收稿日期: 2015-05-07
修回日期: 2015-08-25
网络出版日期: 2015-11-20
基金资助
2013年中国科学院油气资源研究重点实验室开放基金(编号：Y303KF1YJG)；国家科技重大专项(编号：2011ZX05000-01-06)；甘肃省重点实验室专项(编号：1309RTSA041)联合资助.
The Characteristics of Depositional Facies and Their Influence on Reservoir Properties in Fudong Slope,Junggar Basin
Received date: 2015-05-07
Revised date: 2015-08-25
Online published: 2015-11-20
通过对阜东斜坡区24口探井的侏罗系三工河组岩心的详细观察和描述，将其划分为7个岩相，分别为砾岩相、砂砾岩相、粗砂岩相、中砂岩相、细砂岩相、粉砂岩相及泥岩相。在岩相划分基础上，结合薄片鉴定、测井及录井资料的分析，建立了水下分流河道、水下分流河道间、席状砂和滨浅湖泥4个沉积微相的沉积序列，包括各微相沉积序列的岩相组合特征、曲线形态及层理构造等。据此，完成单井相、连井相及平面相的绘制，实现对阜东斜坡区侏罗系三工河组沉积相研究。研究区主要发育辫状河三角洲前缘亚相沉积，自三一段到三二段再到三三段各沉积微相展布不同，水体显示为水退再水进的过程。而湖岸线的变化不明显，说明在三工河组沉积时期构造较稳定，水体振荡微弱，砂体厚度受控于沉积物的供给，在三二段砂体发育最厚，三一段次之，三三段的沉积物供给量不足，砂体以席状砂为主。沉积作用对阜东斜坡侏罗系三工河组储层物性控制明显。水下分流河道以及席状砂微相水动力条件强，所发育的储集岩分选好，泥质杂基含量低，不仅发育大量的原生孔隙，还常见碳酸盐岩胶结物发育，使得储集岩孔隙受压实作用破坏相对较少，并且碳酸盐胶结物可发生溶蚀，进而保留大量的粒间孔隙。
殷建国，刘旭，白雨，刘军，康莉，张顺存 . 准噶尔盆地阜东斜坡区沉积相特征及其对储层物性的控制作用[J]. 天然气地球科学, 2015 , 26(S2) : 23 -32 . DOI: 10.11764/j.issn.1672-1926.2015.S2.0023
After detailed description of cores in 24 wells,rocks of Jurassic Sangonghe Formation developed in Fudong slope are divided into 7 lithofacies,i.e.,conglomerate rock facies,glutenite facies,coarse sandstone facies,medium sandstone facies,fine sandstone facies,siltstone facies,and mudstone facies.Based on lithofacies,sedimentary sequences of underwater distributary channel,underwater inter-channel,sheetstone microfacies are established in virtue of integrated analysis of sections and well logging,including characteristics of lithofacies association of each microfacies,logging patterns and sedimentary structures.And then the research on deposition of Jurassic Sangonghe Formation is carried out through depiction of single well facies,profile facies,and plane facies.Braided river delta frontier,mainly developed in the study area,appears as water progression to water retreat from first section to second section and then to third section of Sangonghe Formation.Unconspicuous variation of lake shoreline implies steady tectonics and weak fluctuation of water in Sangonghe Formation,consequently that sandstone thickness is mainly controlled by sediment supply.Sandstone thickness tapers from second section to first section then to third section for gradually reducing sediment supply.Reservoir properties are obviously controlled by deposition.Well sort and low mud content of reservoir rocks in underwater distributary channel and sheetstone for powerful water force make them develop abundant primary porosity and offer formation condition of carbonate cements,which can offset compaction,then retain intergranular volume because of subsequent solution.
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