Microporous carbonate rocks form important reservoirs with permeability variability depending on sedimentary, structural, and diagenetic factors. Carbonates are very sensitive to fluid–rock interactions that lead to secondary diagenetic processes like cementation and dissolution capable of modifying the reservoir properties. Focusing on fault-related diagenesis, the aim of this study is to identify the impact of the fault zone on reservoir quality. This contribution focuses on two fault zones east of La Fare anticline (SE France) crosscutting Urgonian microporous carbonates. Overall, 122 collected samples along four transects orthogonal to fault strike were analyzed. Porosity values have been measured on 92 dry plugs. Diagenetic elements were determined through the observation of 92 thin sections using polarized light microscopy, cathodoluminescence, carbonate staining, SEM, and stable isotopic measurements (δ¹³C and δ¹⁸O). Eight different calcite cementation stages and two micrite micro-fabrics were identified. As a main result, this study highlights that the two fault zones acted as drains canalizing low-temperature fluids at their onset and induced calcite cementation, which strongly altered and modified the local reservoir properties.

中文翻译：

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Urgonian微孔碳酸盐岩断层带的成岩作用演化，对储层物性的影响（普罗旺斯（Provence）？法国东南部）

碳酸盐微孔岩形成重要的储集层，其渗透率随沉积，结构和成岩因素而变化。碳酸盐对流体－岩石相互作用非常敏感，流体相互作用导致次生成岩作用，例如胶结作用和溶解作用，能够改变储层性质。着眼于断层相关的成岩作用，本研究的目的是确定断层带对储层质量的影响。该贡献集中在La Fare背斜以东（法国东南部）横切的Urgonian微孔碳酸盐岩的两个断层带上。总体上，沿着垂直于断层走向的四个断面分析了122个收集的样本。孔隙率值是在92个干塞上测得的。通过使用偏光显微镜观察92个薄片来确定成岩元素，I' ¹³ Ç和I' ¹⁸ ö）。确定了八个不同的方解石胶结阶段和两个微晶微结构。作为一项主要结果，这项研究强调了这两个断层带起排水作用，使低温流体在开始时就形成了渠，并诱发了方解石胶结作用，从而强烈地改变和改变了局部储层的性质。