Porous sandstones are important reservoirs for geofluids. Interaction therein between deformation and cementation during diagenesis is critical since both processes can strongly reduce rock porosity and permeability, deteriorating reservoir quality. Deformation bands and fault-related diagenetic bodies, here called “structural and diagenetic heterogeneities”, affect fluid flow at a range of scales and potentially lead to reservoir compartmentalization, influencing flow buffering and sealing during the production of geofluids. We present two field-based studies from Loiano (northern Apennines, Italy) and Bollène (Provence, France) that elucidate the structural control exerted by deformation bands on fluid flow and diagenesis recorded by calcite nodules associated with the bands. We relied on careful in situ observations through geo-photography, string mapping, and unmanned aerial vehicle (UAV) photography integrated with optical, scanning electron and cathodoluminescence microscopy, and stable isotope (δ¹³C and δ¹⁸O) analysis of nodules cement. In both case studies, one or more sets of deformation bands precede and control selective cement precipitation. Cement texture, cathodoluminescence patterns, and their isotopic composition suggest precipitation from meteoric fluids. In Loiano, deformation bands acted as low-permeability baffles to fluid flow and promoted selective cement precipitation. In Bollène, clusters of deformation bands restricted fluid flow and focused diagenesis to parallel-to-band compartments. Our work shows that deformation bands control flow patterns within a porous sandstone reservoir and this, in turn, affects how diagenetic heterogeneities are distributed within the porous rocks. This information is invaluable to assess the uncertainties in reservoir petrophysical properties, especially where structural and diagenetic heterogeneities are below seismic resolution.

中文翻译：

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流体流动和浅成岩作用的结构控制：方解石胶结作用沿多孔砂岩变形带的启示

多孔砂岩是地质流体的重要储层。在成岩过程中，变形和胶结作用之间的相互作用至关重要，因为这两个过程都可以大大降低岩石的孔隙度和渗透率，从而降低储层质量。形变带和与断层有关的成岩体（这里称为“结构和成岩异质性”）在一定范围内影响流体流动，并有可能导致储层分隔，从而影响土流生产过程中的缓冲和密封。我们介绍了来自Loiano（北亚平宁山脉，意大利）和Bollène（法国普罗旺斯）的两项基于现场的研究，阐明了变形带对方解石结节所记录的流体流动和成岩作用的控制作用。我们依赖于通过地理摄影进行的仔细的原位观察，δ ¹³ C和 δ ¹⁸O）结核水泥的分析。在两个案例研究中，一组或多组变形带先于并控制了选择性水泥的沉淀。水泥质地，阴极发光模式及其同位素组成表明从陨石中析出。在洛亚诺，变形带对流体流动起着低渗透性的作用，并促进了水泥的选择性沉淀。在Bollène，形变带簇限制了流体流动，并将成岩作用集中于带状平行带。我们的工作表明，变形带控制着多孔砂岩储层内的流型，进而影响了成岩非均质性在多孔岩中的分布方式。这些信息对于评估储层岩石物性的不确定性非常宝贵，