Study about the Sedimentary Microfacies of PH Fm.in X Oilfield--Taking FHT Area as an Example

Based on core data,grain size analysis and logging curve characteristics,study has been done on sedimentary microfacies types,microfacies characteristics and vertical distribution of the main reservoir of PH Fm.in FHT area of X Oilfield.The main microfacies types in this area are distributary channels,subaqueous distributary channels,mouth-bar,mixed flats,sand flats and tidal channels.The vertically distribution of different microfacies of the main reservoir has been made clear on the basis of stratigraphic classification.The lower part of PH Fm.reservoir is mainly tidal channel,mixed flat and sand flat sand bodies,and changing upward into subaqueous distributary channel and mouth-bar sand body.The top of PH Fm.reservoir is mainly distributary channel sand bodies,of which the tidal channel,subaqueous distributary channel and distributary channel sand bodies are the excellent quality reservoir in this area.