Shazam層序学をボーリングデータベース解析へ適用する試み

―大阪平野の表層地質研究を例に―

抄録

 We propose Shazam stratigraphy as a new analytical method based on facies analysis and sequence stratigraphy. This method is applied to a recently developed borehole database and subsurface geology in the Osaka Plain. Using the method, the shapes of lithofacies boundaries in subsurface sections are optimized for sedimentary faces and changes. The optimized boundary allows interpretation of seismic sections. The result is better recognition and reconstruction of depositional systems, geomorphological evolution, and tectonics. Irregular sequence boundaries, flat transgressive ravinement surfaces, and sawtooth downlap surfaces of the prograding depositional system are key boundaries for this method.