沉积界面控制的三角洲前缘精细地层对比方法  

STRATA CORRELATION OF DELTA FRONT ACCURATE RESERVOIR CONTROLLED BY DEPOSITIONAL INTERFACES

作　　者：严科[1,2] 毕义泉[3] 赵红兵[2] 

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

出　　处：《西南石油大学学报（自然科学版）》2011年第5期35-40,190-191,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石化集团公司十条龙项目"胜利油区主力油田注水开发关键技术研究"(P06078)

摘　　要：针对三角洲前缘岩性变化大,旋回性对比易产生多解性的问题,以东营凹陷胜坨油田沙二段8砂组三角洲前缘为例,提出了以沉积界面为约束的精细地层对比方法。将三角洲前缘地层中的沉积界面按规模大小划分为五级,采用沉积界面逐级识别和界面趋势逐级借鉴的原则,通过五级界面的识别与对比建立复合成因砂体格架,通过四级、三级界面的识别和对比建立单一成因砂体及增生体格架。研究表明:三角洲前缘地层中各级沉积界面的分布主要受古地形控制,且具有继承性,在古地形平坦条件下以近水平产状为主,在坡折带则以倾斜产状为主。受沉积界面控制,三角洲前缘复合成因砂体、单一成因砂体以及增生体总体上表现为低角度前积特征,但在坡折带具有高角度前积特征。利用沉积界面逐级对比方法建立的地层格架具有沉积学的意义,能够客观反映三角洲前缘对湖盆的充填过程。There are some ambiguities in cyclic strata correlation of delta front reservoir because of the variegatedlithologic character.For example,the Es2(8)sand sets of Shengtuo Oilfield which is a typical delta front reservoir,the method of strata correlation controlled by depositional interfaces was proposed.The depositional interfaces ofIV Journal of Southwest Petroleum University(Science & Technology Edition) Oct.2011delta front reservoir can be classified into five hierarchies,which controlled the building of the strata frameworkby identifying the depositional interfaces and referring the trend of interfaces step by step.The fifth hierarchydepositional interface was used to control the building of the composite sand body framework.The single genesissand body and accretion sand body framework can be built by identification and correlation of the fourth and thirdhierarchy depositional interfaces.The study shows that the distribution of the depositional interfaces in the deltafront reservoir has inherited structure controlled by palaeotopography.The attitude of the depositional interfaces isalmost horizontal on the condition of flat palaeotopography,but be acclive on the slope break belt.Controlled bydepositional interfaces,the composite sand body,the single genesis sand body and the accretion sand body havelow-angle foreset architecture as a whole,but have high-angle foreset architecture on the slope break belt.The strataframework built by interface correlation step by step has sedimentological significance,which reflected the fillingprocess of the lake basin clearly.

关 键 词：三角洲前缘 地层对比 沉积界面 建筑结构 胜坨油田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]