瓦窑堡煤系有机岩石学特征及煤成烃潜力研究

瓦窑堡煤系是我国重要的含煤岩系之一,陆相生油的观点最早可能源于瓦窑堡煤系含油性特征。通过对瓦窑堡煤系煤和暗色泥岩有机质的显微岩石学和宏观煤岩学特征的分析,提出了瓦窑堡煤系煤主要形成于深覆水森林泥炭沼泽相,类脂组含量高,且镜质组的主要类型为富氢的基质镜质体,有机地球化学结果表明瓦窑堡煤系煤具有Ⅱ型有机质的特征,处于低熟-成熟阶段,热模拟实验证明其具有良好的油气生成潜力。但由于瓦窑堡煤系规模小,煤层厚度薄,煤系泥岩有机质类型偏差,且煤中主要生油显微组分尚末进入大量生油期,因此难以形成油藏。

Characteristics of Organic Petrology and Hydrocarbon-generating Potential of Wayaopu Coal Measures

Wayaopu coal formation is one of the most important coal formations and the earliest idea of oils from terrigenous deposit possibly origin ated from it. Based on the research results of the organic petrology and coal petrology, it is fromed to peat bog facies in deep underwater forest, the coals contain high-content liptinites, and the desmocollinites are the main type of vitrinite group of the coals and the desmocollinites have higher petroleum potential. Organic geochemistry shows that the kerogen type of WaYaoPu coal formations is Ⅱ, lower-middle maturity. The result of thermal simulation experiment on the coal shows that the coal has higher oil production, but it is difficult to form industrial oil-gas accumulation because of the low potential oil generating ability of the darker mudstones and the low maturity of the main macerals in the coal, and small scale and thin coal-beds of the coal in spite of its high potential oil generating ability.