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天然气生成与石油生成有着不同之处,石油生成要受有机质的种类和地质条件的限制。而天然气生成在达些方面要宽阔得多。天然气生成总的特点是:“只要温度、深度和时间配合适宜。加上有利的地质条件。一般情况下任何有机质都可以生成天然气,并形成气藏”。有机地球化学的三个阶段都可以生成天然气。在成岩作用阶段中主要生成生物成因气。以甲烷为主;在退化作用阶段中天然气主要自干酪根演化成油气的生油过程,除了生成甲烷外还生成大量乙烷以上的气态烃。干酪根的类型不同,在演化生油过程中的产物不同。Ⅰ型和Ⅱ型干酪根可以生成石油窗以上和以下的天然气。Ⅲ型干酪根主要生成天然气。变质作用
There are differences between the generation of natural gas and oil generation. The generation of oil is limited by the types of organic matter and the geological conditions. Natural gas generation is much broader in some respects. The general characteristics of natural gas generation are: “As long as temperature, depth and time are appropriate, plus favorable geological conditions, any organic matter can generate natural gas and form a gas reservoir under normal circumstances”. Natural gas can be generated in all three stages of organic geochemistry. In the diagenetic stage, biogenic gas is mainly generated. Mainly in methane. During the degenerative stage, natural gas evolved mainly from kerogen into oil and gas during oil production. In addition to the formation of methane, a large amount of gaseous hydrocarbons above ethane was also formed. Different types of kerogen, different products in the evolution of raw oil. Type I and Type II kerogen can generate natural gas above and below the oil windows. Type III kerogen generates mainly natural gas. Metamorphism