Petrophysical properties of cylindrical core specimens from three boreholes from the International Continental Scientific Drilling Program, the DSeis project, measured at ambient pressure and room temperature conditions in various laboratories are presented and compared with downhole petrophysical data (sonic and density). The measured properties are from sixty-six rock specimens constituting metasediments, metabasalts and intrusives. Seismic velocities were measured using 0.5 MHz P- and S-wave transducers. To investigate the source of seismic reflectivity observed on the 2D legacy seismic data, we computed synthetic seismograms for adjacent rock units using downhole petrophysical data and compared them with seismic reflections from the reflection seismic profile. The experimental measurements show that the metasediments exhibit lower bulk densities and seismic velocities than the metabasalts and intrusive specimens. The porosity was found to be less than 2% for all the samples. No clear trends emerge when the Poisson's ratio is plotted against the P-wave velocities and porosities of the samples. A positive relationship is observed between the bulk modulus and P-wave velocities of the rock samples. The highest calculated reflection coefficients (RC) are associated with the metasediment-intrusive interfaces in all three boreholes. The intrusive-metabasalt and the metasediment-metabasalt interfaces exhibit low RC. Synthetic seismograms reveal strong reflections that coincide with high RC calculated using the bulk density and velocity data. The synthetic seismograms also revealed additional strong reflections that were not identified using the reflection coefficients calculated from the rock specimens, due to core loss in some lithological units. Successful correlations are carried out between the synthetic seismic data and the real seismic data, enabling us to correlate the stratigraphic sequence drilled in the boreholes to the seismic reflections observed on the legacy 2D reflection seismic data.

介绍了来自国际大陆科学钻探计划（DSeis 项目）的三个钻孔的圆柱形岩心样品的岩石物理特性，这些样品是在各个实验室的环境压力和室温条件下测量的，并与井下岩石物理数据（声波和密度）进行了比较。测量的性质来自 66 个岩石标本，这些标本包括变质沉积物、变玄武岩和侵入体。使用 0.5 MHz P 和 S 波传感器测量地震速度。为了研究在二维传统地震数据上观察到的地震反射率的来源，我们使用井下岩石物理数据计算了相邻岩石单元的合成地震图，并将它们与反射地震剖面的地震反射进行了比较。实验测量表明，变质沉积物的体积密度和地震速度低于变玄武岩和侵入体样品。发现所有样品的孔隙率均小于 2%。当泊松比与样品的 P 波速度和孔隙度作图时，没有出现明显的趋势。在岩石样品的体积模量和 P 波速度之间观察到正相关关系。计算得到的最高反射系数 (RC) 与所有三个钻孔中的变质沉积物侵入界面有关。侵入变玄武岩和变质沉积变玄武岩界面表现出低RC。合成地震图显示强烈的反射与使用体积密度和速度数据计算的高 RC 一致。由于某些岩性单元中的岩心损失，合成地震图还显示了额外的强反射，这些反射无法使用从岩石样本计算的反射系数来识别。在合成地震数据和真实地震数据之间进行了成功的关联，使我们能够将钻孔中的地层序列与在传统二维反射地震数据上观察到的地震反射相关联。