渤海湾盆地潍北凹陷的亚分辨正断层预测
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摘要
本文应用平衡剖面的基本原理,通过斜向简单剪切模型预测了潍北凹陷北部古城-潍河口断裂的深部形态。依据此方法得出古城-潍河口断裂的滑脱深度为10.4km。以新近系底面为参考面,测量了新近系的损失面积,并计算了新近纪潍北凹陷的理论伸展量为3.1km。与目前二维地震解释剖面对比可知,亚分辨正断层的总伸展量为0.8km。依据统一构造应力场形成的断裂系统具有相似性的基本认识,对亚分辨正断层的分布和产状进行了定性预测。
The basic rule of balanced cross section is applied in this research.The oblique simple shear model is used to predict the geometry of Gucheng-Weihekou fault in north of Weibei basin.According to this model the depth of the detachment is about 10.4km.According to the referenced bed which is the bottom of Neocene,the Lost Area is measured,and the total amount of extension in Neocene in Weibei basin is about 3.1km.Compared with the interpretation from 2D seismic profile,the amount of extension resulted from sub-resolution normal fault is about 0.8km.In the same tectonic stress field,the fault systems in different levels are similar.According to this,the distribution and attitude of the sub-resolution normal fault are predicted.
The basic rule of balanced cross section is applied in this research.The oblique simple shear model is used to predict the geometry of Gucheng-Weihekou fault in north of Weibei basin.According to this model the depth of the detachment is about 10.4km.According to the referenced bed which is the bottom of Neocene,the Lost Area is measured,and the total amount of extension in Neocene in Weibei basin is about 3.1km.Compared with the interpretation from 2D seismic profile,the amount of extension resulted from sub-resolution normal fault is about 0.8km.In the same tectonic stress field,the fault systems in different levels are similar.According to this,the distribution and attitude of the sub-resolution normal fault are predicted.
引文
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[4]Walsh,J.J.,Watterson,J.,Yielding,G.,The importance of small scale faulting inregional extension.Nature,1991,351:391~393.
[5]Wu,S.,Fractal strain distribution and itsimplication for cross-section balancing,Journal of Structural Geology,1993,15:1497~1507.
[6]Gibbs,A.D.,Structural styles in basinformation.In:Tankard,A.J.,Balkwill,H.R.,eds.Extensional tectonics of thenorth Atlantic margins.AAPG Memoir,1989,46:81~93.
[7]Chai,B.,Test of geometric models relatingnormal fault shape to rollover geometry inlistric normal fault sand-box experiment:MS.Thesis,Univ.Alabama,Tuscaloosa,1994,130 p.
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[9]Groshong,R.H.,Jr.,Uniquedetermination of normal fault shapefrom hanging-wall bed geometry indetached half grabens:EclogaeGeologicae Helvetiae,1990,83:455~471.
[10]漆家福.Groshong,R.H.Jr,杨桥.用面积平衡原理预测伸展断陷盆地中岩层内部应变及亚分辨正断层的方法[J].地球学报,2002,27(6):696~702.
[11]Withjack,M.O.,Islam,Q.T.and LaPointe,P.R.,1995.Normal faults anddeformation in hangingwall-deformation:an experimental study.AAPG Bulletin,V.79:1~18.
[12]李晓清,汪泽成,程有义,等.拉分盆地分析与含油气性-以潍北盆地为例[M].山东东营:石油大学出版社,2003.
[13]张克鑫,漆家福.潍北盆地新生代构造演化及其与郯庐断裂带的关系[J].石油天然气学报,2005,27(6):817~820.
[14]Groshong,R.H.Jr.,Area balance,depthto detachment and strain in extension[J].Tectonics,1994,13:1488~1497.
[15]Groshong,R.H.Jr,Pashinb,J.C.,Chaic,Baolong,etal,Predicting reservoir-scale faults with area balance:application to growth stratigraphy.Journal of Structural Geology,2003,25:1645~1658.
[16]Nical A,Walsh J J,Gillespie PA,etal.Fault size distributions are theory powerlaw[J].Journal of Structural Geology,1996,18:191~197.
[2]Nicholas B.Woodward,Steven E.Boyerand John Suppe..Balanced Geologal Cross-Scetions.American Geophysical Union,1989.
[3]汤济广,梅廉夫,沈传波,等.平衡剖面技术在盆地构造分析中的应用进展及存在的问题[J].油气地质与采收率,2006,13(6):19~22.
[4]Walsh,J.J.,Watterson,J.,Yielding,G.,The importance of small scale faulting inregional extension.Nature,1991,351:391~393.
[5]Wu,S.,Fractal strain distribution and itsimplication for cross-section balancing,Journal of Structural Geology,1993,15:1497~1507.
[6]Gibbs,A.D.,Structural styles in basinformation.In:Tankard,A.J.,Balkwill,H.R.,eds.Extensional tectonics of thenorth Atlantic margins.AAPG Memoir,1989,46:81~93.
[7]Chai,B.,Test of geometric models relatingnormal fault shape to rollover geometry inlistric normal fault sand-box experiment:MS.Thesis,Univ.Alabama,Tuscaloosa,1994,130 p.
[8]Verrall,P.,Structural interpretation withapplications to North Sea problems:CourseNotes No.3,Joint Association ofPetroleum Exploration Courses(JAPEC),London.1982.
[9]Groshong,R.H.,Jr.,Uniquedetermination of normal fault shapefrom hanging-wall bed geometry indetached half grabens:EclogaeGeologicae Helvetiae,1990,83:455~471.
[10]漆家福.Groshong,R.H.Jr,杨桥.用面积平衡原理预测伸展断陷盆地中岩层内部应变及亚分辨正断层的方法[J].地球学报,2002,27(6):696~702.
[11]Withjack,M.O.,Islam,Q.T.and LaPointe,P.R.,1995.Normal faults anddeformation in hangingwall-deformation:an experimental study.AAPG Bulletin,V.79:1~18.
[12]李晓清,汪泽成,程有义,等.拉分盆地分析与含油气性-以潍北盆地为例[M].山东东营:石油大学出版社,2003.
[13]张克鑫,漆家福.潍北盆地新生代构造演化及其与郯庐断裂带的关系[J].石油天然气学报,2005,27(6):817~820.
[14]Groshong,R.H.Jr.,Area balance,depthto detachment and strain in extension[J].Tectonics,1994,13:1488~1497.
[15]Groshong,R.H.Jr,Pashinb,J.C.,Chaic,Baolong,etal,Predicting reservoir-scale faults with area balance:application to growth stratigraphy.Journal of Structural Geology,2003,25:1645~1658.
[16]Nical A,Walsh J J,Gillespie PA,etal.Fault size distributions are theory powerlaw[J].Journal of Structural Geology,1996,18:191~197.
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