方正断陷三维区下切谷的形成及分布特征研究
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摘要
发育在方正断陷的下切谷主要分布在区域不整合面之上,从区域上无法简单地用"顺源堆积"来解释。于是从断陷的构造演化角度出发,确认了方正断陷下切谷形成的两种填充模式。根据下切谷的定义和其在地震上的特征,在地震剖面上详细刻画出宝泉岭组底界面T3和白垩系顶界面T5的下切谷分布图。大致确定了下切谷在平面上的分布范围,进而能够更准确地判断物源方向,寻找出沟前扇体。因此,下切谷的研究为方正断陷三维区白垩系和下第三系细分层沉积相的研究提供了重要的指导依据。
The development in the entrenched valleys of the Fangzheng fault mainly distributed in the area above uncomformity surface,it can't be simply explained by using" accumulate along the source "in the region.So from the angle of the structural evolution,two filling mode about the formation of the entrenched valleys of the Fangzheng fault are notarized.According to the definition and the characteristics in seismic profile of the entrenched,the entrenched valleys distribution about the Baoquanling group's bottom interface(T3) and the Cretaceous system's top interface(T5) can be highly detailed out.As a result,the entrenched valleys distribution on plane roughly can be defined,and the provenance direction can be judged more accurately,then the precingular fan are loohed for.So,the search on the entrenched valleys offers important guideline basis for the research of the sedimentary facies,that about the Cretaceous system and the Eofene system subdivision of reservoir in the 3D of the Fangzheng fault.
The development in the entrenched valleys of the Fangzheng fault mainly distributed in the area above uncomformity surface,it can't be simply explained by using" accumulate along the source "in the region.So from the angle of the structural evolution,two filling mode about the formation of the entrenched valleys of the Fangzheng fault are notarized.According to the definition and the characteristics in seismic profile of the entrenched,the entrenched valleys distribution about the Baoquanling group's bottom interface(T3) and the Cretaceous system's top interface(T5) can be highly detailed out.As a result,the entrenched valleys distribution on plane roughly can be defined,and the provenance direction can be judged more accurately,then the precingular fan are loohed for.So,the search on the entrenched valleys offers important guideline basis for the research of the sedimentary facies,that about the Cretaceous system and the Eofene system subdivision of reservoir in the 3D of the Fangzheng fault.
引文
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7郭学斌,李子顺.应用高分辨率地震技术识别下切谷—松辽盆地杏树岗泉头组解释实例.石油地球物理勘探,2010;45(增刊1):154—157
2 Fisk R,Mcfalan jr E.LateQuaternary deltaic deposits of the Missis-sippi River.Crust Earth Symposium,Geologic Society of AmericaSpecial Paper,1995;67:297—302
3尹微,樊太亮,许浩,等.下切谷的特征及油气地质意义.大庆石油地质与开发,2006;25(2):21—23
4杨懋新,戴跃进,李清仁,等.乌尔逊凹陷下切谷的特征及成因.大庆石油地质与开发,2003;22(5):12—13
5 Dilce F.Facies architecture in a tectonically influenced estuarineincised valley fill of Miocene age,northern Brazil.Journal of South A-merican Earth Sciences,2004;17:267—284
6杨道庆,邱荣华,赵追,等.泌阳凹陷北坡下切谷—低位扇沉积体系及其油气勘探意义.石油地球物理勘探,2002;37(5):486—490
7郭学斌,李子顺.应用高分辨率地震技术识别下切谷—松辽盆地杏树岗泉头组解释实例.石油地球物理勘探,2010;45(增刊1):154—157
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