The reservoirs of the 3

rd

member of the Permian Lower Shihezi Formation(P

1

h

3

) in the Daniudi gas field in the Ordos Basin are typical fluvial deposits.As reservoir prediction with seismic attributes is constrained by seismic resolution

uncertainty occurs in the prediction of channel sandstone reservoirs.High-resolution sequence stratigraphy is applied in this paper to figure out the distribution pattern of sedimentary facies of the targets in P

1

h

3

.It has been made clear that the seismic reflector on the top of P

1

h

3

(T

9

f

) has the geologic significance of an approximate isochronous surface in the whole study area.The relationship between the thickness of the upper sandstone interval in P

1

h

3

and the average amplitude of T

9

f

conforms to the principle of tuning amplitude.Thus

the amplitude attributes that are sensitive to the sandstone in the P

1

h

3

are optimized.According to integrated analyses of seismic facies

logging facies and sedimentary microfacies

it is thought that the plan view of sensitive amplitude attribute of P

1

h

3

is consistent with the distribution pattern of sedimentary facies.Favorable zones for sandstone development could be predicted through relevant analysis.Application in area near the D66 well shows that 90% of the prediction matches the real drilling results.Therefore

under the constraints of sedimentary microfacies and sedimentary characteristics

seismic attributions can be used to accurately predict and characterize complex reservoirs.