抄録
The purpose of the present work is to make a mechanical purification of the cutting samples for detailed chemical and physical investigations of them. 289 cutting samples from Ôguchi exploratory well, R8, in the Nagaoka Basin, Niigata Prefecture were classified according to mechanical analysis, and considerations were made based on histograms, cumulative curves and triangular diagrams drawn on the basis of the size fractions, 8 mesh, 8-9 mesh, 9-16 mesh, and the remainders of the respective samples. The other hand, extractable organic constituents of the 36 specimens selected from these 289 samples were determined.
