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粒度分析是沉积相研究中沉积相划分的重要手段,在沉积微相识别中的多解性问题解释中有重要参考价值,在搬运介质的能量和性质的研究以及区域沉积物搬运方式的确定等诸多方面也是行之有效研究方法。在以沉积相分析为参照的基础上,对所取岩心进行精细观察描述并利用取心井所获得的粒度分析结果对研究区沙三段砂岩的粒度特征进行分析和探究。研究成果显示,辫状主沟道微相主要呈典型两段式、三段式和复杂三段式组合特征;辫状分支沟道微相以多段式为其主要特征;水下分流河道微相则以两段式、三段式以及斜坡式三种类型组合为其特点;远砂坝微相为两段式和低斜多段式特征。
Particle size analysis is an important means for the demarcation of sedimentary facies in sedimentary facies research. It has important reference value in the interpretation of multi-solution problems in sedimentary microfacies recognition. The study on the energy and properties of the transport medium and the determination of sediment transport in the area Many aspects are also effective research methods. Based on the analysis of sedimentary facies, the granularity of the sandstone in the third member of the study area was analyzed and studied through the fine observation and description of the obtained core and the particle size analysis results obtained by the coring well. The research results show that the braided main channel microfacies are mainly composed of two-stage, three-stage and complex three-stage combination features; braided branch channel microfacies with multi-stage as its main characteristics; underwater distributary channel microfacies It is characterized by three types of two-stage, three-stage and slope-type combinations; the micro-facies of the distal-barrage are two-stage and low-slope multi-stage features.