
Buried hills in the Shaleitian bulge of the western Bohai offshore are composed of Archaeozoic granite,which is immediately covered by Neogene fluvial clasolites.In this area there is a well-developed NE dextral strike-slip fault that stretches for about 20km and slantingly cuts through the whole Shaleitian bulge.The angle between the NE and NW strike-slip faults within the buried hills is about 100°.The major NE strike-slip fault keeps unceasingly active,while NW faults being no longer active in Neogene extend discontinuously with partial segments displayed as channels.Strike-slip faults in this area commonly show a minus flower structure and the Neogene tectonic movement induced numerous approximately-EW dextral extensional minor faults near the major strike-slip fault,which cut the major strike-slip fault occasionally.Based on detailed interpretations of high-resolution seismic data,we divided the evolution of faults in this area into three stages: the formation of base strike-slip faults in pre-Neogene,the formation of feebly-en-echelon faults in cover strata in early Neogene and the formation of tenso-shear and strongly-en-echelon faults in cover strata in late Neogene.Multiperiodic activities of strike-slip faults in the uplifted area not only formed faulted-anticline traps but also controlled Paleogene deposits on both sides of the faults,exerting an influence on the accumulation and redistribution of hydrocarbons.
Buried hills in the Shaleitian bulge of the western Bohai offshore are composed of Archaeozoic granite,which is immediately covered by Neogene fluvial clasolites.In this area there is a well-developed NE dextral strike-slip fault that stretches for about 20km and slantingly cuts through the whole Shaleitian bulge.The angle between the NE and NW strike-slip faults within the buried hills is about 100°.The major NE strike-slip fault keeps unceasingly active,while NW faults being no longer active in Neogene extend discontinuously with partial segments displayed as channels.Strike-slip faults in this area commonly show a minus flower structure and the Neogene tectonic movement induced numerous approximately-EW dextral extensional minor faults near the major strike-slip fault,which cut the major strike-slip fault occasionally.Based on detailed interpretations of high-resolution seismic data,we divided the evolution of faults in this area into three stages: the formation of base strike-slip faults in pre-Neogene,the formation of feebly-en-echelon faults in cover strata in early Neogene and the formation of tenso-shear and strongly-en-echelon faults in cover strata in late Neogene.Multiperiodic activities of strike-slip faults in the uplifted area not only formed faulted-anticline traps but also controlled Paleogene deposits on both sides of the faults,exerting an influence on the accumulation and redistribution of hydrocarbons.
引文
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[30]Morlay C K,Seutthiya G K.Fault superimposition and linkageresulting from stress changes during rifting:examples from3Dseismic data,Phitsanulok basin,Tailand[J].Journal of StructuralGeology,2007,29:646-663.
[31]Atmaoui N,Kukowski N,Stockhert B,et al.Initiation and devel-opment of pull-apart basins with Riedel shear mechanism:insightfrom scaled clay experiments[J].International Journal of EarthSciences,2006,95(2):225-238.
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[2]徐杰,牛嘉玉,吕悦军,等.营口—潍坊断裂带的新构造和新构造活动[J].石油学报,2009,30(4):498-505.Xu Jie,Niu Jiayu,LüYuejun,et al.Neotectonics and neotectonicactivities of Yingkou-Weifang fault zone[J].Acta Petrolei Sini-ca,2009,30(4):498-505.
[3]万桂梅,汤良杰,周心怀,等.郯庐断裂带在渤海海域渤东地区的构造特征[J].石油学报,2009,30(3):342-346.Wan Guimei,Tang Liangjie,Zhou Xinhuai,et al.Tectonic charac-teristics of the Tanlu fault zone in Bodong area of Bohai Sea[J].Acta Petrolei Sinica,2009,30(3):342-346.
[4]龚再升,蔡东升,张功成.郯庐断裂对渤海海域东部油气成藏的控制作用[J].石油学报,2007,28(4):1-10.Gong Zaisheng,Cai Dongsheng,Zhang Gongcheng.Dominatingaction of Tanlu Fault on hydrocarbon accumulation in easternBohai Sea area[J].Acta Petrolei Sinica,2007,28(4):1-10.
