Assessing Proven Recoverable Reserves for Oil and Gas Reservoirs

CoViz 4D allows various data sources to be integrated and presented in a shared environment for visualization and analysis.

Accurate reservoir characterization benefits every aspect of development and production activities. However, one of the greatest challenges of reservoir characterization concerns the diversity of data used by the individual disciplines of the reservoir team. Each discipline uses specialized software products. Each provides insight into a specific reservoir attribute such as pressure, fluid saturation, net-to-gross, or velocity. Each has inherent value in depicting reservoir characteristics.

Software that allows the various data sources to be integrated and presented in a shared environment for visualization and analysis maximizes the value of those data and allows reservoir teams to more accurately assess a reservoir’s proven recoverable reserves.

Data Visualization Assists in Determining Proven Recoverable Reserves

Technology and market conditions are also critical factors in determining proven recoverable reserves.
An environment that integrates relevant subsurface data and presents it in a 3D visualization environment for collaborative analysis by a reservoir team facilitates faster, more accurate determination of proven recoverable reserves. It can accomplish this using the following methods:

3D Geologic Models to Depict Subsurface Environment

Interpreted seismic and petrophysical data are combined to calculate a 3D geologic model that is used to generate contour and isochore maps as well as cross sections. With these 3D reservoir models, reservoir teams gain an accurate understanding of complex structural and stratigraphic features such as reverse faults, growth faults, and zone pinchouts. In addition to helping understand geologic conditions that influence (and constrain) reservoir development, these 3D geologic representations provide a foundation for conducting volumetric and hydrocarbon entrapment analysis to determine proven recoverable reserves.

Refined Reservoir Simulations to Estimate Reserves

Combining a reservoir simulation model with other subsurface data in a single geospatial volume gives reservoir engineers the ability to analyze data in context, compare interpretations, and reach a deeper understanding of data interdependencies and modeling assumptions. Reservoir teams can refine simulation variables to more closely approximate reservoir characteristics. Improved models provide better estimates of recoverable reserves and help guide development and operational decisions to maximize recovery.
Seismic data integrated with reservoir simulation in a 3D collaborative visualization environment.

Integrating seismic data with reservoir simulation in a 3D collaborative visualization environment enables reservoir teams to make better, more informed decisions regarding reserve estimates.

Reassessed Proven Recoverable Reserves

In the production phase, visualization and analytic software capabilities that bring together the most relevant data regarding changing reservoir conditions can assist reservoir engineers in reassessing proven recoverable reserves in the following ways:

  • Compare production volumes to date with estimated ultimate recovery (EUR).
  • Evaluate oil-gas-water production metrics for each well across a group of wells or an entire field to help identify candidates for EOR programs.
  • Update reservoir models with new interpretations to show how recoverable reserve volumes have changed in response to ongoing well production.
  • Explore the underlying reasons (geology, stimulations, wellbore attributes) why production metrics differ from reservoir simulation model predictions.

Based on the outcome of the analysis, reservoir engineers can modify development and production strategies accordingly. That may include adding injection wells to enhance recovery, sidetracking to access newly identified pay zones, use of proppants in fracturing treatments, or any other methods that have been proven successful in nearby wells or reservoirs with similar characteristics.

Time-Step Analysis (4D) for Better Estimates

Time-step analysis (4D) of seismic data and production data also facilitates better estimates of proven recoverable reserves. Time-step analysis can reveal trends that may not otherwise be apparent in 2D charts (decline curves) or 3D images. Time-step seismic data combined and analyzed with production data allow geophysicists and production engineers to:

  • Calculate differences between time steps to see how the rate of change in production or oil/gas saturation has varied by well, by field, by recovery method, or other relevant reservoir attributes.
  • Update or fine-tune reservoir simulation models per changes observed in recent seismic studies to more accurately forecast production.
  • Identify bypassed oil and recalculate the proven recoverable reserve estimate.
  • Use data from nearby wells or reservoirs with similar geologic attributes and production history to determine the appropriate secondary or tertiary recovery techniques.
CoViz 4D provides a  visualization environment facilitates a comparison of a range of different properties over time.

