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塔里木盆地和田河气田天然气是成熟度较高的干气 ,二氧化碳和氮气含量高。天然气来自寒武系海相高—过成熟烃源岩 ,属油型气。气田呈近东西向展布 ,西部井区的埋深小于东部井区 ,西部井区天然气二氧化碳含量和干燥系数明显高于东部 ,西部井区甲烷碳同位素重于东部。导致东西部天然气的地球化学特征有明显差别的原因是 ,天然气自东向西运移造成了组分的东西部差异 ;西部井区的压力释放使水中溶解的CO2 大量释放 ,导致CO2 含量增加 ;扩散作用导致了甲烷碳同位素的西重东轻。
The natural gas in the Hetianhe gas field of the Tarim Basin is a high maturity dry gas with a high content of carbon dioxide and nitrogen. Natural gas from the Cambrian marine high - mature source rock, is an oil gas. The gas field is distributed in the near east-west direction. The burial depth of the western well is less than that of the eastern well. The natural gas CO 2 content and the drying coefficient in the western well are obviously higher than those in the east and the carbon isotopes of the methane in the western well are heavier than those in the east. The reason for the obvious difference in the geochemical characteristics of natural gas in the eastern and western regions is that the natural gas migrates from east to west causing the east-west difference in composition. The pressure release in the western well region releases a large amount of dissolved CO2 in the water, resulting in an increase in the CO2 content. The diffusive action led to the heavy carbon of the methane carbon isotope east of East Light.