东濮凹陷文79断块沙二下亚段沉积环境粒度概率累积曲线特征

Studying grain size can clearly define the nature and energy of the transportation medium, determine the mode of sediment transportation, and thus provide basis for the division of sedimentary facies .On the basis of drill core observation ,and analyses 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 pattern, 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-transitional zone pattern; distal overbank microfacies shows a single segmental pattern and low slope multi-segments pattern and excessive suspension population pattern.