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冀中坳陷古近系始新统沙河街组三段中亚段地层全区广泛分布,在钻井、岩心和地震资料等定性和定量资料基础上,运用灰色关联分析方法得到的各单因素关联主因子,优选出5类与沉积相域展布有关的影响因素:地层厚度、粗碎屑岩含量、细碎屑岩含量、红色泥岩含量及暗色泥岩含量.在此基础上,采用单因素分析多因素综合作图法,编制了各层序格架下的岩相古地理图.冀中坳陷古近系沙三中亚段主要发育的沉积相,包括冲积扇、河流、(扇)辫状河三角洲、近岸湖底扇及湖泊.研究结果表明:沙三中亚段主要发育大型冲积扇河流-(扇)辫状河三角洲湖泊沉积体系,并处在冀中坳陷始新统早期的湖盆断陷扩张深陷期沉积这一演化阶段.
Based on qualitative and quantitative data such as drilling, core and seismic data, the single factor correlations obtained by the gray relational analysis method are widely distributed in the middle part of the Member 3 of the Middle Paleogene of the Early Paleocene Shahejie Formation in the Jizhong Depression. Five main influencing factors related to the distribution of sedimentary facies are selected as the main factors: formation thickness, coarse clastic rock content, fine clastic rock content, red mudstone content and dark mudstone content.On this basis, using univariate analysis According to the multi-factor comprehensive mapping method, the paleogeographic maps of lithofacies under various sequence frameworks were compiled.The sedimentary facies mainly developed in the Middle Triassic of the Middle Triassic in the Jizhong Depression include alluvial fans, rivers, River delta, nearshore fan and lacustrine.The results show that the sedimentary system of large-scale alluvial-fan delta-braided river delta lake mainly develops in the middle section of the Third Member of the Third Member of the Third Member of the Third Member of the Third Member of the Third Member of the Third Member of the Third Member of the Central Plains, Lake basin faulted depression deep depression sedimentary evolution of this stage.