三角带冲断系统样式在龙门山北段、米仓山、大巴山地区应用探讨
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摘要
三角带是前陆褶皱冲断带的一种构造样式,研究它的形成条件和发育规律一方面有助于解释褶皱冲断带向前陆扩展的运动学,另一方面能够为地震剖面的解释工作提供现实的范例,有助于促进油气勘探的成功率。本文主要以龙门山北段,米仓山,大巴山为例,介绍三角带在三山中的应用。我们结合地表剖面、地震剖面与前人资料的对比解释,对各地区三角带发育可能性进行了分析。龙门山地区在矿山梁发现有三角带发育;在米仓山山前带三角带很发育;大巴山地区没有解释出三角带构造,野外勘察中发现有Ⅰ型三角带。龙门山、大巴山山前冲断带主要属于薄皮构造,主要以滑脱层跃迁式推覆,米仓山属于厚皮基底卷入构造,这可能也是米仓山三角带构造特别发育的原因之一。此外,印支晚期三山反转造山运动形成的三角带构造也可能被后期的构造运动所破坏。
Triangle zone is a tectonic style in fold-thrust belt,study in its formation and development pattern,on the one hand,helps to explain the Kinematics of the fold-thrust forward foreland,on the other hand to provide practical examples for interpretation of seismic section,and contribute to the promotion of success ratio in oil and gas exploration.This paper introduce the triangle zone in the North Longmen mountain,Micang mountain and Daba mountain.We compare the surface sections,seismic sections with previous data,and analysis the possibility of the development of the triangle zone in each region.There is triangle zone in Kuangshanliang in the north of Longmen mountain and Michang mountain,but not in Daba Mountain.Longmen mountain and Daba mountain piedmont thrust zone are mainly thin-skinned structures,mainly thrust in " jump connection" by the Slip layer,Micang mountain are involved in the thick-skinned basement structure,which may be the reasons of the well development of the triangle zone structure.In addition,triangle zone structures formed in late Indo-Chinese epoch may also be damaged by the latter tectonic movements.
Triangle zone is a tectonic style in fold-thrust belt,study in its formation and development pattern,on the one hand,helps to explain the Kinematics of the fold-thrust forward foreland,on the other hand to provide practical examples for interpretation of seismic section,and contribute to the promotion of success ratio in oil and gas exploration.This paper introduce the triangle zone in the North Longmen mountain,Micang mountain and Daba mountain.We compare the surface sections,seismic sections with previous data,and analysis the possibility of the development of the triangle zone in each region.There is triangle zone in Kuangshanliang in the north of Longmen mountain and Michang mountain,but not in Daba Mountain.Longmen mountain and Daba mountain piedmont thrust zone are mainly thin-skinned structures,mainly thrust in " jump connection" by the Slip layer,Micang mountain are involved in the thick-skinned basement structure,which may be the reasons of the well development of the triangle zone structure.In addition,triangle zone structures formed in late Indo-Chinese epoch may also be damaged by the latter tectonic movements.
引文
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[2]Jones P B.Oil and gas beneath east-dippingunder-thrust faults in the AlbertaFoothills,Canada[A].In:Powers PB,ed.Geologic studies of the Cordilleran thrustbelt[C],1982.
[3]贾承造.前陆冲断带油气勘探[M].石油工业出版社,2000.
[4]许志琴.陆内俯冲及滑脱构造——以我国几个山链的地壳变形研究为例[J].地质论评,1986,(1).
[5]贾东,陈竹新,贾承造,魏国齐,李本亮,张惬,魏东涛,沈杨.2003.龙门山褶皱冲断带构造解析与川西前陆盆地的发育[J].高校地质学报,9(3):462~469.
[6]徐世琦,曾庆,唐大海等.江油厚坝油砂岩成藏条件分析[J].天然气勘探与开发,2005,28(3):1~4.
[7]袁学诚,任纪舜,徐明才,唐文榜等.东秦岭邓县—南漳反射地震剖面及其构造意义[J].中国地质,2002,(1).
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