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Collaborating Authors
Results
Summary The onset time, the time at which a geophysical observation begins to change from its background value, is a very useful attribute for reservoir characterization. In particular, the onset time has a robust relationship to flow and flow properties in the reservoir even in the presence of uncertainty as to which rock physics model is appropriate. We illustrate this by a numerical simulation involving the monitoring of injected carbon dioxide.
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Time-Lapse Surveying > Time-Lapse Seismic Surveying (0.67)
Summary We present a novel and efficient methodology to assess the performance of new permanent sensor designs intended for land reservoir monitoring. This is essential to pave the way for permanent installation of 1000 4C sensors over a CO2 injection site. This methodology focuses on evaluating the performance of geophones and hydrophones deployed above and below the water table. It allows us to obtain what we think is a reliable estimate of signal-to-noise and short-term repeatability using pre-stack data obtained with both individual sensors (hydrophones and geophones) as well with so-called dual sensor (summed geophone and hydrophone). We present several field case studies using various configurations and sensor types from different manufacturers.
Summary We present a novel inversion scheme for decomposing upgoing and downgoing wavefields from vertical particle velocity recordings in downhole arrays at multiple depth levels. Our method requires no knowledge of the subsurface medium parameters as the required operators are obtained directly from the data by direct-wave interferometry. As we demonstrate, the method can be applied with as few as two receiver arrays, as long as their vertical spacing is sufficiently small. Additional depth levels can be used to improve the stability of the inversion.
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (0.48)
- Geophysics > Seismic Surveying > Seismic Processing (0.47)
Summary We describe a seismic monitoring system designed for a desert environment with complex near surface. The goal is to map CO2 injection using permanent buried sensors at shallow depths of 50-70 m. This is the first large-scale permanent seismic installation in Saudi Arabia deployed at such depth and we face a number of geophysical and operational challenges. These challenges were overcome through a series of focused collaborations with service providers and speedy field trials aimed to validate each new element of the installation. We highlight key achievements related to sensor design and deployment, drilling and 4D source effort. All components are validated using pre-stack data repeatability metrics on field pilot tests.
- Asia > Middle East > Saudi Arabia (0.49)
- Europe > United Kingdom > North Sea > Central North Sea (0.24)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Four-dimensional and four-component seismic (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Seismic (four dimensional) monitoring (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > Middle East Government > Saudi Arabia Government (0.33)