Abstract：5 mid-term and 16 short-term cycles are recognized from Fuyu oil beds in the study area, and a high-frequency isochronal stratigraphic framework and well-to-seismic framework are also built by horizon calibration and sub-bed correlation. On this basis, this paper analyzes log facies mode and sedimentary facies of each short-term cycle under the high-frequency isochronal stratigraphic framework in the area. It can be assumed that the sedimentary facies belongs to a river type between classical meandering rivers and anastomosing rivers. Then a phase-controlled sand shale model is also built under the high-frequency isochronal stratigraphic framework. A phase-controlled inversion on model-constrained prestack seismic data is carried out and reservoirs are predicted on results of phase-controlled prestack inversions. Tight sandstone reservoir seismic identification based on isochronal phase-controlled inversions is formed, which is very helpful for superposed sand body prediction in the area. Inversion sections show clear sandstone with the thickness more than 2m in posterior wells and sandstone responses with the thickness between 1~2m.
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