金湖凹陷石港断层构造演化及油气聚集特征
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摘要
石港断层位于金湖凹陷中部,是凹陷内的主要断裂带,具有复杂的结构及演化过程。通过三维地震资料解释及断层的定量解析,分析了石港断层带在晚白垩世—新生代时期的几何学及运动学特征,并讨论了断层伸展与走滑性质的转变及其分段特征。研究表明:自晚白垩世—新生代石港断层经历了凹陷内次级正断层、控制次凹的边界正断层到右旋走滑正断层的演化过程;平面上石港断层具有明显的分段特征,由北向南断层性质发生走滑—扭张—张扭—正断层的转变;断层的分段特征受基底先存断层的影响,断层性质的转化则反映了区域应力场方向的改变。在伸展与走滑作用的共同影响下,石港断裂带内聚集了丰富的油气。
Shigang Fault is located within the centre of Jinhu Sag,which is the major fault zone of this sag with complex structure and evolution process.Based on the 3D seismic data and quantitative analysis,the characteristics of geometry and kinematics of Shigang Fault was analyzed during the late Cretaceous-Cenozoic period,meanwhile the property transferred from extension to strike-slip of the fault and its segmentation character were also discussed.In the late Cretaceous-Cenozoic,Shigang Fault has experienced three processes,including the secondary normal fault stage,boundary normal fault stage and right-lateral strike-slip normal fault stage.On the plane,Shigang Fault has obvious segmentation character,from north to south,the fault property varieties from strike-slip feature to shear-tensional feature,from tensional-shear feature to normal fault feature.It shows a strike-slip component in the northern part,normal fault in the southern part.The differential deformation is controlled by the pre-existing fault in basement,which reveals the change of the extension direction.The extension and strike-slip resulted in the abundant hydrocarbon accumulation in Shigang Fault Zone.
Shigang Fault is located within the centre of Jinhu Sag,which is the major fault zone of this sag with complex structure and evolution process.Based on the 3D seismic data and quantitative analysis,the characteristics of geometry and kinematics of Shigang Fault was analyzed during the late Cretaceous-Cenozoic period,meanwhile the property transferred from extension to strike-slip of the fault and its segmentation character were also discussed.In the late Cretaceous-Cenozoic,Shigang Fault has experienced three processes,including the secondary normal fault stage,boundary normal fault stage and right-lateral strike-slip normal fault stage.On the plane,Shigang Fault has obvious segmentation character,from north to south,the fault property varieties from strike-slip feature to shear-tensional feature,from tensional-shear feature to normal fault feature.It shows a strike-slip component in the northern part,normal fault in the southern part.The differential deformation is controlled by the pre-existing fault in basement,which reveals the change of the extension direction.The extension and strike-slip resulted in the abundant hydrocarbon accumulation in Shigang Fault Zone.
引文
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[2]漆家福.渤海湾新生代盆地的两种构造系统及其成因解释[J].中国地质,2004,31(1):15-22.Qi Jiafu.Two tectonic systems in the Cenozoic Bohai Bay basinand their genetic interpretation[J].Chinese Geology,2004,31(1):15-22.
[3]李家康.渤海油气成藏特点及与断层关系[J].石油学报,2001,22(2):26-31.Li Jiakang.The relationship between the characteristic of hydro-carbon and the fault and hydrocarbon exploration in Bohai[J].Acta Petrolei Sinica,2001,22(2):26-31.
[4]孙永河,漆家福,吕延防,等.渤中坳陷断裂构造特征及其对油气的控制[J].石油学报,2008,29(5):669-675.Sun Yonghe,Qi Jiafu,LüYanfang,et al.Characteristics of faultstructure and its control to hydrocarbon in Bozhong Depression[J].Acta Petrolei Sinica,2008,29(5):669-675.
[5]刘玉瑞,刘启东,杨小兰.苏北盆地走滑断层特征与油气聚集关系[J].石油与天然气地质,2004,25(3):279-283.Liu Yurui,Liu Qidong,Yang Xiaolan.Relation between featuresof strike-slip faults and hydrocarbon accumulation in Subei Basin[J].Oil&Gas Geology,2004,25(3):279-283.
[6]邱旭明.扭动作用在苏北盆地构造体系中的表现及其意义[J].江汉石油学院学报,2002,24(2):5-7.Qiu Xuming.Representation of torsional action in tectonic sys-tem of Subei Basin and its significance[J].Journal of JianghanPetroleum Institute,2002,24(2):5-7.
