辽河坳陷双台子构造带沙三段沉积相展布特征与沉积主控因素

辽河西部凹陷双台子构造带E₂s₃发育重力流沉积，沉积相类型为湖底扇中扇和外扇，同沉积断层和古地貌是控制沉积的主要因素。论文描述了同沉积断层和古地貌的展布特征，并以此为基础，开展了沉积相主控因素的研究工作。建立了“沟道控砂，坡度控形，物源控供给”的沉积模式:辫状沟道沉积分布在受同沉积断层和古地貌的联合控制的古沟道内。古地貌坡度小，辫状沟道沉积向盆地中心搬运的距离长，沟道弯曲度大，沉积分异作用更加明显，盆地内主要以砂岩与泥岩互层为特征（双南）。古地形坡度大，辫状沟道沉积向盆地中心搬运距离短，沟道弯曲度小，沉积分异作用差，盆地内主要以厚层砂岩和薄层泥岩组合为特征（双台子）。双台子和双南具有不同的物源，两个地区在同一层序内具有不同的砂体叠置样式。双南和双台子沉积作用机制上的不同，导致了二者在沉积相带展布、砂体叠置样式等方面的差异。对储集体而言，双台子比双南具有更有利的沉积相带。

Characteristics of Main Sedimentary Facies Distribution and Depositional Controls of E2s3 in Shuangtaizi Structure Belt,Liaohe Depression

There are gravity flow sediment in the third section, Shahejie Formation, Eocene in Shuangtaizi Structure Belt, Liaohe depression. Middle fan and outer fan are the main types of sedimentary facies. Growth fault and palaeogeomorphology co-controlled the deposition, and their distribution characteristics are depicted. Then, sedimentary facies controlling factors are studied. A sedimentary model that channel controlled distribution of sand, slope gradient controlled shape, and provenance controlled supplement of sediment  is built up. Braided channel is controlled by growth fault and paleogeomorphology. Through the study of sedimentary facies, several results are concluded: in Shuangnan, as the slope of paleo-geomorphology is gentle, the transport distance of the braided channel sediments is long, the sinuosity is great, depositional differentiation is apparent, and the sediments characteristic is thin bed interbedding of sandstone and mudstone. However, in Shuangtaizi, as the slope of paleo-geomorphology is sharp, the transport distance of the braided channel sediments is short, the sinuosity is low, sedimentary differentiation is weak, and the sediments characteristic is interbedding of thick bed sandstone and thin bed mudstone. The differences of sedimentary mechanism between Shuangtaizi and Shuangnan make differences of the sedimentary facies distribution and sand body interbedding architectures in these two areas. Shuangtaizi has better sedimentary facies than Shuangnan, which is important to the reservoir quality.