龙门山中段前山带构造特征及其形成演化
网络出版日期: 2008-12-15
Structural features and evolution in the piedmont belt in the middle segment of Longmen Mountains
Online published: 2008-12-15
论述了龙门山中段前山带的基本构造特征,并讨论了龙门山中段地质演化过程。研究认为:龙门山中段前山带主要由北川—映秀断裂、安县—都江堰断裂2 条走向北东、倾向北西的大断裂和两者之间的彭灌推覆体组成。其中,北川—映秀断裂早期以弱韧性逆冲为主,晚期发育浅部的脆性变形,而安县—都江堰断裂为简单的脆性变形,推覆体内部发育大量与推覆作用有关的逆冲断片,总体上呈叠瓦状分布,由北西向南东推覆。该区地质演化特征:震旦纪—中三叠世为稳定大陆边缘环境,晚三叠世早期过渡为陆相碎屑岩沉积阶段,到上三叠统须家河组三段沉积末,与逆冲推覆构造相伴生的前陆盆地出现,后期逆冲推覆活动进一步发展,新生代时期整体抬升,大规模逆冲推覆,形成现今的复杂构造格局。
李传亮 . 龙门山中段前山带构造特征及其形成演化[J]. 岩性油气藏, 2008 , 20(4) : 59 -64 . DOI: 10.3969/j.issn.1673-8926.2008.04.011
The basic structural features in the piedmont belt in the middle segment of Longmen Mountains and the geological evolution are discussed. The research shows that the piedmont belt in the middle segment of Longmen Mountains is composed of Beichuan-Yingxiu fault, Anxian-Dujiangyan Dam fault and the nappe between them.Beichuan-Yingxiu fault was weakly thrusted in the early stage and was deformed in the late stage. Anxian-Dujiangyan Dam fault was deformed. Thrust plane developed well in the nappe, which was thrusted from NW to SE. The geological evolution displays that it is stable continental margin environment from Sinian to Middle Triassic and is continental clastic sedimentary stage in Late Triassic, and the foreland basin associated with the thrust tectonic appeared at the end of the Xujiahe Formation in Upper Triassic, the thrust activities further developed and entirely uplifted, which finally formed the current complex structure pattern.
Key words: reservoir; dual-porosity media; carbonate rocks; well test; production
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