[5]杨明慧.渤海湾盆地变换构造特征及其成藏意义[J].石油学报,2009,30(6):816-823.Yang Minghui.Transfer structure and its relation to hydrocarbonexploration in Bohai Bay Basin[J].Acta Petrolei Sinica,2009,30(6):816-823.
[6]万桂梅,汤良杰,周心怀,等.渤海海域新近纪—第四纪断裂特征及形成机制[J].石油学报,2010,31(4):591-595.Wan Guimei,Tang Liangjie,Zhou Xinhuai,et al.Neogene-Qua-ternary fault characteristics and its formation mechanism in Bo-hai Sea[J].Acta Petrolei Sinica,2010,31(4):591-595.
[7]陈书平,吕丁友,王应斌,等.渤海盆地新近纪—第四纪走滑作用及油气勘探意义[J].石油学报,2010,31(6):894-899.Chen Shuping,LüDingyou,Wang Yingbin,et al.Neogene Qua-ternary strike-slip movement in Bohai Basin and its significancein petroleum exploration[J].Acta Petrolei Sinica,2010,31(6):894-899.
[8]徐杰,周本刚,计凤桔,等.渤海地区新构造格局[J].石油学报,2011,32(3):442-449.Xu Jie,Zhou Bengang,Ji Fengju,et al.A primary study on theneotectonic pattern of the Bohai area in China[J].Acta PetroleiSinica,2011,32(3):442-449.
[9]朱伟林,王国纯,周毅.渤海油气资源浅析[J].石油学报,2000,21(3):1-7.Zhu Weilin,Wang Guochun,Zhou Yi.Potential of petroleum re-sources in the offshore of Bohai Bay Basin[J].Acta Petrolei Sini-ca,2000,21(3):1-7.
[10]董月霞,汪泽成,郑红菊,等.走滑断层作用对南堡凹陷油气成藏的控制[J].石油勘探与开发,2008,35(4):424-430.Dong Yuexia,Wang Zecheng,Zheng Hongju,et al.Control ofstrike-slip faulting on reservoir formation of oil and gas in Nanpusag[J].Petroleum Exploration and Development,2008,35(4):424-430.
[11]Sylvester A G.Strike-slip faults[J].Geological Society of AmericaBulletin,1988,100(11):1666-1703.
[12]Swanson M T.Late Paleozoic strike-slip faults and related veinarrays of Cape Elizabeth,Maine[J].Journal of Structural Geolo-gy,2006,28:456-473.
[13]Ghosh N,Chattopadhyay A.The initiation and linkage of surfacefractures above a buried strike-slip fault:an experimental ap-proach[J].Journal of Earth Systern.Science,2008,117(1):23-32.
[14]王义强,孙丰月,吕古贤.韧性剪切带向剪破裂的转化与成岩成矿作用[J].地质力学学报,1997,3(1):38-44.Wang Yiqiang,Sun Fengyue,LüGuxian.Transformation fromductile shear zones to shear fracture and related litho-metallogen-esis[J].Journal of Geomechanics,1997,3(1):38-44.
[15]Naylor M A,Mandl G,Sijpesteijn C H K.Fault geometries inbasement-induced wrench faulting under different initial stressstates[J].Journal of Structural Geology,1986,8:737-752.
[16]Cembrano J,Gonzalez G,Arancibia G,et al.Fault zone develop-ment and strain partitioning in an extensional strike-slip duplex:a case study from the Mesozoic Atacama fault system,NorthernChile[J].Tectonophysics,2005,400:105-125.
[17]Davis G H.“Riedel relays”in deformation band shear zones,Col-orado Plateau,Utah[J].Geological Society of America Abstractswith Programs,1996,28:A-188.
[18]Pachell M A,Evans J P.Growth,linkage and termination proces-ses of a 10-km-long strike-slip fault in jointed granite:the GeminiFault zone Sierra Nevada,California[J].Journal of Structural Ge-ology,2002,24:1903-1924.
