应用落差分析研究生长断层
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摘要
将生长断层的落差定义为两盘地层厚度之差 ,将其某时期古落差定义为该时期两盘沉积的厚度差。生长断层落差可以根据对构造演化剖面或地质剖面的直接测量而计算 ,也可以对经时深转换的地震剖面进行测量而计算 ,还能够通过某地层顶、底构造图的深度计算。与断层生长指数分析相比 ,落差分析不受上升盘地层是否缺失的限制 ,不受盆地整体沉降幅度的影响 ,地质含义明确 ,容易对比断层的活动强度 ,方法简单、可操作性强。采用该方法分析东营凹陷始新世中期沙三下亚段沉积期明显活动的断层有 45条 ,当时断陷最深的地区位于陈南断层西段、胜永断层中段和中央主断层之间。图 2表 2参 6
Growth fault fall is defined as the layer thickness difference between two walls, and paleo fall of certain moment is defined as the sedimentary thickness difference of this moment, which can be measured and calculated directly by structural evolvement section or geologic section and top and bottom contour maps. Also, it can be measured and computed through time deep transform on seismic profile. Compared with the fault growth index analysis, fault fall analysis can be used no matter whether some layers are short of on the upthrow side; secondly, it isn′t influenced by the depth of basin subsidence; then it has a clear geologic meaning and can easily identify the fault active intensity. The fault fall analysis is a simple method and can be easily mastered and operated. Using this method, 45 faults in lower part of the Es 3 member of the Eocene Shahejie Formation in Dongying Sag were analyzed, which were in obvious movement at that time, and the conclusions are as follows: the deepest tract of fault subsidence was located within the western part of Chennan fault, the middle part of Shengyong fault and the central major fault.
Growth fault fall is defined as the layer thickness difference between two walls, and paleo fall of certain moment is defined as the sedimentary thickness difference of this moment, which can be measured and calculated directly by structural evolvement section or geologic section and top and bottom contour maps. Also, it can be measured and computed through time deep transform on seismic profile. Compared with the fault growth index analysis, fault fall analysis can be used no matter whether some layers are short of on the upthrow side; secondly, it isn′t influenced by the depth of basin subsidence; then it has a clear geologic meaning and can easily identify the fault active intensity. The fault fall analysis is a simple method and can be easily mastered and operated. Using this method, 45 faults in lower part of the Es 3 member of the Eocene Shahejie Formation in Dongying Sag were analyzed, which were in obvious movement at that time, and the conclusions are as follows: the deepest tract of fault subsidence was located within the western part of Chennan fault, the middle part of Shengyong fault and the central major fault.
引文
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[4] GibbsAD .Balancedcross sectionconstructionfromseismicsectionsinareaofextensionaltectonics[J].Jour.Stru.Geol.,1983,5(2).
[5] 王燮培,费琪,张家骅.石油勘探构造分析[M ].武汉:中国地质大学出版社,1990.
[6] 赵密福,刘泽容,信荃麟,等.惠民凹陷临南地区断层活动特征及控油作用[J].石油勘探与开发,2000,27(6):911.
[2] 陆克政,戴俊生,陈清华,等.构造地质学教程[M ].东营:石油大学出版社,1996.151156.
[3] WernickeB ,BurchfielBC .Modelsofextensionaltectonic[J].Jour.Stru.Geol.,1982,4:105115.
[4] GibbsAD .Balancedcross sectionconstructionfromseismicsectionsinareaofextensionaltectonics[J].Jour.Stru.Geol.,1983,5(2).
[5] 王燮培,费琪,张家骅.石油勘探构造分析[M ].武汉:中国地质大学出版社,1990.
[6] 赵密福,刘泽容,信荃麟,等.惠民凹陷临南地区断层活动特征及控油作用[J].石油勘探与开发,2000,27(6):911.
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