3D Resistivity Mapping for Real-Time Seismic Correlation
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Solution Overview
Problem
Existing methods for interpreting 3D resistivity volumes during drilling operations struggle to integrate seamlessly with seismic maps, making it difficult to update or correlate these maps in real-time for proactive geosteering decisions and field development.
Innovation Solution
A method is disclosed for transforming 3D resistivity volumes from pointset format to SEG-Y format, applying resistivity thresholds to identify resistivity contrasts, and using 3D auto-tracking tools to characterize horizons and interfaces, enabling integration with seismic data for real-time updates during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 3D resistivity volumes are generated using electromagnetic logging measurements, then detailed subsurface formation information is obtained, but integration and correlation with existing seismic maps becomes difficult
Solution Approach 1:
The patent introduces an intermediary processing system that transforms 3D resistivity volume data into a format compatible with seismic maps. The system applies resistivity thresholds to identify contrasts, uses 3D auto-tracking tools to characterize horizons and interfaces, and transforms the data into formats that can be correlated with existing seismic interpretations, thereby mediating between the two different data types
Solution Approach 2:
The patent changes the parameters of the resistivity data by applying resistivity thresholds to identify contrasts between different formation types. This parameter transformation converts continuous resistivity values into discrete contrast information that can be more easily correlated with seismic interpretations and geological boundaries
2Reliability
If traditional 3D resistivity inversion methods are used, then resistivity volumes are generated, but real-time updates and modification of seismic maps during drilling is difficult
Solution Approach 1:
The patent implements a dynamic system that allows for real-time updates during drilling operations. The 3D auto-tracking tools continuously characterize horizons and interfaces as new resistivity data becomes available, enabling the system to adapt and update reservoir maps dynamically rather than relying on static pre-drilling seismic interpretations
Solution Approach 2:
The patent establishes a feedback loop where resistivity measurements taken during drilling are processed and used to update and modify seismic maps in real-time. This feedback mechanism allows geosteering decisions to be made based on updated information about actual formation conditions encountered during drilling
3Measurement precision
If expert interpretation of seismic and logging data is used, then reservoir maps are created, but automated real-time geosteering decisions cannot be made
Solution Approach 1:
The patent implements self-service capabilities through automated processing systems that perform resistivity thresholding, 3D auto-tracking of horizons and interfaces, and real-time map updates without requiring continuous expert intervention. The system serves itself by automatically processing incoming data and generating updated reservoir maps
Solution Approach 2:
The patent performs preliminary automated processing of resistivity data by applying thresholds and characterizing horizons in advance, preparing the data for rapid geosteering decisions. This preliminary action enables automated systems to make real-time decisions based on pre-processed formation information
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for improved integration of resistivity data with seismic maps, facilitating real-time updates and enhancing geosteering decisions and field understanding.
Implementation Method 1
making deep or ultradeep electromagnetic logging measurements in the wellbore
Data Source
AI summary
A method for three-dimensional (3D) reservoir mapping includes obtaining a 3D resistivity volume in pointset format and transforming the 3D resistivity volume in pointset format to a 3D resistivity map in Society for Geological Exploration (SEG-Y) format. A method for identifying an interface between a high resistivity volume and a low resistivity volume may further include applying a first resistivity threshold to the 3D resistivity map in the SEG-Y format to generate a binary resistivity volume in which cells in the 3D resistivity map having a resistivity value greater than the first resistivity threshold are assigned a first high resistivity value and cells having a resistivity value less than the first resistivity threshold are assigned a second low resistivity value; and evaluating the binary resistivity volume to identify the interface between the high resistivity volume and the low resistivity volume.