扭动作用在苏北盆地构造体系中的表现及其意义

Rquusuttatlon of Torsional ActIon In Tectonic System of Subel Basin and its Significance

在苏北盆地构造体系中 ,存在着逆断层、雁行状排列的断鼻断块群、凹陷主控断层两侧的羽状断层、主控断层的左阶式错位排列及区域北西向延伸的构造带等构造特征。这些构造特征是由于不同级别的断层右行压扭和相应块体的旋转扭动而形成的 ,对盆地的油气生成、聚集和圈闭成藏有重要控制作用。通过分析 ,认为应加强对北西向正向带与凹陷叠加地区、断鼻断块群。

In the tectonic system in Subei Basin, there exist reverse faults, nose-like blocks in an echelon arrangement, pinnate faults occurring at both sides of a major controlling fault of the depression, sinistral step dislocation arrangement of the major fault and northwest regional structural belt. These structural features resulted from dextral compresso-shear of diverse scale faults , rotation and torsion in relevant blocks play an important control action on petroleum generation, accumulation and pool-forming in the basin. Through analysis,it is considered that evaluation and exploration would be enhanced in the areas of northwest positive belt and depression superposition, the nose-like blocks and the area interleaving between the major faults of dextral and sinistral steps.