三角洲前缘砂体最佳解剖方向及内部结构特征——以东营凹陷胜坨油田沙二段8砂组为例  

The Optimum Anatomy Orientation and Inner Structure of Delta Front Sandbody——A Case Study of Es_2 8th Sand Formation in Shengtuo Oilfield

作　　者：严科[1] 毕义泉[2] 赵红兵[3] 

机构地区：[1]中石化胜利油田博士后科研工作站,山东东营257002 [2]中石化胜利油田分公司,山东东营257000 [3]中石化胜利油田分公司胜利采油厂,山东东营257051

出　　处：《石油天然气学报》2011年第10期37-42,165,共6页Journal of Oil and Gas Technology

基　　金：中国石油化工集团公司"十条龙"项目(P06078)

摘　　要：陆相湖盆中河流-三角洲沉积体系的形成具有方向性，明确物源方向有助于确定砂体的最佳解剖方向，从而揭示砂体内部结构特征。以东营凹陷胜坨油田沙二段8砂组三角洲前缘储层为例，综合利用重矿物组合法、砂岩分析法和砂体形态分析法，明确了单期砂体的物源方向及分布规律，选择最佳解剖方向，描述了水下分流河道和河口坝砂体的内部结构特征。研究表明，垂直物源方向是水下分流河道复合砂体的最佳解剖：护向，利用砂体顶面高程差异和沉积厚度差异可在大片分布的水下分流河道复合砂体中鉴别出多条单一河道，单一河道的侧向拼合和垂向叠置形成了水下分流河道复合砂体；平行物源方向是河口坝复合砂体的最佳解剖方向，可在砂体内部识别出3～5级沉积界面，各级沉积界面及结构单元的产状主要受沉积古地形控制，在坡折带具有高角度前积特征，在平坦的古地形条件下主要表现为近水平前积。The formation of river-delta depositional system had directivity.The provenance analysis could be used to confirm the optimum anatomy orientation and characterize the inner structure of the sand body with different geneses.By taking the delta front reservoir in Es2 8th Sand Formation of Shengtuo Oilfield for an example,the methods of provenance analysis including the heavy mineral combination,sandstone component analysis and sand body morphology were utilized comprehensively to describe the provenance orientation and distribution of single sand body.The optimum anatomy orientation was chosen to characterize the inner structures of subaqueous distributary channel and mouth bar in the delta front.The study shows that the vertical provenance direction is the optimum anatomy orientation of subaqueous distributary channel sand body,which is built up laterally and vertically by single channel.The elevation difference of top surface and the thickness difference of sand body are available to distinguish the different single channels.The provenance direction is the optimum anatomy orientation of mouth bar sand body,which contains multiple order depositional interfaces.The attitude of the depositional interfaces and structural units are controlled by palaeotopography,which presents high angle progradation in the slope break belt and near horizontal progradation in the flat terrain.

关 键 词：物源分析 解剖方向 建筑结构 水下分流河道 河口坝 胜坨油田 

分 类 号：P618.13[天文地球—矿床学]