In the 1950s, a petroleum well in Soultz-sous-Forêts (no 4589; Upper Rhine Graben, France) reached the Lettenkohle (Triassic) at 830 m depth. During the exploration phase at Soultz-sous-Forêts, the first enhanced geothermal system pilot project in the world, the well was core-deepened up to 2227 m into the granitic basement (then renamed EPS-1). The objectives of this deeper well were (i) to explore the granitic fractured reservoir and (ii) provide a precise geological characterization of the Soultz-sous-Forêts horst. This paper presents the first complete core analysis of the sedimentary formations observed in the EPS-1 cores (from the middle Muschelkalk to the Permian) in conjunction with the gamma-ray log description and field works. The detailed descriptions of the geological formations encountered in the well are presented with photo boards displaying the most characteristic facies of each formation, since the wells are rarely cored, especially in the Muschelkalk. This study also aims to describe the gamma-ray log to provide a strong baseline for future geothermal well exploration in this area (or old well reinterpretations). At this time, it is the only available reference for the complete section: Muschelkalk to Permian sedimentary formations.

中文翻译：

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使用EPS-1勘探地热钻孔（Soultz-sous-Forêts，法国上莱茵格拉本）的岩心和伽玛射线对中下三叠统和二叠纪地层进行详细描述

在1950年代，位于Soultz-sous-Forêts的一口油井（编号4589；法国上莱茵格拉本）在830 m的深度到达了Lettenkohle（三叠纪）。在世界上第一个增强的地热系统试点项目Soultz-sous-Forêts的勘探阶段，该井被岩心深深地钻进了花岗岩基底中2227 m（然后更名为EPS-1）。这口深井的目标是（i）探索花岗岩裂缝性储层，以及（ii）提供Soultz-sous-Forêts霍斯特的精确地质特征。本文结合伽马射线测井描述和现场工作，对EPS-1岩心（从中部Muschelkalk到二叠纪）中观察到的沉积岩层进行了首次完整岩心分析。井中遇到的地质构造的详细描述都用照相板展示，这些照片板显示了每种构造的最具特征性的相，因为这些井很少是岩心，特别是在Muschelkalk中。这项研究还旨在描述伽马射线测井，以为该地区将来的地热井勘探（或对旧井进行重新解释）提供强有力的基准。目前，它是完整部分的唯一可用参考：Muschelkalk至二叠纪沉积岩层。