川西坳陷X区块须家河组三维地震构造解释

在三维地震资料解释基础上，对川西坳陷西部龙门山前缘X区块上三叠统须家河组断层和褶皱构造的特征及构造样式进行了分析。结果表明，X区块须家河组构造变形较复杂，断层按走向主要有北东和北北东或近南北向两组，分别形成于印支早中期和燕山期。褶皱的发育受断层控制，多为断层相关褶皱。须家河组构造样式主要有滑脱褶皱、铲形逆断层及其上盘断层褶皱组合、断展褶皱、对冲-背冲断层组合、冲起构造、断弯褶皱等六种类型。

3D SEISMIC STRUCTURAL INTERPRETATION OF XUJIAHE FORMATION IN BLOCK X OF WEST DEPRESSION IN SICHUAN BASIN

On the basis of 3D seismic data interpretation, the paper analyzed the properties and structure patterns of the faults and folds in Xujiahe formation of the upper Triassic in Block X of the Longmenshan foreland in west depression of Sichuan basin. The analysis results indicate that the structure deformations are very complicated in Xujiahe formation in X Block, the faults consist of the fault with northeast or north-northeast strike and that with south-north strike, which are formed during the early- and middle-Indochina stage and Yanshanian stage respectively. Controlled mainly by faults, most of the folds in the X Block belong to fault-related folds. Six types of structural patterns are recognized in Xujiahe formation, including decollement folds, combination of the reverse listric fault and the folds in the upper wall, fault-propagation folds, antithetic and ramp thrust blocks, pop-up structures, and fracture-bend fold.