AFM Thermal Analysis of Source Rocks
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Solution Overview
Problem
Conventional methods for predicting thermal conductivity in geological formations lack the resolution to account for microscale and nanoscale heterogeneities, affecting reservoir modeling and well production performance.
Innovation Solution
The use of atomic force microscopy (AFM) for nanoscale and microscale measurements of thermal conductivity and material transition temperatures in source rock samples, allowing for high-resolution analysis of organic and inorganic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used for predicting thermal conductivity, then the prediction process is simple, but the resolution is insufficient to account for microscale and nanoscale heterogeneities
Solution Approach 1:
The patent segments the measurement process into multiple stages: first acquiring a topography map to identify regions of interest, then selecting specific measurement areas based on that map, and finally performing thermal conductivity measurements only at those selected locations. This segmentation allows high-resolution measurements to be focused on critical areas rather than the entire sample, thereby improving measurement precision while controlling complexity
Solution Approach 2:
The patent introduces a hierarchical measurement approach that operates at multiple scales: macroscopic topography mapping, mesoscopic region selection, and microscopic thermal property measurement. By adding these dimensional layers of analysis, the system achieves microscale and nanoscale resolution without requiring the entire measurement system to operate at those scales simultaneously, thus managing complexity while improving precision
2Measurement precision
If high-resolution AFM measurements are performed across the entire sample, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The patent performs preliminary topography mapping and region identification before conducting the actual thermal conductivity measurements. By pre-identifying regions of interest and selecting measurement areas based on the topography map, the system prepares the sample in advance, so that subsequent high-resolution measurements can be performed quickly at predetermined locations rather than requiring comprehensive scanning of the entire sample
Solution Approach 2:
The patent applies partial action by performing high-resolution thermal measurements only at selected measurement areas rather than across the entire sample. The topography map and region selection provide a framework that allows measurements to be concentrated on critical regions, achieving sufficient precision for the application without the time cost of exhaustive full-sample measurement
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 provides detailed thermal property data that enhances reservoir modeling, improves well production performance, and optimizes hydraulic fracturing operations by accounting for the unique properties of kerogen, bitumen, and pyrobitumen at the nanoscale.
Implementation Method 1
nanoscale and microscale measurements of thermal conductivity and material transition temperatures in source rock samples
Implementation Method 2
atomic force microscopy (AFM) for nanoscale and microscale measurements
Data Source
AI summary
A system and method for evaluating a geological formation including subjecting a source-rock sample from the geological formation to atomic force microscopy (AFM) to determine a thermal property or material property of the source-rock sample. The properties determined may include thermal conductivity or material transition temperature.