In carbonates, fault zones strongly influence local reservoir properties and act as drains or barriers to flows. In the case of reactivated faults, newly developed fracture and fault systems rework and cross-cut pre-existing fault structures. The modifications of initial damage zone and fault core properties alter the fault zone properties and potentially created new fluid pathways. This study of the polyphase Castellas fault zone, developed as normal and later reactivated as strike slip, characterizes the structural pattern related to tectonic reactivation, and estimates the hydraulic behaviour of the fault zone through time. This fault affects carbonates located on La Fare anticlinal (SE France). High resolution mapping, 848 measurements and cross-sections allowed to discriminate the fault structures and the lateral heterogeneity of its architecture. Along the 850m-long studied damage zone we identify 8 principal fault planes, 2 relay zones, 19 secondary fault planes, and fault lenses. The study shows that the fault zone developed as isolated fault segments during the normal activity and acted as a drain to fluid flows during its nucleation. Later strike-slip reactivation led to the main structures visible presently as a well-connected fracture network and un-cemented breccia allowing the fault to be a drain to fluid flows.

在碳酸盐岩中，断层带强烈影响当地储层性质，并充当排水沟或流动屏障。在重新激活的断层的情况下，新开发的裂缝和断层系统改造和横切预先存在的断层结构。初始损伤区和断层核心特性的修改改变了断层特性并可能创造新的流体通道。这项对多期 Castellas 断裂带的研究，正常发育，后来以走滑的形式重新激活，描述了与构造重新激活相关的结构模式，并估计了断裂带随时间的水力行为。该断层影响位于拉法尔背斜（法国东南部）的碳酸盐。高分辨率映射，848 个测量和横截面允许区分断层结构及其结构的横向异质性。沿着 850m 长的研究损伤带，我们确定了 8 个主要断层、2 个中继带、19 个次断层和断层透镜。研究表明，断层带在正常活动期间发展为孤立的断层段，并在其成核过程中充当流体流动的排水管。后来的走滑重新激活导致目前可见的主要结构为连接良好的裂缝网络和未胶结的角砾岩，使断层成为流体流动的排水管。研究表明，断层带在正常活动期间发展为孤立的断层段，并在其成核过程中充当流体流动的排水管。后来的走滑重新激活导致目前可见的主要结构为连接良好的裂缝网络和未胶结的角砾岩，使断层成为流体流动的排水管。研究表明，断层带在正常活动期间发展为孤立的断层段，并在其成核过程中充当流体流动的排水管。后来的走滑重新激活导致目前可见的主要结构为连接良好的裂缝网络和未胶结的角砾岩，使断层成为流体流动的排水管。