In-situ δ¹⁸O measured in the quartz overgrowths help identify temperature and fluid origin variations responsible for cementation of the pore network (matrix and fracture) in the Buntsandstein Gp. sandstone reservoirs within the Upper Rhine Graben. The overgrowths record two types of the evolution of δ¹⁸O: 1) a monotonous decrease of the δ¹⁸O_overgrowth interpreted as linked to an increasing burial temperature and 2) random fluctuations, interpreted as pointing out the injection of allochthonous fluids in faulted areas, on the cementation processes of the pore network (both intergranular and fracture planes). Fluids causing the quartz cementation are either autochthonous buffered in ¹⁸O from clay illitisation; or allochthonous fluids of meteoric origin with δ¹⁸O below − 5%. These allochthonous fluids are in thermal disequilibrium with the host sandstone. The measured signal of δ¹⁸O_overgrowth measured from samples and calculated curves testing hypothetic δ¹⁸O_fluid are compared to T–t evolution during burial. This modelling proposes the initiation of quartz cementation during the Jurassic and is validated by the in-situ ⁴⁰Ar/³⁹Ar dating results obtained on the feldspar overgrowths predating quartz overgrowths. A similar diagenetic history is recorded on the graben shoulders and in the buried parts of the basin. Here, the beginning of the pore network cementation predates the structuration in blocks of the basin before the Cenozoic graben opening.

在石英过度生长中测量的原位 δ ¹⁸ O 有助于确定导致 Buntsandstein Gp 中孔隙网络（基质和裂缝）胶结的温度和流体起源变化。上莱茵地堑内的砂岩储层。过度生长记录了 δ ¹⁸ O演化的两种类型：1) δ ¹⁸ O_过度生长单调减少，解释为与埋藏温度升高有关；2) 随机波动，解释为指出在断层区注入了外来流体, 关于孔隙网络的胶结过程（粒间面和断裂面）。引起石英胶结的流体要么在¹⁸O 来自粘土化；或 δ ¹⁸ O 低于 - 5%的陨石来源的外来流体。这些外来流体与主体砂岩处于热不平衡状态。将从样品测量的 δ ¹⁸ O_过度生长的测量信号和测试假设 δ ¹⁸ O_流体的计算曲线与埋藏期间的 T-t 演化进行比较。该模型提出了侏罗纪石英胶结的开始，并通过原位⁴⁰ Ar/ ³⁹对早于石英过度生长的长石过度生长获得的 Ar 测年结果。类似的成岩历史记录在地堑肩部和盆地的埋藏部分。在这里，孔隙网络胶结的开始早于新生代地堑打开之前盆地块体的构造。