曲流河沉积

从沉积学的角度重建了第V成因单元的沉积体系，识别出两种沉积体系，分别是位于研究区西北部的辫状河沉积体系和东南部的曲流河沉积体系。

According to sedimentology , the depositional system of Unit V , Yan'an Formation , has been reconstructed , it is revealed that there is braided stream system in the northwest of study area , and meandering stream system develops in the southeast .

S1和S2旋回主要为辫状河沉积；S3旋回早期以曲流河沉积为主；

The S1 and S2 cycles are mainly composed of braided river facies , the early S3 cycle of meandering river facies and the late S3 and S4 cycles of delta facies .

研究区沉积相模式与经典的曲流河沉积模式极为相似。

The sedimentary model in study area is similar with classical meandering stream .

描述了齐北地区河流相各沉积微相特征，并建立了高弯度曲流河沉积模式和低弯度曲流河沉积模式。

The stream facies are divided into high curved meandering stream facies and low curved meandering stream facies .

河流沉积体系展布于研究区北部，发育于山西组的早期和晚期，以曲流河沉积为主，辫状河沉积不仅分布范围极其局限，而且发育的时限很短。

Fluvial system is distributed at the north part of the study area , developed during early and late period of Shanxi formation .

曲流河沉积以发育点砂坝、决口扇、天然堤和泛滥平原等微相单元为特征。

The depositional sequences of meandering river are typical of the development of point bars , crevasse-splays , natural levees and flood plains .

研究表明延安组从下到上依次经历了曲流河沉积体系-三角洲沉积体系-曲流河沉积体系，反映出了鄂尔多斯盆地的一次鼎盛发育期。

It suggests that Yanan formation experiences meandering river system-delta system-meandering river system from bottom to top , reflecting a peak growth period in ordos basin .

胜利油区老河口油田的馆上段为典型的河流相油藏，主力含油层系存在曲流河沉积和网状河沉积。

Upper Guantao formation in Laohekou oilfield of Shengli oil province is a typical reservoir of fluvial facies with major oil-bearing system containing meandering and braided river sedimentation .

泉四段沉积时期，研究区内没有统一的汇水中心，同样以河流-末端扇沉积为主，研究区西北部发育辫状河扇-曲流河沉积。

There is no unitary water catchment center in the fourth member of Quantou formation , river-terminal fan sediment is the major sedimentation type , braided river fan-meandering river develops in the northwest of research area .

根据相标志分析，储层为曲流河相沉积，发育曲流河点坝、决口扇、天然堤及泛滥平原四种沉积微相类型。

Through the analysis of facies marker , the reservoir is meandering river facies . The facies are classified into four microfacies , i.

表明此时主要为水动力较强的山前盆地、低弯度曲流河的沉积环境，物质主要来自于邻近山地的贫磁性母岩。

Author suggest a sedimentary environment of foreland basin or low sinuosity meandering river with strong hydrodynamics and sediment provenance mainly from the adjacent mountain .

曲流河相沉积砂体由于其单层薄、横向上不稳定、变化大等特点，给实际的石油勘探开发和预测工作造成了很大的困难。

The oil exploration , development and reservoir prediction for meandering stream sandstone bodies meet lots of difficulties because of their single thin layer , transverse instability and great variations .

渤海湾盆地上第三系发育着大量的曲流河相沉积砂体，它们在中国东部的油气储量和产量中占据着重要的地位。

There exist a lot of Neogene meander sand bodies in Bohai Sea basin , and they give an important share of hydrocarbon reserves ( or production ) in the east part of China .

研究表明，山西组山2~3段为曲流河三角洲沉积，下石盒子组盒8~2段、盒8~1段为辫状河三角洲沉积。

The research as follows that Shan_2 ~ 3 Member is meandering stream delta facies , Heg and Heg are both braided stream delta facies .

勘探实践表明，曲流河三角洲沉积体系对于研究区天然气的富集有着更为重要的作用。

Exploration practices show that the meandering river delta sedimentary system would have played a more important role in gas accumulation in the study area .

东北部以曲流河三角洲沉积体系为主，西南部以辫状河三角洲沉积体系为主，湖盆中部发育大规模的深湖浊积扇体。

The meandering river delta sedimentary system was mainly distributed in northeast portion , and the braided river delta sedimentary system in southwest portion . Meanwhile deep-lake turbidite fan was developed in the centre of the lake basin .

曲流河凹岸滩坝沉积模拟研究

Concave bank Beach Bar Deposition of Meandering River

该区沉积上属于曲流河三角洲前缘沉积，主要有利沉积微相类型为水下分流河道和河口坝。

Deposited on the area are meandering river delta front , the main type of favorable sedimentary facies of underwater distributary channel and mouth bar .

取得以下主要认识：1、研究区属于辫状河&曲流河三角洲前缘沉积，发育有水下分流河道、河口坝、分流间湾、前缘席状砂等沉积微相。

The main conclusions run as follow : ( 1 ) The depositional system in study area belongs to braided-meandering river delta front deposit . The microfacies developments of underwater distributary channel , mouth bar , distributary bay and front sheet sand facies .

沿盆地长轴方向，在坡降缓、斜坡长的古地形等条件下，源远流长地巨大的定向曲流河携带大量的泥沙进入湖盆，在河湖作用过渡带形成曲流河三角洲沉积体。

The immense oriented meandering river , along the long axis of the depression and with the gentle declivity and long slope , carried a large amount of mud and sand into the lake basin .

曲流河三角洲主要发育在早二叠世山西组山2段气层组，以曲流河三角洲前缘沉积为主。

While the meandering river delta deposits are mainly developed in Shan-2 gas-bearing unit in the Upper Permian Shanxi Fm , with the meandering river delta front subfacies in predominance .