Hampson russell avo modeling azimuthal plus#
The seismic amplitude responses are affected by the type of rocks present, the degree of consolidation, the saturating fluids plus rock properties such as porosity of the reservoir and the encasing layers. Introduction The goal of this study is to distinguish between the effects of hydrocarbon and water in carbonate reservoirs by analyzing the AVO in seismic data over onshore carbonates reservoirs.
The effects of key reservoir properties on AVO response were examined to help establish interpretation guidelines and better understand the potential for misinterpretation. An AVO case study was performed using available relative amplitude CMP gathers along a 2D seismic line extracted from a 3D seismic volume. These encouraging AVO results on synthetic data suggest that with good quality seismic data it might be possible to see a difference in AVO response between brine and hydrocarbon filled porous reservoir. The AVO results on the synthetic CDP gathers suggests that brine can be discriminated from hydrocarbon. The responses for all three fluids were found to be a Class-4 type AVO. The modeled brine, oil and gas logs were used to calculate the AVO responses at the top and base of the reservoir layer using the Zoeppritz equations. Gassmann fluid substitution was used to model the available well log data, which included compressional and shear sonic logs and density logs to produce synthetic well logs representing the reservoir at 100% fluid saturations of brine, oil and gas at reservoir pressure and temperature conditions. Ībstract A seismic Amplitude Variation with Offset (AVO) feasibility study was successfully conducted to investigate the potential for fluid discrimination in a high porosity carbonate reservoir from a producing oil field in the Middle East. luids in the reservoir, density and bulk modus for eachįluid type were calculated. Outputs from the fluid substitution modeling are new values for bulk modulus and density, whichįor the. Modeling the seismic response to different pore fluids requires performing fluid substitution using the ix and the pore fluids and the water
Incidence, as well as on the material properti. The reflection and transmission coefficients depend on the angle of
As a consequence, the reflection coefficient at an interface becomes a function of the P-wave velocity, S-wave velocity and density. Now geophysicists routinely discuss the AVO.dary at none zero incidence angles, the conversion of P to S Parameters as we transmit and receive acoustic signals. itude Variation versus Offset or Amplitude Variation with Offset (AVO) is controlled by the various rock physics The seismic amplitude responses are affected by the type of roc. In AVO response between brine and hydrocarbon filled porou.nguish between the effects of hydrocarbon and water in carbonate reservoirs by analyzing theĪVO in seismic data over onshore carbonates reservoirs. TheseĮncouraging AVO results on synthetic data suggest that with good quality seismic data it might be possible to see a difference A Modeling Feasibility Study Indicates Seismic AVO has Potential toĭiscriminate between Brine and Hydrocarbon.ed from hydrocarbon.
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