松辽盆地红岗地区浅层气地球化学特征研究

Geochemical characteristics of shallow gas in Honggang region, Songliao Basin

摘要: 根据红岗地区7件明水组浅层气和13件嫩江组浅层气样品的组分和同位素分析,表明明水组浅层气甲烷含量、重烃含量、干燥系数、δ¹³C₁均值分别为92.74%,1.77%,0.981,-56.7‰,而嫩江组浅层气甲烷含量、重烃含量、干燥系数、δ¹³C₁均值分别为90.38%,5.57%,0.942,-52.1‰。明水组浅层气主要为生物气,而嫩江组浅层气属于生物—热催化过渡带气,都属于低熟油型气。

Abstract: The chemical and stable carbon isotopic compositions of 7 shallow gas samples from the Mingshui Formation and 13 shallow gas samples from the Nenjiang Formation in Honggang region have been tested.Results have indicated that the average values of CH₄ content,C₂₊ content,dry coefficient and δ¹³C₁ of the Mingshui Formation are 92.74%,1.77%,0.981 and -56.7‰,respectively,while those of the Nenjiang Formation are 90.38%,5.57%,0.942 and -52.1‰,respectively.The shallow gas from the Mingshui Formation is biogas and that from the Nenjiang Formation is bio-thermocatalytic transitional gas.Both of them belong to low-mature oil-type gas.