High-Resolution Study of Subsurface Geology using Core-Log Data Integration

2001年，东京大学海洋研究所引进了一套用于井下测井数据分析的软件包Geoframe。利用该软件处理了大洋钻探计划第186和196航次的测井资料。三陆外弧前盆地的电阻率地层扫描仪数据显示出清晰的泥岩和白云岩夹层图像。南海俯冲带滑脱层的196航次资料显示了断裂带复杂的孔隙结构网络，千叶县铫子200 m井的测井资料显示了孔隙度、自然伽马和电阻率的周期性变化。这种测井资料的周期性变化与过去400 K年的氧同位素变化相关。800年前前岩石学和测井资料的综合分析表明，黑潮--

In 2001, a software package for downhole logging data analysis called Geoframe was introduced to Ocean Research Institute, University of Tokyo. Using this software the logging data obtained through Ocean Drilling Program Leg 186 and 196 were processed. The resistivity formation scanner data from the forearc basin off Sanriku showed clear image of mudstone and dolomite intercalation. Leg 196 data at the decollement horizon of the Nankai subduction zone indicate complex network of porosity structure of the fault zone.Logging data obtained from 200m drilling at Choshi, Chiba Prefecture showed cyclic singles of porosity, natural gamma-ray and resistivity. Such cyclic variability of logging data was correlated with oxygen isotope variability for last 400K yr. ago to 800 yr. ago. Examination of both lithological data and logging data, it was possible to show that the Kuroshio-Oyashio fluctuation according to glacial and interglacial cycles was a cause for the physical property cyccles.This study demonstrated that combined analysis of samples and logging data produces a powerful tool for sedimentology and structural geology.