Overcoming the Challenge of Complex Reservoir Characterization

4D seismic together with reservoir simulation results are a powerful tool in optimizing production over the life of an oilfield..

4D seismic together with reservoir simulation results are a powerful tool in optimizing production over the life of an oilfield.

Engineers and geoscientists know more than anyone about the challenges associated with complex reservoir characterization, especially in systems such as unconventionals, carbonates, and sands. Continuous monitoring entails the provision of new data which must be assimilated with existing information to achieve a full analytical profile of the reservoir in question. What’s needed is a visual aid that combines old and new data in a crisp visual format that’s accessible to all team members.

The ability to integrate petrophysical and geological data within a single geospatial framing would allow users to understand shifting dynamics within complex reservoir systems. With the ability to cross-plot and visualize the changes in data over time (4D), analysts can find potential obstacles that could hamper development and make a correlation between wells that wouldn’t have been available without the use of data integration.

The Role of 4D in Data Visualization

Data integration is paramount to complex reservoir characterization, but the addition of 4D capabilities allows analysts to obtain a clearer view of subsurface variations and how they change over time. Quality seismic responses are helpful, but a seismic grid combined with other vital subsurface datasets gives a more resolute dynamic profile of the reservoir, regardless of its complexity.
CoViz 4D, an integrated software solution created by Dynamic Graphics, Inc., offers the visualization and analysis of multidisciplinary data. Its 4D capabilities are especially useful if analysts are dealing with a complicated reservoir structure and flow patterns with a constant stream of varied and mass data, as the 4D addition enhances the seismic history match and improves the reservoir flow models based on understanding of pressure and fluid variations over time.

CoViz 4D fosters the following:

  • the tracking of fluid and pressure fluctuations at a subsurface level
  • better understanding to improve well placement and well positioning plans
  • the increased likelihood of discovering bypassed reserves
In terms of detailed resolution, leveraging CoViz 4D also increases the chance that users can find precarious anomalies that may lead to pressure or fluid disturbances. For example, if a team finds a gas kick that leads to a well control issue in a shale reservoir, to obtain a more comprehensive understanding of the problem, team members would need to compare 4D seismic data to the original survey taken before production began and another post-production survey to trace the root of the gas kick.
With the ability to filter, and compare, grid differences, CoViz 4D can display areas of increased pressure as a possible source. The addition of seismic grid differences, well logs, and wellpaths in a 4D visual scope can alert team members to an existing problem or indicate that a quality seismic survey is needed to view the obstacles with additional clarity.
CoViz 4D allows asset teams to visualize all relevant data in a comprehensive viewing environment instead of relying on low-resolution surveys to make decisions that may fail to identify anomalies and potential risk or potential.

The Role of 4D in Data Analysis

4D visualization is also useful when comparing predicted simulation with on-the-ground events. For instance, if a team discovers a discontinuity between a seismic response and a reservoir simulation model in an offshore oil field, the combination of reservoir simulation data with time-lapse geophysical data can pinpoint the problem and allow them to craft a proper solution to address the issue. With CoViz 4D, the team could trace the root of the discrepancy in the following ways:

  • take a series of temporal animation shots over a certain period
  • analyze subsurface data including seismic surveys, prediction models, amplitude variations of reservoir sands, and well event data to ensure a reservoir is performing as expected.
  • compare a baseline survey to an updated seismic survey
The comparisons between new and old surveys are especially paramount, as they can expose anomalies that are the root cause of disconnects between the simulation and the production data. Such comparisons could reveal deviations in the form of high-pressure disturbances or water injection issues in the upper parts of a reservoir, which are not reflected in the associated predictive reservoir models.
CoViz 4D can be used to expose unforeseen challenges, such as a pressure dip stemming from a gas breakout—all revealed by analysis of the time-lapse seismic response. With all of this evidence gathered, a team can conclude, for example, that injector perforations in upper sands underwent a blockage, causing water injection complications in lower zones and unexpectedly higher water rates in the upper zone. With the ability to integrate and analyze data in CoViz 4D, asset teams can implement the necessary adjustments and optimize oilfield production.

Complex Reservoir Characterization with CoViz 4D

The key to a thorough understanding of complex reservoir conditions is integrated 4D data, across a range of disciplines, that allows users to draw connections and find potential sources of contention. The inclusion of 4D fosters the necessary visual and analytical tools to help teams make the right decisions on the field. With merged data and high-resolution visuals, team members understand well conditions faster and pinpoint anomalies earlier.

Complex reservoir characterization using static low-resolution surveys can mask aberrations and hide detailed aspects of subsurface dynamics and well conditions.

Complex reservoir characterization using static low-resolution surveys can mask aberrations and hide detailed aspects of subsurface dynamics and well conditions. However, CoViz 4D has the necessary capabilities to merge multi-disciplinary data into a central system, where geoscientists and engineers can better understand the data. With a cohesive team dynamic, diverse disciplines can more confidently understand and contribute detailed analysis to ensure the quick identification of any issues and, therefore, achieve optimum production.

CoViz 4D, a data visualization analytics software from Dynamic Graphics, Inc., contains clear 4D visuals that highlight reservoir conditions with enhanced resolution, allowing analysts to gain a better understanding of complex reservoirs. Geoscientists and engineers alike can obtain a real-time evaluation of lithogic and engineering aspects of the reservoir, with no need for additional training or varied formats. Contact our team today to learn more about CoViz 4D and how it can improve your understanding of complicated reservoir systems.

FURTHER READING

Enhancing Mature Field Development for Bypassed Pay Extraction

Analyzing geologic structure, reservoir temperature and infill well placement for extracting bypassed pay with CoViz 4D.Analyzing several individual, temporally-spaced datasets is the basis for defining bypassed pay in mature field development. Bypassed pay...

Using 3D Visualization of Hydraulic Fracturing in Unconventional Reservoirs to Maximize Recovery

Visualization and analysis of previous fracturing operations in adjacent wells can help guide planning and development of infill drilling and in new unconventional reservoirs. CoViz 4D offers the ability for asset teams to integrate, visualize and analyze relevant...

Improve Drilling Accuracy and Efficiency with Integrated WITSML Data

Target analysis and wellpath ellipses of uncertainty along a proposed wellbore, viewed in conjunction with structural models, can greatly reduce the risk associated with many drilling hazards.Well-site Information Transfer Standard Markup Language (WITSML) is the...

Minimizing the Uncertainty of Well Trajectory Calculations

Positional uncertainty can be calculated anywhere along the wellpath, from tie-on to total depth.A well-understood fact: Absolute location accuracy is nearly impossible because of the inherent positional uncertainty (commonly referred to as “errors”) in measurements...

Geomechanical Analysis: Better Understanding of Deformation Through Data Visualization

Vertical displacement and strain grids calculated using the CoViz 4D Geomechanics workflow. In the vertical displacement grid on the left, positive (orange) displacement in the overburden represents compaction (movement down toward the center of the earth) and the...

Understanding the Role of Data Integration in Wellbore Trajectory Planning

Geologic complexity and a maze of existing wellbores can challenge the best well planners to navigate subsurface environments and determine the optimum wellbore trajectories for new, sidetrack, multilateral, or infill wells. Well planners share the responsibility with...

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
hide
XHot Key: CTRL-Q

Share on Social Media