CGG GeoConsulting utilizes a variety of different seismic inversion techniques. The appropriate technique is determined by the complexity of the geologic conditions, the customer’s reservoir characterization goals and the data available. Feasibility studies centered at a well location give us insight into which inversion methodology will best show a reliable separation of the target lithofacies and model the appropriate reservoir thicknesses.
We have significant expertise performing true 3D multi-channel, layer-based stratigraphic inversions. Our inversion schemes are particularly effective in poor signal to noise ratio areas. Seismic inversion provides cubes of elastic properties that can be interpreted in terms of reservoir lithology, facies probability volumes and fluid content using our Lithology Classification Workflow.
Our geostatistical inversion workflows generate multiple high-frequency models for high-resolution reservoir characterization and uncertainty analysis. They address the band-limited nature of deterministic inversion methods and integrate well data and seismic data at a fine scale within a stratigraphic geomodel framework. The numerous realizations of the geostatistical inversion can be ranked and interpreted in terms of lithology and porosity uncertainty and ultimately used as input to reservoir modeling.
CGG GeoConsulting has developed a 4D inversion workflow extending the 3D simultaneous elastic inversion to joint multi-vintage inversion, with simultaneous inversion of all angle stacks for base and monitor surveys. Used to image and analyze reservoir changes in pressure and fluid saturation to optimize hydrocarbon recovery.
Based on a petro-elastic model (PEM), petrophysical inversion simultaneously integrates all subsurface information to provide reliable, quantitative, fine scale descriptions of reservoir properties. It provides a direct link between seismic data and reservoir modeling, as it is applied on a geo-cellular model filled with rock properties in depth. This process directly inverts for cubes of reservoir properties such as porosity and saturation, rather than acoustic impedance and Vp/Vs changes.
CGG GeoConsulting seismic inversion workflows ensure that the seismic contribution to the reservoir model is optimized and history matching is performed taking into account the impact of seismic and subsurface uncertainties on the production forecasts.
Defining lithology classes and prediciting facies distribution to gain a better understanding of the reservoir rocks and fluids
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