乐山—龙女寺古隆起北斜坡走滑断裂变形特征及其油气地质意义

doi:10.7657/XJPG20260206

摘要/Abstract

摘要：

四川盆地乐山—龙女寺古隆起北斜坡发育大量走滑断裂，断距小，平面组合复杂，多期活动的定量约束不足。基于最新连片三维地震资料重点层位和断裂精细解释，统计地层伸展量和厚度域沉降量变化，分析走滑断裂变形特征、演化期次及其对油气成藏的影响。研究发现，北斜坡走滑断裂近东西向、北西—南东向展布，剖面上具有直立形、“Y”字形、花状构造等特征，平面上发育拉分状、线状、雁列状和马尾状断裂组合样式，具有分层、分段差异变形规律。结合区域构造运动背景，认为北斜坡走滑断裂多期次、继承性发育，其中晚震旦世—早寒武世和中—晚二叠世为主要活动期，对应四川盆地绵阳—长宁拉张槽和蓬溪—武胜台凹发育时间。区内走滑断裂的形成演化贯穿着油气生成、运移、聚集和破坏的过程，对二叠系油气成藏具有控制作用。

关键词: 四川盆地, 乐山—龙女寺古隆起, 北斜坡, 走滑断裂, 变形特征, 构造演化, 油气成藏

Abstract:

Numerous strike-slip faults with small throws, complex planar configurations, and insufficient quantitative constraints on multi-phase activities are developed on the northern slope of the Leshan-Longnvsi paleouplift in the Sichuan Basin. Based on detailed interpretation of key horizons and faults using newly acquired contiguous 3D seismic data, this study investigates the changes in stratigraphic extension and thickness-domain subsidence,and analyzes the deformation characteristcs and evolutionary stages of the strike-slip faults, and their influences on hydrocarbon accumulation. The research results reveal that the strike-slip faults on the northern slope primarily trend in nearly EW and NW-SE. In cross-section, they exhibit vertical, Y-shaped, and flower structure geometries. On plan view, they display combinations such as miniature pull-apart faults, linear faults, en echelon faults, and horsetail faults. The strike-slip faults are characterized by layered and segmented structural deformation. Considering the regional tectonic setting, the strike-slip faults on the northern slope are interpreted to have undergone multistage and inherited development, with the Late Sinian-Early Cambrian and Middle-Late Permian being the primary active periods, which respectively correspond to the developmental timing of the Mianyang-Changning extensional trough and Pengxi-Wusheng subsag within the Sichuan Basin. The formation and evolution of the strike-slip faults in the study area took place across hydrocarbon generation, migration, accumulation, and destruction process, playing a controlling role in the formation of the Permian reservoirs.

Key words: Sichuan Basin, Leshan-Longnvsi paleouplift, northern slope, strike-slip fault, deformation characteristic, tectonic evolution, hydrocarbon accumulation

中图分类号:

P552

王新岚, 李智武, 谢曜励, 梁虹, 张灵力, 徐宝亮, 郭冉, 陈辉, 游李伟. 乐山—龙女寺古隆起北斜坡走滑断裂变形特征及其油气地质意义[J]. 新疆石油地质, 2026, 47(2): 172-183.

WANG Xinlan, LI Zhiwu, XIE Yaoli, LIANG Hong, ZHANG Lingli, XU Baoliang, GUO Ran, CHEN Hui, YOU Liwei. Deformation and Petroleum Significance of Strike-Slip Faults on the Northern Slope of the Leshan-Longnvsi Paleouplift[J]. Xinjiang Petroleum Geology, 2026, 47(2): 172-183.

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