A 3D visualization environment facilitates a comparison of a range of different properties over time (4D) to provide a clearer understanding of the impact of development and operational decisions on proven recoverable reserves.

4D seismic analysis enables reservoir engineers to gain a better understanding of a reservoir’s dynamic behavior and adjust their models accordingly to more accurately estimate or update proven recoverable reserves. With a more accurate estimate, reservoir teams can then determine if reserves merit further investments in recovery and if so, which methods maximize recovery while minimizing risk.

CoViz 4D: A Proven Tool for Estimating Recoverable Reserves

Data integration, visualization, and analysis software like CoViz 4D allows reservoir teams to obtain greater value from the wealth of data generated during the life of a reservoir. Detailed geologic models provide an initial characterization of hydrocarbon reserve location and volume. Seismic data combined with reservoir simulations help refine proven recoverable reserve estimates. As wells are produced, time-step analysis shows how development and production decisions have impacted reserves, allowing reservoir teams to modify strategies to optimize recovery.

Data integration, visualization, and analysis software like CoViz 4D allows reservoir teams to obtain greater value from the wealth of data generated during the life of a reservoir.

CoViz 4D facilitates accurate reservoir characterization, modeling, and monitoring to give engineers the ability to understand subsurface changes in greater detail and implement production strategies to maximize recovery of proven recoverable reserves.

CoViz 4D, a data visualization analytics software from Dynamic Graphics, Inc., gives geologists, geophysicists, and reservoir engineers the ability to easily access and combine all relevant data associated with subsurface environments. Powerful analytic capabilities enable users to explore data relationships, analyze the accuracy of depth conversion of 3D seismic, and visualize seismic well ties and velocity models to facilitate decisions that positively impact profit and reduce operational risk. To learn more about CoViz 4D contact our team.


4D Seismic Data Visualization: Why the 4th Dimension Is Just As Important As the Other Three

One seismic cube out of a time-lapse series shown with the velocity cube, different geologic models, reservoir simulation grid, production data, and well paths, completions and logs. Putting all this 3D and 4D data into a single environment provides a coherent history...

Efficient Sorting of Oil and Gas Big Data

The oil and gas industry has used big data as a way to fill the information gap in all phases of asset development within an oil field. Associated historical data mostly comes from an individual well in a single geospatial location. From exploration to completion and...

A Proven Workflow for Modeling Complex Geologic Structures

EarthVision provides a proven application to address the significant challenges presented in modeling complex subsurface geologic structures.Achieving as accurate as possible models of complex geologic structures should be the goal of every geoscientist. Yet, there...

Identifying Oil Field Best Practices Through 4D Visualization

The visualization above illustrates the 3D/4D spatiotemporal integration of geologic structure, fracture stage events, microseismic events, wellbore trajectories, and well logs.Growth in the oil and gas industry has enabled the collection and utilization of large data...

A Statistical Approach to Depth Uncertainty Analysis for Model Integrity

3D Depth Uncertainty Model: Depth uncertainty imported into well paths and displayed as cones of uncertainty indicating positional uncertainty to 1 Standard Deviation.Dealing with the fundamental uncertainty of subsurface environments and their hydrocarbon resources...

Application of Real-Time Well Monitoring for Optimized Productivity

Real-time monitoring of reservoir fluids integrated with simulation models and 4D seismic with CoViz 4D allows asset teams to efficiently manage and optimize problem-solving and productivity.Reservoir teams obtain a better understanding of well production when...

Seismic Reservoir Monitoring Through Visualization

An ideal design, development, and management plan for hydrocarbon asset development comes from having a better understanding of  all known geological and petrophysical aspects of the subsurface. But given the dynamic nature of the reservoir and its attributes, petroleum professionals can encounter some complexities in the process of in-depth analysis.

Quick, Accurate Relief Well Planning Using 3D Visualization Software

The crucial initial phase in the drilling of a relief well is the development of an extensive relief well plan. The planning requires geoscientists, drilling engineers, and well planners to have detailed information on the subsurface geology and its attributes as well...

Accessibility Tools
XHot Key: CTRL-Q

Share on Social Media