【摘要】 煤的有机岩石学特征是沉积环境良好的辅助指标之一,鄂尔多斯盆地安塞油田延长统煤和碳质泥岩的有机岩石学研究结果发现,有机岩的宏观岩石学特征、显微组分组成及其组合关系、有机质的赋存状态等能够较好地揭示煤和碳质泥岩形成的沼泽古地理环境和沉积场所,区分了原地堆积的陆地森林泥炭沼泽、覆水森林沼泽、芦苇沼泽及异地成因的漂浮沼泽等4种沼泽环境,从而为三叠系延长统形成时期古湖岸线的确定、演变以及沉积相带的划分提供了重要的参考。更多还原

【Abstract】 The organic petrologic characteristic of coal is one of good assistant indices. The organic petrologic study of Yanchang coal and carbonaceous shale of Ansai oilfield in Ordos basin indicates that the macroscopic petrologic characteristic, maceral and composite relation of the biogenic rock as well as the occurrence of organic matter can be used to better reveal the marsh paleo-geographic environment and depositional site originated by the coal and carbonaceous shale. Also, the marsh environment is classified into autochthonous terrestrial peat bog, blanket bog, moss bog and allochthonous floating bog. These can be as a significant guide for determination and evolution of paleo-lake strandline at Yanchang series of Triassic and classification of the depositional facies.更多还原