Natsukawaishi and Nishiyama oil field

－A story about Japanese petroleum exploration in the past（part 5）

Abstract

The writer presents an outline of the paper, which is entitled “Natsukawaishi” and Nishiyama oil field and written by Ikebe （1955）, and examines the migration and accumulation of crude oils in the Nishiyama field using new geological and geochemical data. The deeper part of this field is probably the remnant exploration target because of poor structural control and the possibility of tight oils.