摘要
西北中生界煤系烃源岩中普遍含有木栓质体，它来源于植物周皮的木栓化细胞壁。在株罗系煤的显微组分中，如仅以木栓化细胞壁计，木栓质体一般占２％以下，若与充填在细胞腔中的四块镜质体同计，则最高可达２０％左右。在Ｒｏ为０．３５％～０．７０％的热演化阶段，木栓质体光性变化明显，但形态、数量没有显著变化，反映在低成熟阶段木栓化细胞壁中明显失去木栓质和蜡质，而作为细胞壁格架的纤维素、木质化纤维素变化不大。随热成熟作用加深，木栓质体光性逐渐向结构镜质体和均质镜质体演化，至Ｒｏ达０．９０％已难分辨。木栓质体具有低成熟度成烃特点，但在西北中生界烃源岩中，由于其含量较低，并非是最重要的生油组分。
Suberinite occurs commonly in Mesozoic coal measures and terrestrial organic matter source rocks in Northwest China, which is formed from suberized cell walls, particularly in plant periderm. The proportions of suberinite in organic macerals are generally less than 2% if only suberized cell walls are counted,and can be maximized to about 20% in some cases if both suberized cell walls and corpocollinite which are contained within the cork cells are counted. In vitrinite reflectance range of 0. 35 %-0. 70% Ro, severe optical changes of suberinite are demonstrated, but its changes in morphography and content are insignificant. Those phenomena reflected that the suberin and wax fractions in suberized cell walls were obviously lossed in this stage, and the lignified cellulose and cellulose fractions as skeleton of cell walls exhibited indistinct changes. Suberinite are progressively evolved to telinite or telocollinite, in optical properties during thermal maturation, up to 0. 90% Ro, where suberinites were very hard to be identified. Suberinite shows early thermal degradation to generate hydrocarbon, its principal zone of oil formation was located in the range 0. 35%-0. 45% Ro. Suberinite were insubstantial oil generated macerals because the content of suberinite in organic matters are relatively low in Mesozoic source rocks in Northwestern China.
出处
《石油勘探与开发》
EI
CAS
CSCD
北大核心
1996年第1期7-11,共5页
Petroleum Exploration and Development
关键词
煤系
生油层
木栓质体
西北中生界
烃源岩
Coal measures, Oil source rock, Coal composition, Mesozoic era, Suberinite
