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Fourth EAGE Workshop on Rock Physics
- Conference date: November 11-13, 2017
- Location: Abu Dhabi, United Arab Emirates
- Published: 11 November 2017
21 - 25 of 25 results
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Rock Physics Modelling and Applications for better integrating Seismic Properties into Reservoir Models
Authors G. Carrasquero and M. FervariSummaryRobustness of reservoir models rely on the proper integration of all available subsurface data: petrophysical, sedimentological, engineering and geophysical. While the first three disciplines are generally taken into account in every model building workflow, seismically derived properties are not always used as input information for conditioning reservoir properties distribution. Nowadays however, with the increasing complexity of the fields that must be technically assessed, quantitative seismic reservoir characterisation studies have been more requested as input into models.
Regardless the reservoir modelling approach used, the rock physics discipline represents the key link between the seismic information and the subsurface properties. The integration of “elastic” data (P- and S-sonic, Density) provides a quantitative link between rock properties, which can be propagated in reservoir models by using seismic products derived from proper calibration (forward and/or inverse modelling).
The aim of this paper is to expose our vision through practical examples in which rock physics has proven to be the key to unlock the full potential of seismic information in terms of reservoir characterisation and, therefore, input for properly driving reservoir models. Given the wide range of uses, we will try to give some sneak peeks of two main aspects: (1) modelling and (2) applications.
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Study on the Effect of Pressure in Crack Density of Carbonate Rocks
More LessSummaryIf there is any question, please feel free to contact us
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Using Nmr T2 to Predict the Drainage Capillary Curves (Pc- Sw) in Carbonates Reservoirs
By R. OriyomiSummaryThis research work predicts capillary pressure curves at primary drainage from the transverse T2 relaxation times of the NMR pore size distributions with ninety percent accuracy which could do the trick in reservoir applications. The capillary pressure-water saturation curves are important instructions to reservoir simulators for predicting the dynamic properties of the reservoir as well the fluid saturations at different depths. This study was originated from the challenges in forecasting the initial saturations from an NMR logged well. The procedure is a simple and non-damaging construction of capillary pressure curves from plug samples measurements.
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Multi-Scale Reservoir Characterization of Tight Gas Sand: A Case Study from the Paleozoic Glaciogenic Sarah Formation, Rub’ Al-Khali Basin, Saudi Arabia
By A. AlqubaleeSummaryThis study integrates core description, thin section, X-ray diffraction, Scanning Electron Microscopy, porosity and permeability measurements to characterized the Late Ordovician Sarah Formation in Rub’ Al-Khali Basin, Saudi Arabia. Core samples retrieved from six exploratory wells drilled in this basin were used for this study. The Formation is one of the Palaeozoic siliciclastic sequences targeted for unconventional tight gas in the Kingdom of Saudi Arabia. However, the heterogeneity within the Formation’s lithofacies, depositional environments and deep burial were revealed as major challenges for gas exploration and development activities, particularly, in the studied basin.
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Study on the Effect of Fluids in Acoustic Frequency Response of Carbonate Rock Samples
More LessSummaryCarbonate formations constitute more than 50% of the global hydrocarbon reserves and great amount of aquifers. Carbonate systems exhibits complexities where many challenges face geophysicists and geologists when attempting to define carbonate formations from seismic data. Part of these challenges are related to the interaction between the pore fluid and rock constituents which affected the elastic properties of a rock. On the other hand, seismic is one of the methods that have been widely utilized in the petroleum industry and engineering investigations as it plays a major role in mapping subsurface geology and structures. However, the relation between acoustic frequency and rock properties is still not well understood. The present project attempts to investigate the effect of fluids (oil and water) in the acoustic frequency response in four carbonate samples. The accomplishment of this objective will assist to understand in a small scale the effect of fluids in rocks to latter be applied in the interpretation of field scale formation. In an approach to determine both shear and compressional waves through each core sample at dry and fully saturated conditions, a simple circuit have been assembled including acoustic transducers, oscilloscope and pulser-recevier. To measure the compressional wave (P-wave) a pair of 1 MHz transducers have been used whereas for the two perpendicular shear waves (S1 and S2 waves) two pairs of 0.5 MHz transducers were utilized. The waveforms attained were processed in MATLAB software to evaluate the frequency response for each core sample at different conditions (dry, full water saturation and full oil saturation) by applying the Fast Fourier Transform (FFT) principle. In addition, the corresponding travel times in each sample and condition were measured.
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