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Results
Summary Sensitivity of rocks properties responding to pore fluid and sensitivity of seismic attributes to a given lithology contrast are two important issues for defining a reservoir. This study attempts to quantitatively determine these sensitivities. The evaluation of the sensitivities was used to predict seismic response and amplitude variation with offset. It is demonstrated that the analysis of these sensitivities is useful for seismic interpretation and prospect evaluation. A methodology is suggested to evaluate these sensitivities by using absolute and relative variations of rock properties with respect to porosity, pore fluid and rock composition. It indicates that the orthogonality of rock properties with given a pair of lithologic units is a measure of lithologic contrast. It could be enhanced through mathematical manipulations.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.53)
Summary The application of amplitude versus offset (AVO) in carbonate reservoirs is re-examined based on the increasing knowledge in the physical properties of carbonate rocks and advances in AVO technologies. The rock physics analysis indicated that porosity plays the dominating role in influencing carbonate rock properties and suggests that gas effect may be determined. Using derived relations between velocities, porosity and gas effect, The amplitude vs. offset is calculated as a function of these effects in commonly encountered reservoirs. It is demonstrated that carbonate reservoirs have unique characteristics in amplitude variation with offset. This is compared with the AVO in clastic reservoirs. The carbonate rock properties, impedances and elastic modulii, are studied because of their direct link to pre-stack seismic inversion. Their relationships with porosity were used for predicting the porosity of carbonate reservoirs.
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.31)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.30)