板桥凹陷钱圈地区主干断层活动性分析
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摘要
基于对板桥凹陷钱圈三维工区六个层面断层系统解释的基础之上,分析了钱圈地区Es3、Es2、Es1x、Es1z、Es1s、Ed底界断层平面分布特征,并选取区内垂直于断层的7条地震剖面,对沉积地层进行剥蚀厚度恢复和压实校正后综合运用生长指数、活动速率和古落差三种指标研究断层活动性。研究结果表明:钱圈地区内主要由两组走向为NE和NW近似于垂直的断层组成,且都为正断层,其中沧东断裂为一级断层,大张陀断裂、G39断裂和B60断裂为二级断层,其余为三级断层,倾角大多在55°~70°之间。三种活动性指标揭示了研究区内的主干断层大多为长期活动控沉积断层,断层发育经历了两幕演化,从Es3段至Es1x为第一幕,其中Es2段为活动高峰期;从Es1z到Ed组为第二幕,Es1s段为活动高峰期,而且每一幕都经历由弱到强再弱的变化过程。正是这种断层活动性的差异,使得钱圈地区内沿断裂带发育一系列上超、尖灭和相变等圈闭类型。
Based on Faults system interpretation of six layers of the QianQuan three-dimensional work area in BanQiao Depression, Es3, Es2, Es1x, Es1z, Es1s, Ed plane distribution characters in the QianQuan area are analyzed, and seven 3D seismic profiles which are vertical with these faults are studied. After reconstructing denudation thickness of the strata and compaction emendation, faults growth index, fault moving rate and fault older throw are used comprehensively to study,the activity of the faults. The analysis indicates the following: there are NE and NW strike faults which are vertical in the work area and they are all normal faults. The CangDong fault is the first-order fault, DaZhangtuo, G39 and B60 faults are the second-order fault and the rest are third-order fault. The obliquities are almost between 55°and 70°. Analyses of three active indicators of first-order fault and second-order fault in the work area show that the faults have undergone two episodic changes. From Es3 to Es1x is the first episode and Es2 is the active flood tide; from Es1z to Ed is the second episode and Es1s is the active flood tide. Every change is from weak to strong and then to weak again, it is the differences of faults activity that form a series of traps of onlap, pinchout and phase change along the faults boundary.
Based on Faults system interpretation of six layers of the QianQuan three-dimensional work area in BanQiao Depression, Es3, Es2, Es1x, Es1z, Es1s, Ed plane distribution characters in the QianQuan area are analyzed, and seven 3D seismic profiles which are vertical with these faults are studied. After reconstructing denudation thickness of the strata and compaction emendation, faults growth index, fault moving rate and fault older throw are used comprehensively to study,the activity of the faults. The analysis indicates the following: there are NE and NW strike faults which are vertical in the work area and they are all normal faults. The CangDong fault is the first-order fault, DaZhangtuo, G39 and B60 faults are the second-order fault and the rest are third-order fault. The obliquities are almost between 55°and 70°. Analyses of three active indicators of first-order fault and second-order fault in the work area show that the faults have undergone two episodic changes. From Es3 to Es1x is the first episode and Es2 is the active flood tide; from Es1z to Ed is the second episode and Es1s is the active flood tide. Every change is from weak to strong and then to weak again, it is the differences of faults activity that form a series of traps of onlap, pinchout and phase change along the faults boundary.
引文
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[2]王燮培,费琪,张家华.石油勘探构造分析[M].武汉:中国地质大学出版社,1990:22-23.
[3]赵勇,戴俊生.应用落差分析研究生长断层[J].石油勘探与开发,2003,30(3):13-15.
[4]李勤英,等.断层活动速率研究方法及应用探讨[J].断块油气田,2000,7(2):15-17.
[5]吴智平,李伟,郑德顺.沾化凹陷中、新生代断裂发育及其形成机制分析[J].高校地质学报,2004,10(3):405-416.
[6]中国石油地质志(卷四)~大港油田[M].北京:石油工业出版社,1991.
[7]Bosworth W.Geometry of propagating contimental rifting[J].Nature,1985,(316):625-627.
[8]徐开礼,朱志澄.构造地质学[M].北京:地质出版社,1984.
[9]肖英玉,郝雪峰.断层生长指数在层序地层单元中应用的局限性[J].油气地质与采收率,2003(10):1-5.
[10]王锦喜,刘琼,张树林.江汉盆地西南缘主干断层活动性分析[J].重庆科技学院学报,2005.9,7(3):7.
[11]魏永佩,陈会鑫.沉积盆地碎屑岩原始厚度恢复经验图版[J].石油与天然气地质,1999(1):90-93.
[12]王书宝,等.惠民凹陷新生代断裂活动特征研究[J].地质力学学报,2007.3,13(1):94-95.
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