Isotopologue Signature Analysis for Source Rock Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods face challenges in determining the presence of source rocks and timing of hydrocarbon generation, especially when multiple source rocks are present, as they often rely on indirect estimates and can lead to uncertainty in identifying the responsible source rock for hydrocarbon accumulation.
Innovation Solution
A method involving the analysis of hydrocarbon samples for geochemical signatures, such as multiply substituted isotopologue and position specific isotope signatures, to determine historical temperatures and define generation timing, which is then used to refine exploration, development, or production strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct observation techniques are used to detect hydrocarbon presence, then the presence of source rock and hydrocarbon can be confirmed, but insufficient information is provided to determine which source rock generated the hydrocarbons when multiple source rocks are present
Solution Approach 1:
The patent uses hydrocarbon composition and isotopic signatures as intermediary indicators to trace back to the specific source rock. By analyzing the chemical fingerprint of the hydrocarbons (biomarkers, isotopic ratios), the method mediates between the observed hydrocarbon presence and the unobserved source rock identity, enabling identification of the generating source rock without directly observing it.
Solution Approach 2:
The patent implements a feedback loop where hydrocarbon samples are analyzed for composition and isotopic signatures, which then provide information back about the source rock characteristics and generation timing. This feedback mechanism allows iterative refinement of the exploration strategy based on the chemical evidence returned from the subsurface hydrocarbons.
2Loss of time
If basin modeling is used to predict source rock maturation timing, then estimates of hydrocarbon generation time can be obtained, but significant uncertainty results when direct temperature information is not available or when hydrocarbons represent mixtures from different source intervals
Solution Approach 1:
The patent changes the measured parameters from direct temperature measurements to hydrocarbon compositional parameters (biomarker ratios, isotopic signatures). These compositional parameters serve as proxies for temperature and timing, allowing indirect measurement of maturation conditions with reduced uncertainty. The hydrocarbon composition changes systematically with temperature and time, providing a calibrated parameter set for inference.
Solution Approach 2:
The patent uses a composite approach by combining multiple independent geochemical indicators (different biomarker ratios, multiple isotopic systems, various hydrocarbon fractions) to determine source rock maturation. This composite methodology integrates multiple lines of evidence that collectively reduce uncertainty compared to any single indicator alone, providing a more robust determination of timing and temperature history.
3Loss of information
If indirect estimates from hydrocarbon composition are used to determine source rock maturity, then timing information can be obtained, but uncertainty increases when hydrocarbons represent mixtures from different source intervals
Solution Approach 1:
The patent segments the hydrocarbon mixture into distinct compositional components (different biomarker families, isotopic fractions, hydrocarbon classes) that can be individually analyzed. By separating and analyzing these segments, the method can identify which components originate from which source rock intervals, thereby resolving mixtures and improving source identification reliability.
Solution Approach 2:
The patent applies different analytical approaches to different hydrocarbon components based on their specific characteristics. Each hydrocarbon fraction or biomarker group is analyzed with methods optimized for that specific component type, allowing tailored interpretation that accounts for the unique properties and source indicators of each segment, thereby improving overall source identification 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 enhances the ability to determine the presence and timing of source rock maturation, trap, and seal presence, thereby de-risking hydrocarbon exploration and production by providing more accurate information on hydrocarbon generation and migration history.
Implementation Method 1
analyzing the sample for a geochemical signature, wherein the geochemical signature comprises one or more of a multiply substituted isotopologue signature and a position specific isotope signature
Implementation Method 2
analyzing the sample for a geochemical signature, wherein the geochemical signature comprises one or more of a multiply substituted isotopologue signature and a position specific isotope signature
Data Source
AI summary
A method and system are provided for exploration, production and development of hydrocarbons. The method involves analyzing a sample for a geochemical signature, which includes a multiply substituted isotopologue signature and/or a position specific isotope signature. Then, historical temperatures are determined based on the signature. The historical temperature is used to define generation timing, which is used to develop or refine an exploration, development, or production strategy.