The results indicate that the natural gas of the xujiahe formation mainly derived form the lower strata 结果表明，研究区须家河组的天然气主要来源于下伏地层。
2.
The static headspace gas analytical technique is mainly devoted to the analysis of physically - adsorbed and dissolved light hydrocarbons whose composition and content can directly reflect oil and gas information of the underlying strata 摘要静态顶空气分析技术主要是物理吸附轻烃及溶解轻烃，其组成和含量上的特徵可直接反映对应地层及下伏地层的含油气信息。
