2 , by detailed studying of sedimentary microfacies , guan 3 - 6 beds mainly belong to high crooked fluvial deposition system , and some parts of guan 5 - 6 show plait fluvial deposition system features : detailed divided them into edge beach , center beach and natural levee etc . 9 deposition microfacies and beach ridge and groove microficies 2 、通过沉积微相多层次逐级细分研究，认为馆3 - 6砂层组主要属于高弯曲度曲流河沉积体系，馆5 6部分小层表现为辫状河沉积体系；并细分出了边滩、心滩以及天然堤等九种沉积微相，以及滩脊和凹槽等微微相。
Furthermore , sorting of the sandstones in the braided river is better compared with that of in the meandering river system . in the same subfacies , grain size is larger and sorting is better in the channel sandstones which developed with large - scale cross - beddings such as trough cross - bedding , compared with sandstones in the flood microfacies . in the same microfacies , better sorting and coarser grained sandstones are distributed in the middle and lower part of the unit 与曲流河亚相相比，辫状河亚相砂岩的粒度较粗，分选性较好，砂体多次叠置而规模更大；相同河流亚相的河道微相与泛滥平原微相相比，前者的砂岩粒度较粗、分选性较好，发育槽状交错层理等大型层理构造；在同一微相内，处于中下部的流体单元其粒度较粗，分选较好。
The sediments of the incised valleys show an upward - fining succession , and can be grouped into four sedimentary fades : gravel lag - deposit of in - channel to partly over bank sediments of a meandering river , flood plain - estuary , estuary - shallow marine , and estuary sand bar , based on lithology , paleontology , and sedimentary textures and structures 根据岩石学、沉积结构和沉积构造特征，本区下切河谷充填沉积物具有向上变细的沉积层序，可以划分为4个沉积相类型：河床滞留沉积物到部分曲流河沉积体系的边滩沉积、河漫滩河口湾沉积、河口湾浅海沉积和河口湾砂坝沉积。
The border facies did not appear at the south edge of tiaohu seg . in the basin , the braided river facies and braided delta facies were only found at the foot of chahaquan palaeohigh in the west - south edge of the basin , the meandering delta was found from mazhong structural belt to fangfangliang horseback , and the other area were found covered by the shallow and fairly deep lake facies 条湖凹陷南缘芦草沟组未见边缘相沉积；岔哈泉古隆起处见少量辫状河相及辫状河三角洲相沉积；方方梁凸起东部至马中构造带发育曲流河三角洲相；其余地区则均为滨浅?半深湖相沉积。