[19]Flodin E A,Aydin A.Evolution of a strike-slip fault network,Valley of Fire State Park,southern Nevada[J].Geological Socie-ty of America Bulletin,2004,116:42-59.
[20]Willemse E J M,Peacock D C P,Aydin A.Nucleation and growthof strike-slip faults in limestones from Somerset,UK[J].Journalof Structural Geology,1997,19:1461-1477.
[21]Kelly P J,Sanderson D J,Peacock D C P.Linkage and evolutionof conjugate strike-slip fault zones in limestones of Somersetand Northumbria[J].Journal of Structural Geology,1998,20:1477-1493.
[22]Cox S J D,Scholz C H.On the formation and growth of faults:anexperimental study[J].Journal of Structural Geology,1988,10:413-430.
[23]Faulkner D R,Jacskon C L,Lunn,et al.A review of recent devel-opments concerning the structure,mechanics and fluid flow prop-erties of fault zones[J].Journal of Structural Geology,2010,32(11):1557-1575.
[24]Moody J D,Hill M J.Wrench-fault tectonics[J].Geological Soci-ety of America Bulletin,1956,67:1207-1246.
[25]单家增,张占文,肖乾华.辽河坳陷古近纪两期构造演化的构造物理模拟实验[J].石油勘探与开发,2004,31(3):14-17.Shan Jiazeng,Zhang Zhanwen,Xiao Qianhua.Modeling experi-ments of two-phase structural evolution in the Liaohe Depres-sion,Paleogene[J].Petroleum Exploration and Development,2004,31(3):14-17.
[26]童亨茂,宓荣三,于天才,等.渤海湾盆地辽河西部凹陷的走滑构造作用[J].地质学报,2008,82(8):1017-1026.Dong Hengmao,Mi Rongsan,Yu Tiancai,et al.The strike-sliptectonics in the Western Liaohe Depression,Bohai Bay Basin[J].Acta Geologica Sinica,2008,82(8):1017-1026.
[27]曹忠祥.营口—潍坊断裂带新生代走滑拉分—裂陷盆地伸展量、沉降量估算[J].地质科学,2008,43(1):65-81.Cao Zhongxiang.Calculation of extension and subsidence of theCenozoic pull-apart and rift basins along the Yingkou-Weifangfault zone[J].Chinese Journal of Geology,2008,43(1):65-81.
[28]Morlay C K.How successful are analogue models in addressingthe influence of pre-existing fabrics on rift structure[J].Journalof Structural Geology,1999,21:1267-1274.
[29]Morley C K.Variations in late Cenozoic-recent strike-slip and ob-lique-extensional geometries within Indochina:the influence ofpre-existing fabrics[J].Journal of Structural Geology,2004,26:1803-1829.
[30]Morlay C K,Seutthiya G K.Fault superimposition and linkageresulting from stress changes during rifting:examples from3Dseismic data,Phitsanulok basin,Tailand[J].Journal of StructuralGeology,2007,29:646-663.
[31]Atmaoui N,Kukowski N,Stockhert B,et al.Initiation and devel-opment of pull-apart basins with Riedel shear mechanism:insightfrom scaled clay experiments[J].International Journal of EarthSciences,2006,95(2):225-238.
[32]彭文绪,史浩,孙和风,等.郯庐走滑断层右旋走滑的地震切片证据[J].石油地球物理勘探,2009,44(6):755-759.Peng Wenxu,Shi Hao,Sun Hefeng,et al.Dextral strike-slip evi-dence on seismic slice for Tanlu strike-slip fault[J].Oil Geophys-ical Prospecting,2009,44(6):755-759.
[33]朱光,刘国生,牛漫兰,等.郯庐断裂带的平移运动与成因[J].地质通报,2003,22(3):200-207.Zhu Guang,Liu Guosheng,Niu Manlan,et al.Transcurrentmovement and genesis of the Tan-Lu fault zone[J].GeologicalBulletin of China,2003,22(3):200-207.
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