用被动语态翻译这句话：在气相中含有CH4时油层密度峰仍然在吸附态区域出现特别是在纯CH4的情况下吸附层峰值只会微弱地变化。尽管油层在气相的加入下会发生一定程度的膨胀但它并不会脱离石英表面。

When CH4 is present in the gas phase, the density peak of the reservoir still appears in the adsorbed state region, especially in the case of pure CH4, the peak value of the adsorption layer will only change weakly. Although the reservoir will undergo a certain degree of expansion under the addition of gas phase, it will not detach from the quartz surface. (被动语态翻译)