In the southern part of the Kopeh Dagh basin, NE Iran, outcrop of the Kardeh fault damage zone in Mozduran carbonate formation provides an opportunity for investigation of the impact of faulting on permeability and porosity. For this purpose, three methods were focused on: 1) gas injection in oriented cores prepared parallel and perpendicular to fault strike and parallel to fault dip, 2) microscopic analysis and 3) determining variation of the degree of fractures connectivity in the fault damage zone. Results of tests show air-porosity and air-permeability increase from fault core toward host rock. Using microscopic studies, we attribute these variations to bioclasts destruction and filling, precipitation of calcite cement in fractures and pores, development of compaction structures such as stylolites and particle abrasion. Analyzing variation of the fractures connectivity in the fault damage zone in macro-scale shows degree of connectivity increases from host rock toward fault core (Y and X nodes). Clear dependence between this parameter and fluid flow is reflected by connected linear springs developed in the damage zone in close proximity to the fault core. Results of this study show that permeability in a fault zone is a scale dependent feature.

在伊朗东北部Kopeh Dagh盆地的南部，莫兹杜兰碳酸盐岩层中Kardeh断层破坏带的露头为调查断层对渗透率和孔隙度的影响提供了机会。为此，三种方法集中于：1）向定向岩心注气，该定向岩心与断层走向平行且垂直，与断层倾角平行，2）微观分析，3）确定断层破坏带中裂缝连通度的变化。测试结果表明，从断层岩心到基质岩的孔隙度和透气度增加。使用微观研究，我们将这些变化归因于生物碎屑的破坏和填充，方解石水泥在裂缝和孔隙中的沉淀，压实结构（例如，针铁矿和颗粒磨损）的发展。从宏观角度分析断层破坏带中裂缝连通性的变化，表明连通度从主岩到断层岩心（Y和X节点）增加。该参数与流体流量之间的明确相关性反映在损坏区域中紧靠断层核心的连接的线性弹簧中。这项研究的结果表明，断层带的渗透率是与尺度有关的特征。