Pseudo-Stratigraphic Grid Layering for Accurate Reservoir Geomodeling
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Solution Overview
Problem
Existing geological simulation grids, particularly those based on pseudo-stratigraphic grids, suffer from inaccuracies and time-consuming computations due to cell distortions and complex topologies, leading to unsatisfactory simulation results, as they often lack geological meaning and require approximations.
Innovation Solution
A computer-implemented method for geomodeling using a pseudo-stratigraphic grid that involves determining stratigraphic layering values by interpolating and extrapolating based on a surface's relative position, allowing accurate configuration of the grid for geostatistical and dynamic simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pure stratigraphic grid is used to represent the reservoir, then stratigraphic consistency is improved, but cell distortions occur and simulation accuracy deteriorates
Solution Approach 1:
The patent segments the grid into two independent components: a structural grid that maintains geometric regularity for computational efficiency, and a stratigraphic layering system that encodes geological information. This segmentation allows each component to optimize for its specific function without compromising the other, resolving the contradiction between stratigraphic consistency and simulation accuracy.
Solution Approach 2:
The patent introduces a pseudo-stratigraphic grid as an intermediary representation that bridges the structural grid and the geological model. This intermediary layer allows stratigraphic information to be superimposed on a well-behaved structural grid, enabling accurate representation of complex geology while maintaining computational stability through regular cell geometry.
2Stability of the object's composition
If a tetrahedral grid is used to avoid cell distortions, then cell topology is improved, but physics representation becomes difficult and simulation performance deteriorates
Solution Approach 1:
The patent applies local quality by maintaining different properties at different levels: the structural grid uses regular hexahedral cells with uniform topology for optimal physics representation and computational performance, while the stratigraphic layering system provides locally adapted geological information. This allows each region to have the appropriate quality for its specific function.
3Manufacturing precision
If the geometrical grid is modified to conform to complex geological structures, then geological accuracy is improved, but grid design complexity increases and computational time increases
Solution Approach 1:
The patent performs preliminary action by pre-computing and storing stratigraphic layering information during the grid generation phase. This preliminary processing allows the complex geological information to be encoded efficiently in advance, avoiding the need for complex real-time calculations during simulation and reducing overall computational time.
4Stability of the object's composition
If a pseudo-stratigraphic grid is used to model complex geology, then grid regularity is improved, but layering geological meaning is lost and simulation accuracy deteriorates
Solution Approach 1:
The patent creates a composite model that combines the structural advantages of a regular grid with the geological accuracy of stratigraphic layering. The pseudo-stratigraphic grid serves as the structural framework, while the stratigraphic layering system provides the geological information, creating a composite representation that achieves both regularity and accuracy.
Data Source
AI summary
The invention notably relates to a computer-implemented method of geomodelling. The method comprises providing a pseudo-stratigraphic grid. The pseudo-stratigraphic grid represents a reservoir and has pillars. Each pillar includes respective cells. Each cell has a respective stratigraphic layering index. The method then comprises providing a surface. The surface has a first region and a second region. The second region is complementary to the first region. The method also comprises, for each first pillar intercepted by the first region, determining a respective first stratigraphic layering value based on the relative position of the surface in the first pillar. The method also comprises, for each second pillar intercepted by the second region, determining a respective second stratigraphic layering value by interpolating and/or extrapolating first stratigraphic layering values. This provides an improved solution of geomodeling.