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通过详细的岩芯观察、录测井资料分析,并结合区域地质资料和前人研究成果,对白音查干凹陷下白垩统都红木组的沉积相特征和沉积演化进行了深入研究。结果表明,白音查干凹陷主要发育扇三角洲相、辫状河三角洲相、浊积扇相和湖泊相4种沉积相类型。其中,扇三角洲和浊积扇在陡峭的北坡发育,辫状河三角洲在宽缓的南坡沉积,湖泊相分布在扇三角洲和辫状河三角洲的侧翼及凹陷的中心。都红木组沉积时期白音查干凹陷处于强裂陷向坳陷转化阶段。根据残留地层分布特征,其沉积演化可分为早、中、晚3个时期,从早期至晚期,扇三角洲和辫状河三角洲的面积不断缩小,分别后退了约3km和4-11km,湖泊沉积成为主体。
Through detailed analysis of core observation and well logging data, combined with regional geological data and previous research results, the sedimentary facies characteristics and sedimentary evolution of the Lower Cretaceous Duhumu Formation in the Baiyinchagan depression have been deeply studied. The results show that the Baiyinchagan depression is mainly composed of fan delta facies, braided river delta facies, turbidite fan facies and lacustrine facies. Among them, fan delta and turbidite fan developed on the steep northern slope, braided river delta was deposited on the gentle south slope, and lacustrine phase was distributed on the flanking and depression center of fan delta and braided river delta. Baiyinchagan Sag during the sedimentary period of the Mahogany Formation is in the transition from strong rifting to depression. According to the characteristics of the residual stratigraphic distribution, the sedimentary evolution can be divided into three periods of early, middle and late. From early to late, the area of fan delta and braided river delta has been shrinking, and the sedimentary evolution has been receded by about 3km and 4-11km respectively, Become the main body.