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深层天然气是油气勘探潜在的重要领域,加强深部勘探成为油气区资源发展的必然趋势。笔者将现有与深层气有关的概念进行了甄别分析,最后厘定深层气为埋藏深度大于4500m,在高温、高压和环境介质共同作用下形成和聚集的天然气,就有机质垂向演化而言,主要指沉积层在生油窗以下层位形成和赋存的天然气,并在此基础上对深层气存在的范围进行了探讨。结合有机-无机相互作用,深入研究了深层天然气气源,认为干酪根、聚集型可溶有机质和分散可溶有机质均对深层天然气的形成具有重大贡献,特别是认为分散可溶有机质在叠合盆地可以作为深层气的重要气源。最后根据中国构造演化、烃源发育特点,初步预测了中国深层天然气的分布状况与范围。
Deep natural gas is an important potential area for oil and gas exploration. Enhancing deep exploration has become an inevitable trend in the development of oil and gas resources. The author of the existing deep gas-related concepts were screened and analyzed, and finally determine the deep gas burial depth greater than 4500m, formed under the action of high temperature and pressure and environmental media and accumulation of natural gas, the vertical evolution of organic matter, the main Refers to the sedimentary layer below the oil production window formation and occurrence of natural gas, and on the basis of the existence of deep gas range were discussed. Combined with the organic-inorganic interaction, the gas source of deep natural gas is deeply studied. It is concluded that kerogen, aggregated soluble organic matter and dispersed organic matter all contribute to the formation of deep natural gas. In particular, it is considered that the dissolved organic matter in the superimposed basin Can be used as an important gas source of deep gas. Finally, based on the tectonic evolution and hydrocarbon source development in China, the distribution and range of deep natural gas in China are predicted.