Sonic log data extracted from exploration wells in the ViDEPI project (offshore the Apulia, southern Italy)

Twelve files have been obtained after the extraction of data from raster images (PDF format) of as many sonic log graphs of exploration wells. The files data refer to the exploration wells located in the Adriatic Sea offshore the Apulia, whose raster images of sonic logs are public within the ViDEPI Project (www.videpi.com) of the Ministry for the Economic Development of the Italian Government. Each file is composed of two columns of data A and B, that are interval transit time Δt [µs/ft] and depth [m], respectively. Therefore, a total of 18396 pairs of Δt-depth data have been extracted. The pair of Δt-depth values resulted in CSV file format for the sonic logs of each of the following exploration wells: Branzino-1, Chiara-1, Cristina-1, Famoso-1, Giove-1, Giove-2, Grazia-1, Grifone-1, Medusa-1, Sabrina-1, Simona-1, and Sparviero-1bis. As known, the sonic log is a Δt-depth diagram, where Δt is the interval transit time; the unit of measurement of Δt is µs/ft (µs = microseconds, ft = feet), and that of the depth is m (m = meters). For the interpretation of the seismic profiles, it is important to distinguish the net variations of Δt, that are related to sudden variations of acoustic impedance, which in turn depends by lithostratigraphic features. It is worth mentioning that for each lithostratigraphic succession the calculation of the (i) average interval transit time easily allows the obtaining of the (ii) seismic P-waves average velocity: the latter is the reverse of the first. The unit of measurement of seismic P-waves average velocity, which is thus ft/µs, can be converted in m/s (m = meters, s = seconds), taking into account that µs = 10-6 s, and ft = 0.3048 m. The data are important for geologists who interpret the reflection seismic profiles located in the Adriatic Sea, chiefly offshore the Apulia; the interpreters of the seismic profiles placed in the adjacent offshore areas, i.e., the Ionian Sea, can benefit from the data making appropriate correlations. Furthermore, the data can be helpful also for seismological purposes around the Apulia.

从12口勘探井的声波测井曲线图光栅图像（PDF格式）中提取数据后，共获得12个数据文件。这些数据文件对应坐落于普利亚近海亚得里亚海的勘探井，其声波测井光栅图像已在意大利经济发展部主管的ViDEPI项目（www.videpi.com）中公开。每个文件均包含A、B两列数据，分别为声波时差（interval transit time）Δt [µs/ft]与深度[m]。综上，本次共提取获得18396组Δt-深度数据对。各勘探井的声波测井Δt-深度数据均以逗号分隔值（Comma-Separated Values，CSV）文件格式存储，涉及的勘探井依次为：Branzino-1、Chiara-1、Cristina-1、Famoso-1、Giove-1、Giove-2、Grazia-1、Grifone-1、Medusa-1、Sabrina-1、Simona-1以及Sparviero-1bis。众所周知，声波测井为Δt-深度关系图，其中Δt即为声波时差；Δt的计量单位为µs/ft（其中µs指微秒，ft指英尺），深度的计量单位为米（m）。值得说明的是，针对每一套岩石地层序列，通过计算（i）平均声波时差，可便捷求得（ii）地震P波平均速度：后者为前者的倒数。地震P波平均速度的计量单位为ft/µs，可通过单位换算得到以米/秒（m/s）为单位的数值，换算依据为1 µs = 10^-6 s，1 ft = 0.3048 m。本数据集对于解释亚得里亚海（主要为普利亚近海区域）反射地震剖面的地质人员具有重要应用价值；身处邻近近海区域（即爱奥尼亚海）的地震剖面解释人员，亦可通过合理关联，从本数据中获取有益参考。此外，本数据集亦可服务于普利亚周边的地震学研究工作。