席状砂

主要储集砂体为水道砂体，其次为席状砂体，其它砂体较少。

The main reservoir rock is water channel , then the sand sheet , others are less .

河流相堤岸亚相、浅水三角洲分流河道、三角洲前缘远河道与远砂坝、前缘席状砂、末端扇河道漫溢相储层物性次之。

The reservoir quality of bank of river facies , distributary channel of shallow delta , distal bar and distal channel of delta front , sand sheet , overbank of terminal fan take second place .

该区Es4段属于浅水湖泊三角洲沉积，骨架砂体为河道砂、河道间砂、前缘砂（席状砂）、远砂坝。

Es 4 in this area belongs to shallow lake deltaic deposit , with sandstone mainly of channel sand , interbasin sand , frontal sand and far bar .

不平坦的三角洲前缘席状砂&来自露头和地下的证据

Non-flattening Delta Front Sheet Sand & Evidence from Outcrops and Subsurface

远砂坝及前缘席状砂则相对较差。

The frontal sheet sand and far bar sand are relatively poor .

席状砂储层内部微观剩余油分布及影响因素

The distribution and influencing factors of microscopic remaining oil in sand sheet reser - voirs

东营组划分为东三段和东二段两套储层15个小层，其属于河流三角洲湖泊沉积体系，本区主要发育河口砂坝、前缘席状砂、前三角洲等微相类型。

This area mainly developed river mouth bar , delta front sheet sand and prodelta facies .

扇三角洲前缘，包括水下分支河道、河道间沉积及滨岸和席状砂沉积；

Fan-delta front , including underwater dis-tributary channel , inter-channel , shoreline and sheet-like sand sediments ;

研究表明，前缘席状砂是良好地油气勘探目标。

It is suggested that the front blanket sand in a fan-delta is a good target for petroleum exploration .

Ⅲ类储层以远砂坝和席状砂为主，在高水位体系域较为发育。

And type ⅲ reservoir is dominated by far sand bars and sheet sand which is developed in high systems tract .

前缘相又可进一步细分为水下分流河道亚相，前缘砂亚相和边缘席状砂亚相。

The frontier facies can be subdivided into underwater distributary channel subfacies , frontier sand subfacies and marginal sand sheet subfacies .

西部前缘带的三角洲前缘沉积微相包括前缘席状砂、远砂坝、三角洲前缘分流河道和河口坝等。

There are mat-shape sand , far bar , subwater channel and channel bar micro-facies for delta-front on west front belt .

主要沉积微相为水下分流河道、河口坝、远砂坝、席状砂、天然堤、决口扇等。

The main sedimentary microfacies comprise distributary channel , mouth bar , distal bar , blanket sand , natural levee and crevasse splay .

三角洲前缘亚相发育河口砂坝、前缘席状砂和水下水道3种微相。

The delta frontal subfacies developed 3 mirofacies : the river mouth sand dam , the frontal matting-like sand and the underwater channel .

前缘席状砂、河口坝、远砂坝等粒度相对较细，云母等软组分含量高，储集性能逐渐变差。

The fine granularity of sandstone and high mica content make the blanket sandstone , mouth bar and distal bar the bad reservoir .

大庆油田长春岭背斜带扶余油层沉积微相类型主要是三角洲前缘亚相带内的水下分流河道微相、分流间湾微相和席状砂微相。

The major oil pay zones in this area are formed by fluvial channel sandstones within the first and second layer of the Fuyu Formation .

浅水沉积层主要发育低位三角洲相，砂体类型主要有水下分流河道、河口坝、席状砂等；

The sedimentary facies of the shallow water sediments are low stand tract deltas , and the sands are sub-water tributary , estuarine bar and sheet sands .

泻湖相堡坝亚相、三角洲相前缘亚相以及滨海相席状砂亚相是砂岩储层分布和发育的最有利相带。

Sand bar sub-facies of lagoon , front delta , sheet sandstone of offshore sea are the best sedimentary facies belts for the oil & gas accumulation .

海底扇是深海重力流的产物，其沉积体系是水道充填沉积与舌形体（或席状砂体）的复合体。

Submarine fans are formed from sediment-gravity flows in deep - sea environment and can be defined as channel-fill and lobe ( or sheet sandbody ) complexes .

该区沉积相与油气分布关系分析表明，河口坝、远砂坝和席状砂微相是最有利的油气聚集带。

Relationship between sedimentary facies and hydrocarbon distribution shows that most favorable oil and gas accumulation zones occur in the mouth bar , distal bar and sand sheet .

研究区可作为储层的砂体主要为水下分流河道砂体、河口坝砂体、前缘席状砂砂体及远砂坝砂体。

Sand bodies served as reservoirs in the study area are mainly underwater distributary channel sands , channel mouth bar sands , front sheet bar sands and far bar sands .

砂体类型以三角洲前缘席状砂体和远砂坝砂体为主，砂岩以粉砂岩、泥质粉砂岩为主，泥质含量较高。

The types of sand bodies are mainly sand sheet and sand bar of delta front . The lithology of sandstone is mainly siltstone , and argillaceous siltstone , with high shale content .

储层特征：马更些三角洲盆地已证实的主力储层为中&上新统水下扇沉积的辫状沟道、席状砂、水下天然堤与漫溢砂岩。

Reservoir characteristics : Upper Miocene subaqueous fan deposition in the main reservoir of the Mackenzie Delta basin has been confirmed as braided channel , sheet sand , underwater natural levee and overflow sandstone .

大庆油田三角洲前缘席状砂解剖发现，即使在外前缘相带，席状砂仍然具明显的水道特征。

It is found by dissecting the delta front sheet sands in Daqing Oilfield that though it is at outer front facies belt , there exists obvious characteristics of a water course in sheet sands .

沉积微相发育有分流河道、分流河道间、席状砂、天然堤、决口扇、远砂坝等多种类型，主要以分流河道和分流河道间为主。

Sedimentary micro-facies develops distributary channel , distributary interchannel , sheet sand , natural levee , crevasse splay , far sandbar and so on , in which the mainly types are distributary channel and distributary interchannel .

通过分析该区块的地质及开发特点，发现聚合物驱后剩余油分布在断层遮挡区域、前缘席状砂相、井网不完善区域、中低渗透层段。

Detailed study of geological and production character indicated that the residual oil distributed in the area of the faulting shelter , the front edge of sand sheet sedimentary facies and the medium and low penetrative layers .

曲流型分流河道驱油效率最低，顺直型分流河道驱油效率最高，三种类型的席状砂驱油效率居中。

The oil displacement efficiency of meandering type of distributary channel was the lowest , while that of straight distributary channel was the highest , with that of the three categories of blanket sands at the middle .

在冰消期海侵的初期，海水对南黄海东侧陆架早期沉积物的侵蚀和改造形成了滞留砂砾层、席状砂和潮流沙脊。

During the early post glacial transgression , sea water erosion and reworking on early deposited sediments in the eastern shelf of the South Yellow Sea resulted in lag sand gravels , sheet like sands and tidal sand ridges .

在此基础上结合物性以及试油成果，确定物性及含油性最好是水下分流河道，河口砂坝次之，前缘席状砂相对较差。

According to the core analysis and well-test results , the submerged distributary channel was believed to be the main reservoir microfacies , debouch bar was the poor reservoir , and front sand sheet was worse reservoir relatively in this area .

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 .