Mud Shale Hydrocarbon Volume Evaluation With Light Loss Correction
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Solution Overview
Problem
Existing methods for evaluating the oil-bearing property of mud shale are predominantly qualitative, suffer from significant light hydrocarbon loss during sample preparation, and lack a comprehensive quantitative assessment of discharged and externally charged hydrocarbons, which is crucial for optimizing drilling success.
Innovation Solution
A method and apparatus that determine a hydrogen index and current hydrocarbon generation potential parameter using total organic carbon and pyrolysis analysis data, followed by light hydrocarbon correction and classification of organic matter types, establishing evolution models to quantify volumes of discharged and externally charged hydrocarbons based on mass balance principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional pyrolysis analysis methods are used to evaluate mud shale oil-bearing property, then the evaluation process is simple, but significant light hydrocarbon loss occurs during sample preparation leading to inaccurate results
Solution Approach 1:
The patent applies preliminary action by performing light hydrocarbon correction before final evaluation. The method pre-establishes correction factors based on the relationship between S1/TOC ratio and light hydrocarbon loss, then applies these corrections to compensate for losses that would otherwise occur during standard sample preparation and analysis procedures.
Solution Approach 2:
The patent changes parameters by introducing corrected hydrocarbon volume parameters (Vch-correction, Vch-discharged, Vch-externally charged) that account for light hydrocarbon loss. It transforms the evaluation from using raw S1 and TOC values to using corrected values that reflect actual in-situ conditions, thereby improving measurement precision while maintaining procedural simplicity.
2Ease of operation
If qualitative comparison methods are used for oil-bearing property evaluation, then the evaluation is easy to perform, but quantitative characterization of discharged and externally charged hydrocarbons is not realized
Solution Approach 1:
The patent segments the total hydrocarbon volume into distinct components: discharged hydrocarbon (Vch-discharged) and externally charged hydrocarbon (Vch-externally charged). This segmentation is achieved by calculating the difference between original hydrogen index (HIo) and current hydrogen index (HI), then attributing portions to different sources based on mass balance principles. This allows quantitative characterization while maintaining operational simplicity through systematic calculation steps.
Solution Approach 2:
The patent uses hydrogen index (HI) and original hydrogen index (HIo) as intermediary parameters to bridge qualitative evaluation and quantitative characterization. These intermediaries enable the transformation from simple S1/TOC ratios to detailed quantitative information about hydrocarbon volumes, their origins, and their states without requiring complex additional measurements.
3Device complexity
If OSI value threshold method is used to evaluate oil-bearing property, then the evaluation method is straightforward, but misjudgment occurs when S1 and TOC values are very low even though OSI>100 HC/g TOC
Solution Approach 1:
The patent changes the evaluation parameter from OSI value alone to a composite approach using S1, TOC, and their ratio (S1/TOC) together with corrected hydrocarbon volumes. By considering absolute values alongside ratios and applying light hydrocarbon correction, the method avoids misjudgment in low-S1/TOC scenarios while maintaining straightforward calculation procedures.
Solution Approach 2:
The patent applies preliminary action by establishing correction factors and evaluation criteria before actual evaluation. It pre-defines the relationship between S1/TOC ratio and light hydrocarbon loss, and sets forth the mass balance equations for calculating discharged and externally charged hydrocarbons, ensuring reliable results before field application without requiring complex real-time adjustments.
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 a reliable, quantitative evaluation of hydrocarbon volumes in mud shale, addressing the limitations of prior art by ensuring accurate and efficient assessment of discharged and externally charged hydrocarbons, thereby guiding oil-bearing property evaluation and resource optimization.
Implementation Method 1
pyrolysis analysis test data
Data Source
AI summary
A method and apparatus for evaluating volumes of discharged hydrocarbon and externally charged hydrocarbon in a mud shale. The method comprises: determining a hydrogen index and a current hydrocarbon generation potential parameter of a mud shale in target block based on total organic carbon test data and pyrolysis analysis test data of the mud shale; determining an original hydrogen index of the mud shale based on the hydrogen index and the pyrolysis analysis test data; and evaluating a volume of discharged hydrocarbon and a volume of externally charged hydrocarbon in the mud shale based on the current hydrocarbon generation potential parameter and the original hydrogen index.