黄骅坳陷上古生界煤系烃源岩生烃潜力评价

EVALUATION OF HYDROCARBON GENERATING POTENTIAL OF THE UPPER PALEOZOIC COAL-BEARING SOURCE ROCK

热模拟实验结果表明,黄骅坳陷上古生界煤和煤系泥岩均具有较强的生气能力,是两套高效的气源岩。热解气均以干气为主。进入高演化阶段后,煤的生气能力要大于泥岩的生气能力,因此,尽管上古生界煤层的厚度远小于泥岩的厚度,但其生气能力不可忽视;煤具有较高的生油潜力,液态烃最高产率达到36·99mg/g,具有形成煤成油藏的潜力。而泥岩的液态烃产量有限,不足以形成有产量的油藏。利用热模拟实验的结果,结合盆地热演化史,计算出黄骅坳陷内两个重要古潜山地区蕴含的资源量相当可观,指示本区古生界良好的勘探前景。

The results of pyrolysis experiments show that the upper Paleozoic coal and mudstone in the Huanghua Depression all have larger gas producing capacity.Pyrolysis gases of the source rocks dominated by dry gases.The gas producing capacity of mudstone at 480℃ is lower than that of coal,it is predicted that the difference is more obvious at higher temperature,So the gas producing capacity of coal should be pay more attention.The coal has a higher hydrocarbon generation potential.The highest yield of liquid hydrocarbon is 36.99mg/g,but the mudstone can yield a small quantity of liquid hydrocarbon that can't form the prolific reservior.Combining the results of pyrolysis experiments with the evolution history of the basin,the quantificational calculation results implicates that the resources of the two main buried hills are considerable,showing the favorable exploration prospect.