The largest controlling factor of the remaining oil distribution is the sedimentary facies, but now the microfacies study cannot meet the demand of finding remaining oil at the enhanced oil recovery phase. With the detailed reservoir architectural analysis method, the braid river facies is divided into composite channel, single channel and floodplain, channel bar (core bar, top bar, sludge bed) and braid channel (abandoned channels, riverbed): four levels of architecture units, and the relationship between the architecuture units and the remaining oil distribution is predicted. Using the material balance method to calculate the remaining oil, the relationship between architecture units and remaining oil distribution is eventually verified, which is of great significance to enhance oil recovery.
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