新津油田，金津層一ノ沢セクションにおける重力流堆積物の露頭スケールの岩相多様性と貯留層不均一性

抄録

This study exhibits a detailed lithologic description of the outcrops along the 79.95 m-thick Ichino-sawa section of the Late Miocene-Early Pliocene Kanatsu Formation, the main reservoir horizon of the Niitsu Oilfield, Niigata, Japan. A total of six facies types of sediment gravity flow deposits were identified. A preliminary pore-throat radius analysis was also conducted on 13 samples from four sandstone beds. These revealed distinctive vertical variations of variable scales in both lithology and porosity in this lower slope setting of a channel-levee complex. The sedimentation processes of the sandstone beds are discussed, suggesting that reservoir quality（porosity and thickness）is strongly controlled by the flow conditions immediately prior to the deposition. Comparison with deep-sea sediments in other areas within and outside the Niigata Basin is also shown. The methods used in this case study can be useful in creating a template for predicting reservoir quality in relatively new fields.