Studying grain size can clearly define the nature and energy of the transportation medium,determine the mode of sedi-ment transportation,and thus provide basis for the division of sedimentary facies.On the basis of drill core observation,and ana-lyses of facies and grain size,features of probability cumulative grain size curves of the lower Es2 in Wen 79 fault-block of Wenliu district in Dongpu Depression are summarized.Results show distributary channel microfacies is of typical bi-or tri-segmental pat-tern,and high slope 1 bouncing population-1suspension-transitional zone pattern;proximal overbank microfacies tends to be bi-segmental pattern and 2 bouncing populations-1 suspension-transitional zone pattern and 1 bouncing population-1 suspension-tran-sitional zone pattern;distal overbank microfacies shows a single segmental pattern and low slope multi-segments pattern and ex-cessive suspension population pattern.%研究粒度可以明确搬运介质的性质和能量，确定沉积物的搬运方式，为沉积相划分提供依据。在岩心观察描述和沉积相分析的基础上，利用取心井粒度分析资料对东濮凹陷文留地区文79断块沙二下亚段砂岩的粒度概率累积曲线进行研究。结果表明，该研究区主要沉积环境粒度概率累积曲线特征为：分流河道微相有典型的两段式或三段式和“高斜一跳一悬夹过渡式”的组合特征；近河道漫溢微相有两段式和“两跳一悬夹过渡式”以及“一跳一悬夹过渡式”；远河道漫溢微相有简单一段式和“低斜多段式”及“细粒高悬加过渡式”。
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