[7]池英柳,赵文智.渤海湾盆地新生代走滑构造与油气聚集[J].石油学报,2000,21(2):14-20.Chi Yingliu,Zhao Wenzhi.Strike-slip deformation during the Ce-nozoic and its influence on hydrocarbon accumulation in the Bo-hai Bay Basin[J].Acta Petrolei Sinica,2000,21(2):14-20.
[8]蔡东升,罗毓晖,姚长华.渤海莱州湾走滑拉分凹陷的构造研究及其石油勘探意义[J].石油学报,2001,22(2):19-25.Cai Dongsheng,Luo Yuhui,Yao Zhanghua.Strike-slip and pull-apart structure study and its significance to petroleum explora-tion on Laizhouwan Sag,Bohai Area[J].Acta Petrolei Sinica,2001,22(2):19-25.
[9]Hsiao L Y,Graham S A,Tilander N.Seismic reflection imagingof a major strike-slip fault zone in a rift system:Paleogene struc-ture and evolution of the Tan-Lu fault system,Liaodong Bay,Bo-hai,offshore China[J].AAPG Bulletin,2004,88(1):71-97.
[10]陈安定.苏北箕状断陷形成的动力学机制[J].高校地质学报,2001,7(4):408-418.Chen Anding.Dynamic mechanism of formation of dustpan sub-sidence,Northern Jiangsu[J].Geological Journal of China Uni-versities,2001,7(4):408-418.
[11]舒良树,王博,王良书,等.苏北盆地晚白垩世—新近纪原型盆地分析[J].高校地质学报,2005,11(4):434-443.Shu Liangshu,Wang Bo,Wang Liangshu,et al.Analysis ofNorthern Jiangsu prototype basin from Late Cretaceous to Neo-gene[J].Geological Journal of China Universities,2005,11(4):434-443.
[12]徐旭辉,高长林,黄泽光,等.中国盆地形成的三大活动构造历史阶段[J].石油与天然气地质,2005,26(2):155-162.Xu Xuhui,Gao Changlin,Huang Zeguang,et al.Three stages oftectonic movements in formation of petroliferous basins in China[J].Oil&Gas Geology,2005,26(2):155-162.
[13]Sylvester A G.Strike-slip faults[J].Geological Society of Ameri-ca Bulletin,1988,100(11):1666-1703.
[14]Uwe Ring,Christian Betzler,Damian Delvaux.Normal vs.strike-slip faulting during rift development in East Africa:The MalawiRift[J].Geology,1992,20(11):1015-1018.
[15]Hudson M R.Coordinated strike-slip and normal faulting in thesouthern Ozark dome of northern Arkansas:Deformation in alate Paleozoic forlend[J].Geology,2000,28(6):511-514.
[16]Bellahsen N,Daniel J M.Fault reactivation control on normalfault growth:An experimental study[J].Journal of StructuralGeology,2005,27(4):769-780.
[17]邱旭明,严元锋,唐焰.苏北盆地卞闵杨油田的发现及其意义[J].石油与天然气地质,2007,28(5):615-620.Qiu Xuming,Yan Yuanfeng,Tang Yan.Discovery of BMY oil-field in the Subei Basin and its significance[J].Oil&Gas Geolo-gy,2007,28(5):615-620.
[18]邱旭明.苏北盆地扭动构造油气藏[J].石油勘探与开发,2004,31(3):26-29.Qiu Xuming.Strike-sliding structure traps in the Subei Basin[J].Petroleum Exploration and Development,2004,31(3):26-29.
[19]Harding T P.Petroleum traps associated with wrench faults[J].AAPG Bulletin,1974,58(7):1290-1304.
[20]Harding T P.Seismic characteristics and identification of nega-tive flower structures,positive flower structures and positivestructural inversion[J].AAPG Bulletin,1985,69(4):582-600.
[21]赵文智,池英柳.渤海湾盆地含油气层系区域分布规律与主控因素[J].石油学报,2000,21(1):10-15.Zhao Wenzhi,Chi Yingliu.Regional distribution regularity andits controlling factors of oil and gas bearing series in Bohai BayBasin[J].Acta Petrolei Sinica,2000,21(1):10-15.
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