【作者】 张勇； 国景星；

【Author】 ZHANG Yong~1,GUO Jing-xing~1 (School of Geosciences,China University of Petroleum,Qingdao 266555,Shandong)

【机构】 中国石油大学(华东)地球科学与技术学院；

【摘要】 通过岩心观察分析,结合丰富的测井资料,对大芦家地区馆三段辫状河相隔夹层的类型、特征进行分析,将该区隔夹层按岩性划分为泥岩隔夹层、钙质隔夹层和过渡性隔夹层;按层次结构和发育规模划分为砂层组间、单砂层间、成因体间3个级次。进而刻画各个级次隔夹层在辫状河沉积微相背景的空间分布,从而探索其展布规律。研究发现辫状河相5级隔夹层厚度大且全区分布稳定;4级隔夹层以钙质和过渡性为主,在心滩和河道充填微相一般厚度较小,道间滩地和漫滩微相厚度较大,隔夹层倾角在迎物源方向较陡,背物源方向较小,伴随辫状河的演化,其厚度和规模均增大;3级隔夹层主要是钙质成岩作用成因,一般零星发育在河道充填和心滩微相砂体中上部的沉积微相接触带;伴随辫状河沉积的演化,具有厚度增大、夹层数目增多和泥质/钙质夹层比例增大的趋势。更多还原

【Abstract】 Based on the analysis of the core observation and the comprehensive logging data,types and characteristics of interlayers of the third member of Guantao formation in Dalujia area were studied. Interlayers in Braid River are mainly divided into mudstone interlayer,calcareous interlayer and transitional interlayer.There are three hierarchies,including the barrier beds between sand groups,between single sand beds,and the interbeds in single sand beds.The profile and plane distribution of interlayers were studied against the background of sedimentary microfacies to study spatial distribution regularities of interlayers. The study show that the fifth hierarchies interlayers are extensively distributed in research area with great thickness.The forth hierarchies interlayers are mainly calcareous and transitional interlayers characterized by little thickness in Channel bar and Channel sand bodies microfacies,lager thickness in bottomland between channels and bottomland and big dip angle near the source direction and small dip angle in the inverse direction.The thickness and scale of the forth hierarchies interlayers increased with the braided river evolution.The third hierarchies interlayers are mainly calcareous and sidtribute in the middle and top of Channel sand bodies and Channel bar which contact with other microfacies.With the braided river evolution, the third hierarchies interlayers had a trend of greater thickness,more numbers and greater mudstone interlayers/ calcareous interlayers ratio.更多还原