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This document specifies the method for determining the characteristic parameters of crystal structure of natural gas hydrates using laser Raman spectroscopy, including specific requirements for the principle, instruments, materials, operational procedures, and data processing. This document is applicable to the structural determination of both naturally occurring and laboratory-synthesized natural gas hydrate samples, as well as the calculation of cage occupancy and hydration number.
Natural gas hydrates are a globally recognized strategic alternative energy source. Their crystal structure parameters are the core foundation for understanding their formation mechanisms, assessing resource potential, and mitigating development risks. Currently, global hydrate research and trial production activities are increasingly active, but the lack of methodological uniformity severely constrains the comparability and mutual recognition of results. Therefore, establishing a high-precision, universally applicable standard for structural analysis is of paramount importance. This document aims to develop an international standard for the determination of characteristic crystal structure parameters of natural gas hydrates using laser Raman spectroscopy. The primary purpose are: 1) To establish a unified international methodological standard, providing a globally recognized and reliable analytical method for hydrate research, and standardizing the complete process from sample preparation, instrument operation, to data acquisition and processing, thereby filling the gap in international standards in this field. 2) To support resource exploration and engineering applications by accurately determining key parameters such as hydrate structure type, cage occupancy, and hydration number, thereby providing fundamental physical property data to support resource reserve evaluation, extraction safety and risk control, and the application of hydrate technology in areas like gas storage/transportation and separation. 3) To promote technical exchange and data sharing by driving data comparison and technical cooperation among global research institutions and industries through standardized methods, thereby accelerating the R&D and commercialization of hydrate technology. The method works by exciting the sample with a laser at a specific wavelength and measuring the resulting Raman shift. This shift occurs because guest molecules inside the hydrate cages scatter the laser light inelastically. Since gas molecules experience different local environments in different cage types, their characteristic Raman peaks shift accordingly. Analyzing these peak shifts allows the hydrate structure to be identified and key parameters to be calculated. The justification for developing this document is as follows. This method offers the following significant advantages: Firstly, it features non-destructive and in-situ analysis capabilities. It enables in-situ, non-destructive measurements under conditions close to reservoir temperature and pressure without the need to crush or specially treat the sample, thereby preserving the sample's original state to the greatest extent possible. This is crucial for studying the natural behavior of hydrates. Secondly, it possesses high sensitivity and high resolution. It can precisely detect minute structural differences and changes in guest molecule composition within hydrates, providing a reliable basis for calculating key indicators such as cage occupancy and hydration number. Thirdly, the technology is mature and widely applied. Laser Raman spectroscopy is already a mature analytical technique with extensive applications in fields like materials science and chemistry. Internationally, relevant ISO standards exist in areas such as natural gas analysis (e.g., for gas composition determination). Leading research institutions and instrument manufacturers globally have accumulated substantial practical experience in applying this technique to hydrate research, laying a solid technical and industrial foundation for the development of this standard.
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