鄂尔多斯盆地环县地区延安组煤系地层沉积环境分析

Analysis of Sedimentary Environment of Coal Measures Strata in Yan′an Formation in Huanxian Area,Ordos Basin

在大量野外地质调查及测井资料分析的基础上,将研究区延安组地层划分了6个煤层组。从古气候、古微地貌、古水体及盆地演化等方面进行煤层地质意义讨论,认为温暖、潮湿特征的气候有利于植物生长,地势平坦的低洼地区易于沼泽化,三角洲平原河道的分流作用及侧积作用有利于有机物的积累,盆地长期的构造沉降和有机物堆积的良好匹配关系有利于厚层煤的形成。

Based on the analysis of a large number of field geological surveys and logging data, divides the Yan＇an formation in the study area into six reservoir groups. The significance of coal seam geology was discussed in terms of paleoclimate, paleo-geomorphology, paleo-water and basin evolution, etc. It is believed that warm and humid climates are conducive to plant growth, low-lying areas with flat topography tend to form swamps, and diversions of rivers in the delta plains. The lateral product effect is beneficial to the accumulation of organic matter. The long-term structural subsidence of the basin and the good matching of organic matter accumulation are favorable to the formation of thick layer coal.