Quartz Crystallite Size Analysis for Depositional Form Identification
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Solution Overview
Problem
Existing methods are inadequate for accurately identifying the depositional forms of mineral phases and quantifying excess quartz in sedimentary rock samples, which are crucial for understanding hydrocarbon reservoir quality and rock mechanical properties.
Innovation Solution
A method using powder X-ray diffraction (XRD) to measure the crystallite size of mineral phases in sedimentary rocks, allowing identification of depositional forms and quantification of terrigenous and excess quartz based on mean crystallite size, utilizing the Scherrer equation for crystallite size determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing compositional analysis methods are used to identify depositional forms of mineral phases, then the analysis can be performed with standard techniques, but the accuracy of identifying depositional forms and quantifying excess quartz is insufficient
Solution Approach 1:
The invention changes the measurement parameter from standard compositional analysis to crystallite size measurement using XRD. By measuring the crystallite size parameter (D50) of quartz and applying classification thresholds (e.g., D50 < 3 μm for biogenic-excess silica, D50 > 10 μm for terrigenous silica), the method achieves accurate identification of depositional forms while maintaining operational simplicity through automated classification algorithms.
2Measurement precision
If thin section analysis is used to estimate depositional form, then visual inspection can be performed, but the quantification of excess quartz and depositional form identification is imprecise
Solution Approach 1:
The invention replaces the mechanical/visual inspection method of thin section analysis with an automated XRD-based measurement system. The XRD method objectively measures crystallite size parameters and uses automated classification based on predetermined thresholds, eliminating subjectivity in visual inspection while significantly improving both precision of depositional form identification and productivity through rapid automated analysis of multiple samples.
3Measurement precision
If compositional proxies are used to estimate depositional form, then the analysis can be performed using available compositional data, but the identification accuracy of depositional forms remains insufficient
Solution Approach 1:
The invention introduces crystallite size measurement as an intermediary parameter that directly links compositional data to depositional form identification. Instead of using indirect compositional proxies that require multiple assumptions and can lose information, the crystallite size parameter serves as a direct mediator that preserves information about the origin and formation conditions of silica deposits, enabling more accurate identification of depositional forms through automated classification.
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
Enhances the accuracy of identifying depositional forms and quantifying quartz types, improving hydrocarbon exploration by correlating silica deposits with hydrocarbon production and rock mechanical properties.
Implementation Method 1
measuring a parameter indicative of a size of crystallites of the mineral phase in the sedimentary rock sample... utilizing the Scherrer equation for crystallite size determination
Implementation Method 2
powder X-ray diffraction (XRD) to measure the crystallite size of mineral phases
Data Source
AI summary
A method comprises identifying a depositional form of a mineral phase in a sedimentary rock sample based on a measurement of a parameter indicative of a size of crystallites of the mineral phase in the rock sample.