珠江口盆地B凹陷断层类型及分布特征
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摘要
珠江口盆地B凹陷的形成演化受神狐、珠琼、南海等多次构造运动控制。其基岩地层受太平洋和亚洲板块碰撞作用形成北东向浅层断褶构造带。该断褶构造带原始构造形态比较简单,但受后期多次拉张构造活动的改造,使得现今产出的裂陷构造内幕非常复杂。本文根据地震资料解释、钻井资料分析和油气勘探开发成果,详细阐述了B凹陷断层的类型、组合型式及断裂系统分布特征,包括:(1)断层主要有正、逆断层和走滑断层等类型;(2)断裂主要有羽状构造、花状构造、帚状构造和滑脱构造等组合型式;(3)根据断裂带走向,发育有8组不同走向的断裂带:北西西向、近东西向、北东东向、北西向、北东向、北北东向、北北西向、近南北向。
The formation and evolution of the B depression in the Zhujiangkou basin were controlled by the tectonic movements,which are Shenghu,Zhuqiong,South Sea movements,and so on.The collision between the Pacific plate and the Asian plate resulted in the shallow NE fault and fold tectonic zone in the basement of the basin.The zone had a simple shape at early stage,but multi-stage extensional movements reformed its characteristics and made the modern structures within the zone very complex.Depending on the seismic interpretation,the drilling analysis and the result of petroleum exploration,the present paper describes the fault type,fault pattern and distribution of faults in detail.The fault type in the study area is normal fault,reverse fault and strike fault.The combination pattern of the faults in the area is feather structure,flower structure,broom structure and detachment structure.The strike of the faults in the B depression includes NWW,nearly EW,NEE,NW,NE,NNW,NNE,NNW and nearly EW.
The formation and evolution of the B depression in the Zhujiangkou basin were controlled by the tectonic movements,which are Shenghu,Zhuqiong,South Sea movements,and so on.The collision between the Pacific plate and the Asian plate resulted in the shallow NE fault and fold tectonic zone in the basement of the basin.The zone had a simple shape at early stage,but multi-stage extensional movements reformed its characteristics and made the modern structures within the zone very complex.Depending on the seismic interpretation,the drilling analysis and the result of petroleum exploration,the present paper describes the fault type,fault pattern and distribution of faults in detail.The fault type in the study area is normal fault,reverse fault and strike fault.The combination pattern of the faults in the area is feather structure,flower structure,broom structure and detachment structure.The strike of the faults in the B depression includes NWW,nearly EW,NEE,NW,NE,NNW,NNE,NNW and nearly EW.
引文
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[6]陈汉宗,吴湘杰,周蒂,等.珠江口盆地中新生代主要断裂特征和动力背景分析[J].热带海洋学报,2005,24(2):52-61.
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[13]BADLEY M E.Practical Seismic Interpretation[M].Boston:International Human ResourcesDevelopment Corporation,1985.
[2]彭大钧,陈长民,庞雄,等.南海珠江口盆地深水扇系统的发现[J].石油学报,2004,25(5):17-23.
[3]陈长民.珠江口盆地东部石油地质及油气成藏条件初探[J].中国海上油气(地质),2000,14(2):73-83.
[4]庞雄,陈长民,施和生,等.相对海平面变化与南海珠江深水扇系统的响应[J].地学前缘,2005,12(3):167-177.
[5]吴培康.南海北部多幕裂陷作用与含油气系统[J].石油学报,1998,19(3):11-15.
[6]陈汉宗,吴湘杰,周蒂,等.珠江口盆地中新生代主要断裂特征和动力背景分析[J].热带海洋学报,2005,24(2):52-61.
[7]陈桂华.珠江口盆地珠三坳陷南边界断裂发育方式分析及其意义[J].海洋石油,2002,(3):33-38.
[8]GIBBS A D.Structural evolution of extensional basinmargins[J].Journal of the Geological Society,1984,141:609-920.
[9]葛双成.利用地震资料研究花状构造的方法[J].浙江地质,1995,11(1):91-99.
[10]许浚远,张凌云.略论拉张性“花状”构造成因[J].新疆石油地质,1996,17(1):14-17.
[11]王义天,李继亮.走滑断层作用的相关构造[J].地质科技情报,1999,18(3):30-34.
[12]NEEDHAM D T.断层几何形态和位移类型的分析[J].石油物探译丛,1998,(2):83-92.
[13]BADLEY M E.Practical Seismic Interpretation[M].Boston:International Human ResourcesDevelopment Corporation,1985.
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