SEDIMENTARY CHARACTERISTICS OF THE SLOPE FAN IN THE SLOPE BREAK IN THE SOUTHERN SAG OF THE ULIASTAI DEPRESSION, INNER MONGOLIA

Slope fan sediment is of a kind of the gravity flows. It is also developed in continental fault basins. Some conglomerate bodies with heavy thickness, coarse grains and quickly changed facies occur in the slope break of the First Member of Tenger Formation in Uliastai Sag, Erlian Basin, Inner Mongolia. However, there is still much controversy about the exact origin of the conglomerate bodies and bewilderment about the size, spatial distribution, reservoir characteristics and formational model of oil pools. Based on the examination of cores, well logs, 3D seismic and petrographic data, it is concluded that the conglomerate bodies belong to slope fan formed by sediment gravity flow in the low-stand systems. With classifi cation of the slope fan in the studied area, the planar distribution of the slope fan deposits is analyzed. A sedimentary facies model of the studied area is set up. This research will be helpful to further exploration in lithologic oil pools in the area.