Application of carbon isotope analysis technology in unconventional oil and gas geological research
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摘要:
随着对非常规油气资源勘探开发的深入，碳同位素分析技术已成为揭示油气成因及成藏、富集产出等方面的关键手段，但目前对碳同位素分析技术在非常规油气地质研究中应用的总结较少。通过明确碳同位素分析技术的流程及关键参数，梳理其在非常规油气地质研究的应用情况，阐述目前存在的问题及发展方向。研究认为: 碳同位素分析技术可以进行油气成因判定、油气源对比、成熟度预测、储层连通性及物性判别、“甜点”评价及产能预测5个重点方向的应用研究，在非常规油气地质研究领域具有较好的应用效果。目前碳同位素分析技术存在样品代表性与预处理不足、标准化体系未统一、碳同位素分馏复杂等推广应用方面的困难与挑战，正朝着高精度、原位化和动态监测方向发展。此外，碳同位素分析技术在碳排放溯源、CO2地质封存及地热等场景也具有广阔的发展前景。研究成果可为碳同位素分析技术在非常规油气地质研究中的推广应用提供参考。
Abstract:The carbon isotope analysis technology has become a key means to reveal the genesis, accumulation, enrichment and output of oil and gas, with the in-depth exploration and development of unconventional oil and gas resources. However, relatively few summaries of the applications on carbon isotope analysis technology has been made in the geological research of unconventional oil and gas. By clarifying the process and key parameters of carbon isotope analysis, the authors in this paper have sorted out the application directions in the geological research of unconventional oil and gas and elaborated the existing problems and development directions. The research suggests that carbon isotope analysis can be applied in five key research directions, that is determining the genesis of oil and gas, comparing oil and gas sources, predicting maturity, identifying reservoir connectivity and physical properties, evaluating "sweet spots", and predicting production capacity, which already have good application effects in the field of unconventional oil and gas geology research. At present, several difficulties and challenges existed in the promotion and application of carbon isotope analysis, including insufficient representativeness of samples and pretreatment, lack of uniformity in the standardization system, and the complexity of carbon isotope fractionation. Therefore, the development direction of carbon isotope analysis is moving towards to high precision, in-situ and dynamic monitoring. Meanwhile, carbon isotope analysis also has broad development prospects in scenarios such as carbon emission traceability, CO2 geological storage, and geothermal integration. The conclusions and understanding above could provide references for the promotion and application of carbon isotope analysis technology in unconventional oil and gas geological research.
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