摘要
随着石油勘探的深入和发展，煤和含煤沉积的生油问题，已经越来越引起人们的重视。为此，笔者选择了准噶尔盆地侏罗系富氢组份含量高的煤样和富镜质组的煤岩样品，采用快速热解法，对其显微组份和全煤的热解生烃潜势进行了研究。结果表明：（１）Ｒ０值为０．３７～０．３９％的未成熟煤岩样品中，壳质组和镜质组在３５０～４５０℃温度区间有最大热解峰面积Ｓ２０（２）富氢组份含量高的样品中，热解产物以正构烷烃＋正构烯烃为主，其次为芳烃化合物。（３）镜质组或富镜质组的煤岩样品中，Ａ１６００／Ｍｇ值较高时，热解产物在Ｃ６—Ｃ１５范围内，某些芳烃化合物成为主峰。（４）惰性组生烃能力最差，在较高温度下，形成含量很低的正构烷烃和烯烃，或在气态烃范畴产生少量烃类，或基本不产生热解产物。（５）随着加热时间的延长或原煤样品演化程度的升高，烯烃含量减少或消失，可能是干酪根转化过程中的残余氢为烯烃的氢化作用提供了氢源，使烯烃转化为烷烃的缘故。
The queStion on oil generation in the ctal and coal-bearing deposit has attracted ever more geologist's attention already, with the strengthening of oil exploration.Jurassic strata are widespread in the Junggar Basin, being characterized by a large sedimentary area and a high percentage of coal. Until now, Known oil and po fields formed from coal measures include the Qigu field and some high-yielding .wells. In the southern margin of the ban, the total thickness of the lower and middle Jurassic series is about 2500m, of which the targest thickness of coal seams is 160￣238m, and that of individual coal layer reaches 40￣70. 47m Most. of coal layer numbers are more thAn 50. TO this end, the authors collected Jurassic coal sampled there,microscopic analysis indicates that they contain higher hydrogen-rich macerals and vitrinite. By using the flash pyrolysis method, the hydrocarbon potential of coal macerals and whole coals is studied. These resultS show: (1) the 350-450 ℃ phrolysates have the largest peak area (S2)which matches for oil-generating peak stage. (2) in samples of high hydrogen macerals, pyrolysis products have n - alkane and n - alkene as the predominant constituents, with aromatics next in abundance. (3) in vitrinite or vitrinite-rich coal samples, some of aromatics becomes major peak ranging from C8 to C15 for pyrolysis products. (4)the hydrocarbon - generating possiblity for the initinite is the lowest, at the higher temperature state, a low content of n-alkane and n-alkene or a trace amount of hydrocarbon was formed in the po-saate range, or pyrolysis products were not generated. (5)with the increasing of the heating time or sample evolutional level, the alkene content decreases or losts. Remnant hydrogen occured in kerogen transfotming process can serve as the hydrogen source for hydrogenation of the alkene, leading to the transformation of alkene to alkane.
出处
《沉积学报》
CAS
CSCD
北大核心
1994年第4期87-94,共8页
Acta Sedimentologica Sinica
