We had analyzed the sedimentary facies of the Shiiya Age successions (6.0Ma to 3.5Ma), northern part of the Niigata oil fields, by using many seismic profiles and well logs. As a result, we could make clear following things: 1) the submarine fan at the Shiiya Age is a radial fan/point source type, 2) the source point is located around the Gosen City, and 3) the direction of sediments supply is from SE to NW.
