The tight sandstone reservoirs in lower Shihezi formation from Daniudi Gasfield of Ordos Basin is
characterized by low-porosity,and the variation of geophysical characteristics followed by oil saturation and
gas saturation is weak relatively, therefore the identification of reservoir fluid is difficult in the area. In order
to solve the problem, we optimized gas-bearing sensitive elastic parameters based on rock physical
parameters testing. By using the relationship in parameters, we derived computation formula for fluid
sensitive elastic parameters and constructed a new gas-bearing identification factor. By utilizing the P-wave
and S-wave impedance simultaneous inversion result of prestack seismic data, the data volume of new
gas-bearing identification factor was computed and applied to the reservoir fluid detection in Daniudi
Gasfield. The application results indicate that the new gas-bearing identification factor can effectively
highlight the impact of fluid changes and is sensitive to the gas-bearing tight sandstone reservoirs with good
anti-noise capability.
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