湘西大庸上震旦统灯影组震裂角砾岩

SHATTERED BRECCIA OF THE UPPER SINIAN DENGYING FORMATION IN DAYONG, WEST HUNAN PROVINCE

湘西大庸上震旦统灯 影组中碳酸盐 岩震裂角砾岩 垂向序列由 ５ 个层段组成，自 下而上分别为： 下伏未震层段、裂缝层段、微褶曲层 段，、角砾岩层段及上覆未震层段。一个垂向序列代表了一次地 震灾变事件。与已有的标准序 列比较，缺乏液化均一层段，这可能反映 了固结程度较高的较刚性岩体的破 裂机理。震裂角砾岩是一种较好的 储集岩体，以发生地震的断裂系统 为中心，组成向两则储集岩 体尖灭的岩性圈闭类型。

The vertical succession of carbonate rock's shattered breccia in the Upper Sinian Dengying Formation of Dayong, West Hunan province consists of five layers, from bottom to top including the underlying unshocked layer, the fissure layer, the microfold layer, the breccia layer and overlying unshocked layer. A vertical succession represents a seismic catastrophic event. It lacks liquefied homogeneous layers compared with the preexisting normal succession. This may reflects the fracturing mechanism of the more rigid rock body with higher solidification degree. Shattered breccia is a kind of better reservoir rock body. Centered on the fracture systems where earthquake took place, it forms a lithologic trap type thinning out towards bilateral reservoir rock body.