Abstract:

The glutenites reserve abundant heavy oil in the Luojia and Kenxi areas,Jiyang depression. But their reservoir capabilities, oil saturation and fluid kinematical characters during exploitation have much discrepancy. By analyzing drilling, logging and kinds of analytical data in detail, their sedimentological characteristics are studied. Facies of Luojia glutenites has been disputed as nearshore subaqueous fan, subaqueous alluvial fan and fan delta facies by some scholars. But combined many factors, they should be of subaqueous alluvial fan which developed on steep flat slope.Facies of Kenxi glutenites always are classified as subaqueous alluvial fan due to no onshore sediment. According to their sedimentological characteristics, they are of special fan delta which comprises of rooting subaqueous alluvial bodies subfacies,fan delta leading edge subfacies and fore fan delta subfacies. By comparing, the two facies are different in many aspects such as sedimentary backgrounds, sedimentary dynamic settings and sedimentary characters including lithofacies, rock textures, sedimentary structures and facies sequences. They have different sedimentary models. This study provids important information for explorating advantageous microfaciesreservoirs and selecting waterflooding programs during glutenites heavy oil exploration and exploitation.

Key words: Jiyang depression, glutenite, fan delta, subaqueous alluvial fan, sedimentology