rockAVO

PGS has added well data including rock physics, interactive seismic AVO modeling capabilities, and data atlases to its MultiClient data library. The integration of seismic with well data enables oil and gas companies to calibrate GeoStreamer and other seismic data with conditioned well data and known production scenarios.

For E&P companies, access to a homogeneous database of interpreted well logs will make it possible to analyze the seismic AVO signature based on different fluid and matrix property perturbations.

Interactive rock physics modeling tools offered in addition to seismic will further improve derisking and make it easier for exploration teams to identify play analogs for prospect screening and analysis. Production teams can use the tools to interrogate near-field opportunities.

Key Benefits

  • Seamless and fast integration of seismic and well data
  • Allows for QC of seismic data by checking for AVO compliance and image integrity
  • Rapid screening for analogs and scenario testing of lithology, fluid and porosity in real-time
  • Interactive rock physics tool for derisking plays
  • Access to rock property information for non-rock physics experts

For further information please contact rockAVO.info@pgs.com

Read more about 'PGS Acquires Rock Solid Images'

PGS Gets Closer to the Reservoir with Rock Physics Integration

Rock physics is the link between the seismic response and geological properties. It explains how rock properties like clay content, porosity and fluid fill influence elastic properties such as velocity and Poisson’s ratio and therefore the prestack seismic amplitude response at the well location.

PGS is integrating well-based rock physics data in their MultiClient data library and offer the interactive rock physics atlas browser rockAVO as a MultiClient product. The current suite of rock physics atlases is a good fit with the PGS seismic data library, especially in the US and Europe, with wells in the Gulf of Mexico, the Barents Sea, the Norwegian Sea, the North Sea, and the UK Central Graben.

The combination of GeoStreamer, reprocessed broadband seismic and imaging technology with rockAVO rock physics tools and atlases offers significant benefits when integrating seismic with well data, for example in demonstrating AVO compliance.

rockAVO data atlases in the Gulf of Mexico and Europe.

 

Unlocking Reservoir Properties

Rock physics properties vary from basin to basin, and from stratigraphic interval to interval. For each, a separate model or rock physics template is required that relates the seismic response to earth properties.

PGS has ample access to seismic and are now adding the geological part that comes from well data. rockAVO, a proven software tool, delivers fully interactive, well by well, rock physics AVO modeling. It transforms a static hardcopy study into a fully dynamic live report making it accessible to every non-rock physics expert.

Existing Rock Physics Atlases

Regional rock physics atlases are available to clients. Each well within these atlases has been conditioned and interpreted consistently and to a high technical standard. Deliverables include the raw and conditioned log data, the petrophysical interpretation and the rock physics modeled elastic logs. Where available, the results are delivered within rockAVO. The table below shows the atlases that are available.

Rock Physics Atlas Country Number of Wells
UK North Sea UK 194
Central Graben UK 53
Norwegian Sea Norway 211
North Viking Graben Norway 21
South Viking Graben Norway 56
East Central Graben Norway 37
Horda Platform Norway 26
Egersund Basin Norway 10
Barents Sea Norway 126
Deep Shelf USA 99
Lower Tertiary USA 29
Green Canyon USA 24
Mississippi Canyon USA 23
North Slope Alaska USA 28

Expanding Rock Physics Products in Support of Exploration

Regional rockAVO atlases for Europe and the Gulf of Mexico will be expanded to new areas, such as West Africa. At the exploration stage, combining regional rock physics atlases with seismic data library coverage will permit fuller and faster calibration of zones of interest and analog screening.

 

191030 RockAVO TechNote figure 860px.png
This rockAVO well view shows rock-physics modeled elastic logs and corresponding synthetic seismic (various fluid content) for direct comparison with the measured seismic traces.

 

Calibrating Well Data to 4D Seismic

Combining 4D well modeling with 4D seismic will offer further proof of the 4D AVO compliance and imaging integrity of PGS seismic data.

4D synthetic AVO modeling can be integrated with measured seismic gathers, using the rockAVO interactive software. Therefore, PGS can now deliver enhanced 4D feasibility studies and scenario modeling of reservoir characteristics, like saturation and pressure changes.

Quantitative Interpretation Advantage

The objective of QI is to derive elastic seismic attributes within their proper geological context. Rock-physics-driven QI techniques combining rockAVO, prestack AVO compliant seismic data and additional post-seismic inversion technologies will enhance the ability of PGS clients to predict rock and fluid type accurately during reservoir review and prospect analysis.

For further information please contact rockAVO.info@pgs.com