Kerogen-Rich Shale Evaluation via Atomic Force Microscopy
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Solution Overview
Problem
Characterizing the heterogeneous nature of kerogen-rich shale formations at micro- and nanoscales is challenging due to their complex composition and structure, which affects the interpretation of electrical conductivity and mechanical properties, making it difficult to accurately evaluate hydrocarbon potential in unconventional reservoirs.
Innovation Solution
The method involves using atomic force microscopy (AFM) to measure electrical conductivity and mechanical properties at micro- and nanoscales, correlating these with chemical components, allowing for high-resolution mapping and upscaling to field data, including resistivity logs and seismicity, to better understand the kerogen-rich shale formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bulk measurement methods are used to characterize kerogen-rich shale, then the measurement process is simple, but the measurement precision is insufficient to capture the heterogeneous nature at micro- and nanoscales
Solution Approach 1:
The patent applies segmentation by dividing the shale sample into multiple measurement zones at micro- and nanoscales using AFM. Instead of measuring the entire bulk sample as a single unit, the system segments the heterogeneous material into distinct regions (e.g., kerogen-rich zones, mineral-rich zones, pore networks) and measures each segment's electrical conductivity and mechanical properties independently, thereby capturing the fine-scale heterogeneity that bulk methods miss.
Solution Approach 2:
The patent transitions from zero-dimensional bulk measurements to one-dimensional surface mapping and two-dimensional spatial correlation. By using AFM to map electrical conductivity and mechanical properties across the sample surface and correlating these maps with chemical component distributions, the system adds spatial dimensionality to the measurements, enabling characterization of heterogeneity that conventional bulk methods cannot resolve.
2Measurement precision
If multiple measurement techniques are used to characterize chemical and physical properties, then the evaluation accuracy is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent merges multiple measurement techniques into a single integrated AFM system that simultaneously or sequentially measures electrical conductivity, mechanical properties, and chemical component identification. By combining these measurements at the same micro- and nanoscale locations, the system eliminates the need for separate bulk measurement procedures and their associated alignment and correlation difficulties, thereby reducing the overall measurement complexity while maintaining high evaluation accuracy.
Solution Approach 2:
The patent uses AFM as an intermediary platform that bridges different measurement domains. The AFM system serves as a mediator between electrical conductivity measurement, mechanical property measurement, and chemical analysis, allowing all these properties to be measured at the same spatial locations without requiring separate bulk measurement systems. This intermediary approach simplifies the detection and measurement process while maintaining comprehensive characterization.
3Measurement precision
If high-resolution mapping at micro- and nanoscales is performed, then the characterization accuracy is improved, but the loss of time increases
Solution Approach 1:
The patent applies continuity of useful action by performing electrical conductivity mapping, mechanical property measurement, and chemical component identification in a continuous, integrated manner at the same micro- and nanoscale locations. Rather than completing separate bulk measurements sequentially, the AFM system continuously probes the sample surface, collecting multiple types of data simultaneously across different spatial zones, thereby reducing the total measurement time while maintaining high characterization accuracy.
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 enables the isolation and quantification of electrical properties within the shale rock matrix, improving the interpretation of hydrocarbon potential by linking electrical conductivity with mechanical and chemical characteristics, enhancing the accuracy of formation evaluations and hydrocarbon production strategies.
Implementation Method 1
measuring, via atomic force microscopy (AFM), the electrical conductivity of the KRS sample
Implementation Method 2
measuring, via atomic force microscopy (AFM), a mechanical property of the KRS sample
Implementation Method 3
identifying, via spectroscopy, chemical components of a KRS sample
Data Source
AI summary
A system and method for evaluating kerogen-rich shale (KRS) including measuring, via scanning microscopy, electrical conductivity of a KRS sample and a mechanical property of the KRS sample.