Fluid Discrimination Based on Frequency-Dependent AVO Inversion with the Elastic Parameter Sensitivity Analysis

Figure 1

Dispersion analysis of different elastic parameters. SH indicates shale content, corresponds to sandstone reservoir and corresponds to shale reservoir; SG indicates gas saturation in gas-water mixed fluid and SO indicates oil saturation in oil-water mixed fluid; , , , , and indicate the bulk modulus, shear modulus, P-wave modulus, Lamé parameter, and Russell fluid factor, respectively; the value of is given as 2.3. (a) Gas-bearing shale reservoir; (b) oil-bearing shale reservoir; (c) gas-bearing sandstone reservoir; (d) oil-bearing sandstone reservoir.

(a)

(b)

(c)

(d)