Integrated geophysical analysis using different methods along with a priori information from wells, is a proven approach to investigate the geology and the petro-physical characteristics of subsoil. We collected seismic and geoelectric data in an area located on the Adriatic coast in North-Eastern Italy, aimed at characterizing the quaternary sediments and the shallow geological structures. Compressional and shear-wave data provided information about geometry and velocity of the quaternary sedimentary succession, while geoelectric data provided information about the resistivity in the shallower formation, which strongly depends on the presence of groundwater (brine) and on its salinity. Clustering analysis allowed us to subdivide the study area into subdomains showing similar values of resistivity and compressional- and shear-wave velocity, enabling for a better interpretation of the processed seismic sections. Then, we calculated the petro-physical properties of the investigated sediments, i.e., brine saturation and resistivity, porosity, and clay content, for each cluster. This inverse problem involves rock-physics theories and an optimization algorithm based on the simulated annealing global-search method. The results, validated using borehole stratigraphy, provided information about the salty water wedge intrusion.

使用不同方法的综合地球物理分析以及来自井的先验信息，是研究底土的地质和岩石物理特征的行之有效的方法。我们在意大利东北部亚得里亚海沿岸的一个地区收集了地震和地电数据，旨在描述第四纪沉积物和浅层地质结构的特征。压缩波和剪切波数据提供了有关第四纪沉积层序的几何形状和速度的信息，而地电数据提供了有关较浅地层电阻率的信息，这在很大程度上取决于地下水（盐水）的存在及其盐度。聚类分析使我们能够将研究区域细分为显示电阻率和压缩波和剪切波速度相似值的子域，能够更好地解释处理后的地震剖面。然后，我们计算了所研究沉积物的岩石物理特性，即每个簇的盐水饱和度和电阻率、孔隙度和粘土含量。该反演问题涉及岩石物理理论和基于模拟退火全局搜索法的优化算法。使用钻孔地层学验证的结果提供了有关咸水楔侵入的信息。