本文選題：泥炭 + 模擬實驗��； 參考：《地球科學》2017年09期

【摘要】：煤層氣的成因研究可以為煤層氣勘探與開發(fā)提供科學依據(jù),然而,煤層氣的氫碳同位素組成受多種因素的影響,以前較多的研究是成氣母質(zhì)性質(zhì)和成熟度對煤層氣氫碳同位素的影響,對于成煤物質(zhì)形成的氣候環(huán)境對熱解煤層氣同位素的影響尚不清楚.熱解模擬了高緯度寒冷干旱和低緯度熱帶濕潤環(huán)境的草本泥炭,對熱解烴類氣體的氫碳同位素組成及其差異性進行了研究.研究結(jié)果表明:與低緯度熱帶濕潤環(huán)境中形成的草本泥炭相比較,高緯度寒冷干旱環(huán)境的草本泥炭熱解甲烷、乙烷和丙烷具有輕的氫同位素組成和重的碳同位素組成,并且從泥炭連續(xù)熱解至Ro分別為2.5%、3.5%和5.5%時,甲烷、乙烷和丙烷δD值分別平均降低-17‰~-10‰、-32‰~-28‰和-25‰~-17‰,甲烷和乙烷δ13 C值分別平均升高2.9‰~3.6‰和0.9‰~1.1‰.認為這種同位素差異起因于氣候環(huán)境對形成泥炭的植物氫碳同位素組成的影響.建立了高緯度寒冷干旱和低緯度熱帶濕潤環(huán)境中形成的成煤有機質(zhì)熱解烴類氣體氫碳同位素組成與Ro之間的關(guān)系式,同時也建立了烴類氣體的碳和氫同位素之間的關(guān)系式.這些研究成果為不同氣候環(huán)境下形成的成煤有機質(zhì)生成的煤層氣成因研究提供了科學依據(jù).
[Abstract]:The genetic study of CBM can provide a scientific basis for the exploration and development of CBM. However, the hydrogen and carbon isotopic composition of CBM is affected by many factors. Many previous studies have focused on the effects of the properties and maturity of the gas-forming parent material on the hydrogen and carbon isotopes of coal-bed methane, and the influence of the climate environment formed by the coal-forming materials on the pyrolysis of coal-bed methane isotopes is still unclear. The herbaceous peat in high latitude cold arid and low latitude tropical humid environment was simulated by pyrolysis. The hydrogen and carbon isotopic composition and difference of pyrolytic hydrocarbon gases were studied. The results show that compared with herbaceous peat formed in low latitude tropical humid environment, the pyrolytic methane, ethane and propane of herbaceous peat in high latitude cold and dry environment have light hydrogen isotopic composition and heavy carbon isotopic composition. The 未 D values of methane, ethane and propane decreased by -17 鈥，

本文編號：1920491