龙泉山构造带构造特征及扭动形迹成因探讨

STRUCTURAL CHARACTERISTICS AND ORIGIN OF TWISTED TRACES IN LONGQUANSHAN TECTONIC BELT

龙泉山构造带位于川西前陆盆地凹陷带与前陆斜坡带之间,是油气勘探的潜力区块。通过地表地层陡带、断层分布特征研究,结合地震剖面反射特征及钻井资料,运用断层相关褶皱理论,建立了龙泉山构造带的构造模型,进行了构造精细解释,认为其构造特征在剖面上可分为上、下两个构造层,在平面上可分为南、中、北三段。针对龙泉山背斜扭动形迹的成因,从南北段构造样式差异、构造应力、构造运动期次等方面进行了初步探讨。

Located between depression and slope belts in the West Sichuan Foreland Basin,Longquanshan Tectonic Belt is a poten tial block for oil and gas exploration.In this study,according to distribution characteristics of both steep zones of surface formation and faults,a structural model is established for Longquanshan Tectonic Belt by adopting the theory of fault-related fold and combining seismic-section reflection characteristics with drilling data.In addition,based on this model,a fine interpretation is implemented.Results show that on the section,this tectonic belt can be divided into two structural layers of the upper and the lower,and in the plane three segments of the south,the middle and the north,respectively.Moreover,some aspects on both south and north segments,including difference of structural style,structural stress and movements,are discussed in order to analyze origins of twisted traces for Longquanshan anticline.