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通过对吐哈盆地7个油砂样连续抽提研究,结果表明自由态组分、油气包裹体和黏土吸附油气组分分子地球化学特征具有明显的差异.油气包裹体和黏土吸附油气组分具有明显的湖相泥岩地球化学特征:(1)较高的Ph/nC_(18)比值和较低的Pr/Ph比值;(2)较高的C_(26)三环萜烷/C_(24)四环萜烷、C_(23)三环萜烷/(C_(23)三环萜烷+C_(30)17α(H)藿烷)、C21/(C_(21)+∑C_(29))甾烷、Ts/Tm和C_(29)Ts/C_(29)17α(H)降藿烷比值和较低的C_(19)/C_(21)三环萜烷比值;(3)相对较高的C_(27)和C_(28)规则甾烷含量和较低的C_(29)规则甾烷和重排甾烷含量.表明早期注入这些油层的油气组分来源于前侏罗系湖相泥岩,晚期注入的油气组分来源于侏罗系煤系地层或煤岩.
Through continuous extraction of seven oil sands in the Turpan-Hami basin, the results show that there are obvious differences in molecular geochemical characteristics of free-oil components, oil-gas inclusions and clay adsorbed on oil-gas components. The obvious characteristics of lacustrine mudstone are: (1) the higher Ph / nC_ (18) ratio and lower Pr / Ph ratio; (2) the higher C_ (26) tricyclic terpane / C_ (23) tricyclic terpanes / (C_ (23) tricyclic terpanes + C_ (30) 17α (H) hopane), C21 / (C_ (21) + ΣC_ (29)) (29) 17α (H) n-hopane ratio and a low C 19 / C 21 tricyclic para-alkane ratio for the steranes, Ts / Tm and C 29 Ts / C 29 et al. The C_ (27) and C_ (28) regular steranes and the low C_ (29) regular steranes and rearrangement steranes show that the oil and gas components injected into these reservoirs in the early stage originated from the former Jurassic lacustrine mudstone The late-injected hydrocarbon components come from the Jurassic coal-bearing strata or coal rock.