3He/Enthalpy Analysis for Mantle–Crust Heat Contributions
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Solution Overview
Problem
Current methods lack the ability to accurately analyze and evaluate the relative contributions of mantle and crust heat sources in the context of deep thermal fluid activities, which are crucial for understanding petroleum and natural gas formation, geothermal flow, and thermal history in oil and gas bearing basins, particularly in regions with deep mantle contributions.
Innovation Solution
An evaluation method and device that utilize a heat balance equation and helium isotope analysis to calculate 3He/enthalpy ratios, combining geological surveys, sample collection, and helium purification to determine the relative contributions of mantle and crust heat sources, using a computer-readable medium and a detection device with temperature, pressure, and helium isotope monitoring systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If helium isotope analysis (3He/4He ratio) is used to identify the origin of natural gas, then the origin identification capability is improved, but the ability to accurately evaluate relative heat source contributions remains insufficient
Solution Approach 1:
The patent segments the heat source evaluation by introducing separate evaluation dimensions: using 3He/4He ratio for origin identification and 3He/enthalpy ratio for heat contribution evaluation. This segmentation allows each metric to serve its specific function without interference, resolving the contradiction between origin identification and heat source evaluation capabilities.
Solution Approach 2:
The patent changes the evaluation parameter from 3He/4He ratio (for origin identification) to 3He/enthalpy ratio (for heat contribution evaluation). By changing the parameter, the system can accurately evaluate relative heat source contributions while maintaining the origin identification capability through the separate use of isotope ratios.
2Reliability
If existing evaluation methods are used, then origin identification is achieved, but accurate assessment of mantle and crust heat contributions in deep thermal fluid activities cannot be performed
Solution Approach 1:
The patent introduces enthalpy as an intermediary parameter that connects helium concentration to heat contribution. By using 3He/enthalpy ratio, the system can mediate between the easily measurable helium isotope data and the complex heat source contribution evaluation, achieving precise assessment of mantle and crust heat contributions while maintaining reliable origin identification.
3Ease of operation
If traditional helium analysis methods are applied, then basic origin determination is possible, but evaluation of thermal driving mechanism and relative heat contributions in faulted basins is lacking
Solution Approach 1:
The patent adds another dimension to helium analysis by introducing the 3He/enthalpy ratio evaluation dimension alongside the traditional 3He/4He ratio. This dimensional expansion allows the system to maintain the simplicity of basic origin determination while simultaneously gaining access to thermal mechanism information and heat contribution data, effectively resolving the information loss.
Data Source
AI summary
An evaluation method for relative contributions of heat sources based on helium and application thereof, belonging to the technical field of helium origin identification, migration mechanism, and accumulation process analysis. Relative heat contribution values of the mantle and the crust to a basin geothermal system are estimated by combining 3He/enthalpy ratios calculated according to the formula (1) and the heat balance equation, and an evaluation method for relative contributions of heat sources of helium in the context of deep thermal fluid activities is further improved. A detection device is suitable for deep geothermal resource exploration, thermal fluid activity monitoring in an early stage of oil and gas field development, and geological science research. By precisely evaluating relative contributions of a mantle source and a crust source, combined with temperature and pressure data, a scientific basis is provided for resource development, and exploration risks are reduced.