河125断层几何学特征及其沉积控制作用

Geometry characteristics of Fault He125 and the control on the deposition

通过对河125断层进行三维地震解释,以及对河125断层平面、剖面几何学特征进行研究,从宏观和微观2方面掌握了河125断层的几何学特征:平面上呈西南撒开东北收敛的帚状分布,不同地区的弯曲程度不尽相同;剖面上呈座椅状,生长指数对称分布,弯曲处落差相对较大。沉积砂体的分布与沉积断裂及其组合样式有密切联系,表现在对沉积体系发育、展布及类型的控制作用上。断面体系和断层几何特征是控制砂体的重要因素,古地形低洼处是三角洲前缘砂体滑塌首先到达的地方,浊积扇发育,极易形成口袋状聚砂,故将其称为弧扇耦合现象。

By means of 3D seismic explanation and the study on the characteristics of plane and profile geometry of Fault He125, the geometry characters of the fault are figured out from both macroscopy and microscope view： dispersed in the southwest and constringed in the northeast as a broom on the plain; with different curvature in different area. The profile presents like a chair. Growth index distributes symmetrically, and the fault throw is larger in the curved area The distribution of sand body has a close relation with the growth fault and its composite sample, presenting as the control action in the development, exhibition and types of the depositing system. Fault system and geometry character are the important factors to control the sand body. The depression of paleotopography is the place the sand body of the fan front arrived earliest, where turbidite fan was developed and pocket like sand body was easily formed. So it is called the phenomenon of bow and fan coupling.