【摘要】 通过郭家滩勘查区含煤地层岩心沉积学分析,认为延安组一至五段沉积体系为前积型湖泊三角洲相沉积、浅水湖湾相沉积、浅水三角洲相沉积、三角洲前缘或湖湾相沉积、三角洲前积相沉积、三角洲前缘与平原过渡相沉积、河流三角洲平原相。矿区内各煤组煤层不仅受沉积环境的影响,还受到后期构造和砂体冲刷的影响,其中2~#煤组受到不均匀沉降及直罗期古河流冲刷作用,煤层分叉,剥蚀严重,同时各煤层底板均为走向北北东,倾向北西西,显示了自富县组填平补齐的继承性沉积,反映了湖泊的水位上升下降和水位的进退结果。更多还原

【Abstract】 Through the sedimentary analysis of the coal-bearing strata in Guojiatan exploration area,the sedimentary system of the first to fifth sections of the Yan’an Formation was determined.The coal seams of each coal group in the mining area are not only affected by the sedimentary environment,but also affected by the later structure and sand body erosion.Because of uneven subsidence and flushing of ancient rivers,the No.2 coal group is severely bifurcated and denuded.The bottoms of each coal seam are all inclining to NNE and tending to NWW,which shows the successive deposits filled up by Fuxian Formation and reflects the rise and fall of Lake water level.更多还原