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Summary The goals of this study are to characterize and understand the elastic properties of the Z Sandstone and to determine if discrimination of pore fluids is possible in order to support the ongoing exploration drilling program. This type of analysis is quite challenging considering that the reservoir in the study area, located onshore in the Eastern Province of Saudi Arabia, is present at depths exceeding 5,000 meters. At these depths it is unusual to have detectable amplitude variation with offset (AVO) behavior. Different log-derived attributes are analyzed to study the overall elastic behavior of the reservoir and to determine the most effective combinations of attributes to use in discriminating the hydrocarbon charged sands from the wet sands. The Z Sandstone is characterized as a Class IV AVO reservoir where the shale-sand interface has a negative reflectivity that decreases in intensity with increasing offset or angle. A simultaneous amplitude variation with angle (AVA) inversion is performed to try to detect, and map, the extent of the hydrocarbon charged sands within the study area. It was found that under certain conditions, the hydrocarbon bearing reservoir sands could be detected. |
