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

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.