A collection of 81 plugs were obtained from the Humilly-2 borehole (France), that reached the Permo-Carboniferous sediments at a depth of 3051 m. Experimental measurements of physical parameters and mineralogical analysis were performed to explore the links between sedimentary facies and seismic characteristics and provide a key tool in the interpretation of seismic field data in terms of geological formations. The plugs, cylinders of 22.5 mm in diameter and $$\sim$$ 30 mm in length were collected parallel and perpendicular to the bedding in order to explore their anisotropy. Ultrasound wave propagation was measured at increasing confining pressure conditions up to 260 MPa, a pressure where all micro-fractures are considered closed. The derivatives of velocities with pressure were established, allowing the simulation of lithological transitions at in-situ conditions. At room conditions, measured grain densities (kg/m3) range from 2630 to 2948 and velocities vary from 4339 to 6771 and 2460 to 3975 $${\text {m/s}}$$ for P- and S-waves propagation modes, respectively. The largest seismic-reflections coefficients were calculated for the interface between the evaporitic facies of the Keuper (Lettenkohle) and the underlying Muschelkalk carbonates (R $$_{\text {c}}=$$ 0.3). The effective porosity has the range of 0.23% to 16.65%, while the maximum fluid permeability $$\left( \text {m}^{\text {2}}\right)$$ is 9.1 $$\times \text {10}^{-{\text {16}}}$$ . A positive correlation between porosity and ultrasound velocity has been observed for P- and S-waves. The link between velocities and modal content of quartz, dolomite, calcite, and micas has been explored. This paper presents a unique set of seismic parameters potentially useful for the calibration of seismic data in the Geneva Molasse Basin.

中文翻译：

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瑞士莫拉西盆地西部地震数据校准的实验室方法：日内瓦地区Humilly-2井（法国）的案例

从Humilly-2钻孔（法国）获得了81个塞子，这些塞子到达了3051 m深度的Permo-Carboniferous沉积物。进行了物理参数和矿物学分析的实验测量，以探索沉积相与地震特征之间的联系，并为根据地质构造解释地震场数据提供了关键工具。平行于和垂直于垫层收集直径为22.5毫米，长度为30毫米的圆柱体，以探究其各向异性。在最高260 MPa的封闭压力条件下测量超声波传播，在该压力下所有微裂纹均被视为闭合状态。建立了压力的速度导数，可以在原位条件下模拟岩性转变。在室温条件下，测得的颗粒密度（kg / m3）为2630至2948，速度从4339至6771和2460至3975 $$ {\ text {m / s}} $$对于P和S波传播模式， 分别。计算了库珀（Lettenkohle）的蒸发相与下伏的Muschelkalk碳酸盐（R $$ _ {\ text {c}} = $$ 0.3）之间的界面的最大地震反射系数。有效孔隙率的范围为0.23％至16.65％，而最大流体渗透率$$ \ left（\ text {m} ^ {\ text {2}} \ right）$$为9.1 $$ \ times \ text { 10} ^ {-{\ text {16}}} $$。对于P波和S波，已经观察到孔隙率和超声速度之间存在正相关。速度与石英，白云石，方解石，和云母已被探索。本文介绍了一组独特的地震参数，这些参数可能对校准日内瓦莫拉塞盆地的地震数据有用。