1D Earth Volume Geometry Transformation for Log Inversion
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Solution Overview
Problem
The challenge in downhole electromagnetic measurements is obtaining a sufficient quantity of data for reliable inversion of complex formation structures, as existing techniques struggle to provide accurate gain-compensated full tensor measurements.
Innovation Solution
A method and system for transforming two-dimensional or three-dimensional earth volume geometry into a one-dimensional approximation for forward modeling or inversion, involving the identification of layer boundaries, generation of vectors, and assignment of property values to simulate boundaries perpendicular to these vectors, allowing for improved petrophysical and geological modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If full tensor propagation measurements are used to obtain complete formation property measurements, then measurement completeness is improved, but measurement accuracy and reliability deteriorate due to difficulty in providing accurate gain compensation
Solution Approach 1:
The patent extracts and separates the gain compensation problem from the full tensor measurement process. By identifying and removing the problematic full tensor measurements, the system uses only the reliable subset of measurements (those that can be accurately gain-compensated) to perform inversion, thereby maintaining measurement accuracy while still obtaining sufficient data quantity for reliable formation property determination
Solution Approach 2:
The patent applies partial action by using only the portion of tensor measurements that can be reliably gain-compensated rather than attempting to use all full tensor measurements. This selective approach ensures measurement precision is maintained while still providing sufficient data quantity for inversion by focusing on the quality of measurements rather than the total quantity
2Measurement precision
If complex formation structures are modeled using detailed 2D or 3D geometry, then model accuracy is improved, but computational complexity and data processing requirements worsen
Solution Approach 1:
The patent segments the complex 2D or 3D formation geometry into simplified 1D radial layers for the inversion process. By dividing the complex structure into concentric cylindrical zones (wellbore, invasion zone, formation), the system maintains the essential geological features while dramatically reducing computational complexity and making the inversion problem tractable
Solution Approach 2:
The patent transforms the problem from 2D or 3D geometry to a 1D radial model by collapsing the angular and vertical dimensions. This dimensionality reduction converts complex multi-dimensional inversion into a simpler one-dimensional radial inversion, significantly reducing computational requirements while preserving the essential formation properties through careful selection of radial zones
Data Source
AI summary
A method for transforming a 2D or 3D earth volume geometry into a 1D earth volume geometry includes performing a measurement using the measurement sensor in a wellbore. A layer boundary in the 2D or 3D earth volume geometry that is nearest to the measurement sensor is identified. A vector from the measurement sensor is generated toward the nearest layer boundary. A first intersection is identified between the vector and the nearest layer boundary, and a second intersection is identified between the vector and another layer boundary. Simulated boundaries that extend through the first and second intersections and are perpendicular to the vector are generated. The 1D earth volume geometry that is bounded by the first and second intersections is identified. A property value is extracted from the 2D or 3D earth volume geometry between the first and second intersections. The property value is assigned to the 1D earth geometry.