A 3D seismic survey was done on a near surface karstic reservoir located at the hydrogeological experimental site (HES) of the University of Poitiers (France). The processing of the 3D data led to obtaining a 3D velocity block in depth. The velocity block was converted in pseudo porosity. The resulting 3D seismic pseudo-porosity block reveals three high-porosity, presumably-water-productive layers, at depths of 30–40, 85–87 and 110–115 m. This paper shows how full wave acoustic logging (FWAL) can be used to validate the results obtained from the 3D seismic survey if the karstic body has a lateral extension over several seismic. If karstic bodies have a small extension, FWAL in open hole can be fruitfully used to: detect highly permeable bodies, thanks to measurements of acoustic energy and attenuation; detect the presence of karstic bodies characterized by a very strong attenuation of the different wave trains and a loss of continuity of acoustic sections; confirm the results obtained by vertical seismic profile (VSP) data. The field example also shows that acoustic attenuation of the total wavefield as well as conversion of downward-going P-wave in Stoneley waves observed on VSP data are strongly correlated with the presence of flow.

中文翻译：

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全波声波测井对岩溶体检测和预测的贡献

对位于普瓦捷大学（法国）水文地质试验场 (HES) 的近地表岩溶储层进行了 3D 地震勘测。3D 数据的处理导致获得深度的 3D 速度块。速度块被转换为伪孔隙度。由此产生的 3D 地震伪孔隙度块揭示了三个高孔隙度、可能是产水层，深度分别为 30-40、85-87 和 110-115 m。本文展示了如果岩溶体在多次地震中具有横向延伸，如何使用全波声波测井 (FWAL) 来验证从 3D 地震勘测中获得的结果。如果岩溶体的延伸很小，裸眼中的 FWAL 可以有效地用于： 探测高渗透体，这要归功于声能和衰减的测量；检测岩溶体的存在，其特征在于不同波列的非常强的衰减和声学部分的连续性损失；确认垂直地震剖面 (VSP) 数据获得的结果。现场示例还表明，在 VSP 数据上观察到的斯通利波中，总波场的声学衰减以及下行 P 波的转换与流动的存在密切相关。