用显微组分的双重属性研究沉积有机相

沉积有机相是近年来国内、外广泛运用于油、气勘探的一种有效的研究方法。沉积有机相的区分主要依据源岩有机质的地球化学性质和光性特征。实际上,源岩显微组分的特征、类型、数量和产状是源岩有机质的岩石学和地球化学特征的双重反映,并和沉积环境密切相关。因此,利用源岩显微组分的属性可以简便快速地确定沉积有机相,并可更好地反映盆地内油气资源的分布状况。根据该方法对准噶尔盆地和吐鲁番-哈密盆地侏罗纪煤系的沉积有机相进行研究,圈定了有利的煤成油相带。

A NEW METHOD OF STUDYING SEDIMENTARY ORGANIC FACIES BY MEANS OF MACERALS' DUAL NATURE

Sedimentary organic facies has been extensively applied to gas and oil exploration in recent years. It is usually divided based on the organic geochemical method combined with the optical characteristics of organic matter. In fact, the character, types, composition, abundance and vit-rinite reflectance of source rock macerals can display hydrocarbon-generating conditions and sedimentary environment; therefore, sedimentary organic facies may be quickly determined based on organic petrology and organic geochemistry of macerals. The authors have studied Jurassic sedimentary organic facies in the Junggar and Turpan-Hami basins with the above method, and four sedimentary organic facies types have been distinguished; they are high moor organic faices, forest-swamp organic facies, running water organic facies and open water facies, of which running water organic facies is the best liquid hydrocarbon-generating organic facies for the production of oil from coal.