S和S-L型构造岩的显微组构与渗透性能的声学识别

Acoustic distinguishing feature to microstructure and permeability of S- and(S-L)-tectonites

为了解断裂与流体渗透的动态关系,针对S和S-L型构造岩及其原岩,采用超声波实验方法测算岩石的波速和衰减,经过与孔隙度等微孔隙结构参数的对比和相关分析,研究认为:S-构造岩和(S-L)-构造岩具有明显的各向异性,在平行面理方向上,波速和品质因子较大,渗透性最强,是最佳的流体运移方向;在垂直面理方向上,波速和品质因子较小且通常小于原岩的,封闭性最强,是最佳的封闭流体方向。波速和品质因子分别与孔隙度具有负线性关系,与气柱高度、突破压力等表征岩石封闭性能的参数具有正相关关系。张性角砾岩的波速和品质因子小于原岩的,而渗透性增强,并无明显的各向异性。

In order to investigate the dynamic relationship between fault and fluid flow, the comparison and correlation analysis for wave velocity and attenuation of S- and （S-L）-tectonites as well as the original rocks with microscopic pore structure parameters including porosity et al. were done. Wave velocity （V） and quality factor （Q） were measured by the ultrasonic method. S- and （S-L）-tectonites are obviously anisotropic. Compared with their original rocks, the V, Q and permeability are greater in parallel direction with foliation, and usually less perpendicular to it. The direction with minimal V and Q （ viz. perpendicular direction to foliation） in S- and （S-L） -tectonites is the best for fluid to seal, on the contrary it is the best to flow. V is negatively linearly correlated with porosity and positively correlated with gas column height and breakthrough pressure, so does Q. While V and Q of tensile fault breccia, which is not obviously anisotropic, are less than those of original rocks, and the permeable capability is greater.