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四川盆地拉张断裂在地震资料中的识别研究,印证了晚元古-早古生代盆地处于张性构造作用环境。结合川中地区新老探井地层对比,提出存在早寒武世拉张槽的观点。使用四川盆地钻至寒武系和震旦系的探井约束解释覆盖全盆地的二维、三维地震资料后,以下寒武统麦地坪组、筇竹寺组和沧浪铺组3套地层总厚度展布特征,揭示了拉张槽在平面上为近南北走向;确定了四川盆地早寒武世拉张槽两侧边界(断裂)东陡西缓的特征,中段呈箕状拗陷构造形态。以其展布中线区域,命名为绵阳-乐至-隆昌-长宁拉张槽。
The identification of tensile faults in the Sichuan Basin in seismic data confirms that the Late Proterozoic-Early Paleozoic basins are in an extensional tectonic setting. Based on the comparison of the new exploration wells in central Sichuan Basin, this paper puts forward the viewpoint that there is a pre-Cambrian pull-groove. Using the exploration well constraints from drilling in the Cambrian to Sinian in the Sichuan Basin to explain the 2D and 3D seismic data covering the whole basin, the following three sets of stratums of the Maidiping, Qiongzhusi and Canglangpu formations Thickness distribution characteristics of the tensioned trenches are revealed. The plane of the tensioned trenches is nearly north-south direction. The characteristics of the eastward steepness and slowness of the boundaries (faults) on both sides of the pullout trenches of the Early Cambrian in the Sichuan Basin are determined. . With its midline distribution area, named Mianyang - music to - Longchang - Changning pull slot.