断展褶皱要素对隐伏滑脱层深度及几何样式的约束:数学分析及其在重庆地区薄皮构造中的应用
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摘要
根据平衡地质剖面原理,在前人建立的断展褶皱数学模型基础上,进一步推导出断展褶皱要素组合对隐伏滑脱层发育深度和几何样式的限定。需要给定的参数组合包括:断展褶皱后翼倾角2θ、翼间角γ、背斜的构造高度h、背斜的宽度LAB、断端点T以上地层厚度h0。这些参数均可由野外实测或地震剖面解释中给定。由这些参数可以推导出:断坡的倾角α、断坡的顶点T到断层滑距开始降低的点P的距离LTP、地层的压缩量f0、隐伏滑脱层的深度h’。将此推导过程用VC++编程软件ZB1.0加以实现。根据地震剖面的解释及地表资料整理结果,把上述演算结果应用于重庆方斗山地区的茨竹亚背斜的2个剖面中,计算出隐伏滑脱层的深度分别为8.10~8.63 km,证明茨竹亚背斜隐伏主滑脱层发育于寒武系底部。滑脱断层断坡倾角为29°~45,°属于中等倾角。这一研究成果既可在理论上定量计算隐伏滑脱层样式和深度,又能指导对潜伏构造的勘探实践。
A geometrical model,which utilizes an assemblage of parameters of propagation anticline to constraint the depth and geometry of the blind detachment fault,is figured in this paper based on both balanced geosection principles and previous studies.The parameters measured from anticline in this model include backlimb angle,interlimb angle,the height of anticline,the width of the anticline and the thickness of the layer upwards point fault tip.The calculation could be practiced using software ZB1.0,which was programmed in VC++,and gives results of the detachment fault,including ramp dip angle,fault-parallel distance,strata draught and the deepth of flat.Parameters of anticline,which are from seismic and geological sections of the Cizhuya propagation anticline,respectively,give the consistent depth and dip angle of detachment fault at 8.10-8.63 km and 29°-45°.The depth indicates the detachment fault along the bottom of Cambrian,while the dip angle suggests a medium dip for the fault ramp.The results are also consistent with the regional geological estimation,and thus proved that the geometrical model is practicable to petroleum exploration and subsurface structures in this area.
A geometrical model,which utilizes an assemblage of parameters of propagation anticline to constraint the depth and geometry of the blind detachment fault,is figured in this paper based on both balanced geosection principles and previous studies.The parameters measured from anticline in this model include backlimb angle,interlimb angle,the height of anticline,the width of the anticline and the thickness of the layer upwards point fault tip.The calculation could be practiced using software ZB1.0,which was programmed in VC++,and gives results of the detachment fault,including ramp dip angle,fault-parallel distance,strata draught and the deepth of flat.Parameters of anticline,which are from seismic and geological sections of the Cizhuya propagation anticline,respectively,give the consistent depth and dip angle of detachment fault at 8.10-8.63 km and 29°-45°.The depth indicates the detachment fault along the bottom of Cambrian,while the dip angle suggests a medium dip for the fault ramp.The results are also consistent with the regional geological estimation,and thus proved that the geometrical model is practicable to petroleum exploration and subsurface structures in this area.
引文
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[11]梁顺军,梁顺彬,肖宇.地面地质横剖面在川东高陡构造地震资料处理解释中的作用[J].石油地球物理勘探,1996,3(1):43-48.
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[13]贾东,卢华复,魏东涛,等.断弯褶皱和断展褶皱中的油气运移聚集行为[J].南京大学学报:自然科学版,2002,38(6):747-755.
[14]李本亮,孙岩,陈伟.川东层滑系统及其油气地质意义[J].石油与天然气地质,1998,19(3):244-247.
[15]徐国盛,左友东,张文虎.川东石炭系大气田成藏条件分析[J].矿物岩石,2001,21(4):59-64.
[16]徐国盛,刘树根,袁海锋,等.川东地区石炭系天然气成藏动力学研究[J].石油学报,2005,26(4):12-16.
[17]丁道桂,郭彤楼,翟常博,等.鄂西—渝东区膝折构造[J].石油实验地质,2005,27(3):205-210.
[18]胡纯心,高林,刘锐.鄂西—渝东区构造特征及其发展演化[J].江汉石油科技,2000,10(2):59-62.
[19]Zheng Y D,Wang T,Ma MB,et al.Maximum effective momentcriterion and the origin of low-angle normal faults[J].Journal ofStructural Geology,2004,26:271-285.
[2]Hedlund C A.Fault-propagation,ductile strain,and displace-ment-distance relationships[J].Journal of Structural Geology,1997,19:249-256.
[3]Marrett R,Bentham P A.Geometric analysis of hybrid fault-propagation detachment folds[J].Journal of Structural Geology,1997,19:243-248.
[4]Yan D P,Zhou M F,Song H L,et al.A Mesozoic,thin-skinned to thick-skinned,multi-layer over-thrust system withinthe Yangtze Block(South China)[J].Tectonophysics,2003,361(3-4):239-254.
[5]Laubsher HP.Fold development in the Jura[J].Tectonophys-ics,1976,37:337-362.
[6]周小军,王钦军,薛林福.断弯褶皱正演模拟[J].世界地质,2002,21(4):327-331.
[7]Cristallini E O,Ramos V A.Thick-skinned and thin-skinnedthrusting in the La Ramada fold and thrust belt:crustal evolutionof the High Andes of San Juan,Argentina(32°SL)[J].Tec-tonophysics,2000,317:205-235.
[8]Chester J S,Chester F M.Fault-propagation folds above thrustswith constant dip[J].Journal of Structural Geology,1990,12:903-910.
[9]李忠权,冉隆辉,陈更生,等.川东高陡构造成因地质模式与含气性分析[J].成都理工大学学报:自然科学版,2002,29(6):605-609.
[10]颜丹平,汪新文,刘友元.川鄂湘边区褶皱构造样式及其成因机制分析[J].现代地质,2000,14(1):37-43.
[11]梁顺军,梁顺彬,肖宇.地面地质横剖面在川东高陡构造地震资料处理解释中的作用[J].石油地球物理勘探,1996,3(1):43-48.
[12]司马立强,张树东,刘海洲,等.川东高陡构造陡翼主要构造特征及测井解释[J].天然气勘探与开发,1996,16(4):25-28.
[13]贾东,卢华复,魏东涛,等.断弯褶皱和断展褶皱中的油气运移聚集行为[J].南京大学学报:自然科学版,2002,38(6):747-755.
[14]李本亮,孙岩,陈伟.川东层滑系统及其油气地质意义[J].石油与天然气地质,1998,19(3):244-247.
[15]徐国盛,左友东,张文虎.川东石炭系大气田成藏条件分析[J].矿物岩石,2001,21(4):59-64.
[16]徐国盛,刘树根,袁海锋,等.川东地区石炭系天然气成藏动力学研究[J].石油学报,2005,26(4):12-16.
[17]丁道桂,郭彤楼,翟常博,等.鄂西—渝东区膝折构造[J].石油实验地质,2005,27(3):205-210.
[18]胡纯心,高林,刘锐.鄂西—渝东区构造特征及其发展演化[J].江汉石油科技,2000,10(2):59-62.
[19]Zheng Y D,Wang T,Ma MB,et al.Maximum effective momentcriterion and the origin of low-angle normal faults[J].Journal ofStructural Geology,2004,26:271-285.
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