塔东北地区白垩系辫状河沉积特征研究

Characters of the Braided River Deposits of the Cretaceous,Northeastern Tarim Basin

根据沉积构造、沉积层序特征及测井剖面对比分析,对塔东北地区白垩系的沉积相进行了研究,认为该地区为辫状河沉积,明确了辫状河沉积相的时空展布和变化规律。研究表明,白垩系沉积时期,古水流由塔东北地区的北部隆起和南部高地向中间低洼地区汇集,在整个地区广泛分布辫状河道、河间砂坝及漫滩沉积微相,储集层主要为辫状河道和河间砂坝砂砾岩和中粗砂岩。沉积构造主要有各种层理构造和侵蚀构造。储集层常见单一河道层序、河道-砂坝复合体及多层楼式河道沉积层序。

The sedimentary facies of the Cretaceous in the Northeastern Tartm basra are mterpreted jointly with sedimentary structure, characters of sedimentary sequence and logging data. The main sedimentary microfacies include braided river, channel bar and floodplain deposits. The lithology of reservoir mainly consists of conglomerate and middle-coarse sandstone. All kinds of stratification structure and corrosive structure are very abundant. The sedimentary sequences of monotonous river, compound channel and channel bar, multiple storey are often developed in the area.