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天然气成熟度评价是天然气藏气源对比和成因研究的重要内容。塔里木盆地克拉2气田的实例显示,两种常规方法(天然气组分δ13C-Ro关系式、典型烃源岩热模拟δ13C1-Ro关系图版)所确定的天然气成熟度结果差别较大,表明常规方法具有明显的局限性。结合地质条件,应用碳同位素动力学方法评价克拉2气田天然气成熟度Ro值为1.3%~2.5%,这一结果不仅与地质实际较为吻合,而且也得到相关研究成果的支持。
The evaluation of natural gas maturity is an important part of the research on gas source contrast and genesis in natural gas reservoirs. The example of the Kela-2 gas field in the Tarim Basin shows that the natural gas maturities determined by the two conventional methods (the δ13C-Ro relation of natural gas components and the δ13C1-Ro diagram of a typical source rock) vary widely, indicating that conventional methods have Obvious limitations. According to the geological conditions, the carbon isotope dynamic method is used to evaluate the natural maturity of natural gas in the Kela-2 gas field with a value of 1.3% -2.5%. This result not only agrees well with the geological reality, but also is supported by relevant research results.