Borehole Image Forward Modeling via Cylindrical Coordinate Transformation
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Solution Overview
Problem
Current wellbore image forward modeling methods are highly dependent on specific logging tool designs and physics theories, limiting their applicability and accuracy in predicting formation properties independently of the tool used.
Innovation Solution
The method involves generating forward modeled wellbore images using offset well data within an interpreted structural model, calculating 3D spatial coordinates, and computing pseudo log values to create continuous modeled images of gamma and density along a target well path, independent of the logging tool design, using techniques like spatial interpolation and trigonometric functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If typical forward modeling methods are used to simulate logging tool responses to formation properties, then modeling results can be obtained, but the results become highly dependent on the particular logging tool design and related physics theory
Solution Approach 1:
The patent introduces an intermediary coordinate transformation system that converts formation property data from offset wells into a standardized cylindrical coordinate framework. This intermediary representation serves as a universal interface between different logging tool designs and the forward modeling process, eliminating direct dependence on specific tool physics while maintaining modeling accuracy through geometric transformation of the formation model.
2Measurement precision
If specific logging tool physics theories are applied in forward modeling, then accurate simulations of tool responses can be achieved, but the methodology becomes limited to that specific tool design
Solution Approach 1:
The patent creates a universal forward modeling framework that can accommodate multiple logging tool types by transforming formation property data into a tool-agnostic cylindrical coordinate system. The methodology uses universal geometric relationships and coordinate transformations that can be applied regardless of the specific logging tool physics, enabling the same framework to serve multiple tool designs while maintaining prediction accuracy through proper spatial transformation of the formation model.
Data Source
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AI summary
A method and system for improving borehole image forward modeling of formation properties is disclosed. An imaginary circle (106) having a plurality of bins (202) is centered at a location of interest at an axial position along the target wellbore (102). The imaginary circle is perpendicular to an axis (110) of the target wellbore and represents a region of the formation to be analyzed. A pseudo log relating to the parameter of interest at the axial position along the target wellbore is then determined. The pseudo log comprises at least a value for the parameter of interest at a desired point corresponding to one of the plurality of bins. The determined pseudo log is then visualized.