摘要
海上油田开发井距大、井网稀,早期以小层为单元的构型研究已无法满足浅水三角洲储层开发后期剩余油挖潜精度要求。以渤海歧口油田明下段地层为例,利用岩心、测井及生产动态资料对海上分流河道型浅水三角洲砂体进行了储层构型研究,建立了研究区浅水三角洲砂体构型级次划分、界面识别标准及空间结构模式。研究区浅水三角洲砂体可划分为三角洲体、三角洲前缘沉积体、复合河道及单一分流河道等4级构型级次,其中单一分流河道纵向界面包括沉积成因的泥岩界面、碳酸盐胶结成因的钙质界面及冲刷切割成因的物性界面等3种类型,侧向界面识别包括漫溢沉积、湖相泥岩及废弃河道等3种定性识别方法和相似油田类比及厚度模型2种定量确定方法;空间上,受湖平面下降影响,研究区浅水三角洲复合河道砂体多呈进积序列,砂体平面形态由片状向条带状转变,储层连通性逐渐变差,从而导致剩余油多分布在复合河道砂体顶部。
The precision of taking the layers of the shallow water delta reservoirs as the research unit has been unable to meet the demand,especially for the situation of large well spacing in offshore oilfields.Taking the lower Minghuazhen Formation of Qikou(QK)oilfield of Bohai sea as an example,the reservoir configuration of shallow water delta sand bodies is studied by virtue of core,logging and production performance data,and the level classification,interface identification and spatial structural model of shallow water delta sand body configurations are established.The shallow water delta sand body configurations in the study area can be divided into four levels of delta body,delta front sediment body,composite channel and single distributary channel.Among them,the longitudinal interface of single distributary channel includes the mudstone interface of sedimentation origin,calcium interface of carbonate cementation origin and physical interface of erosion origin.The lateral interfaces can be identified with three types of qualitative identification methods,namely the overflow deposits,lacustrine mudstone and abandoned channel,and two types of quantitative methods,namely the analogy of similar oilfields and thickness model.Spatially,affected by the descending of lake level,the sand bodies of shallow water delta composite channel mostly show the progradational sequence.The planar shape of sand bodies changes from sheet-like to strip-like,and the connectivity of reservoirs becomes worse,which makes the remaining oil mainly distribute on the top of composite channel sand bodies.
作者
李振鹏
LI Zhenpeng(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2020年第1期103-110,共8页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范(编号:2016ZX05058-001)”部分研究成果
关键词
储层构型
浅水三角洲
明下段
歧口油田
渤海海域
reservoir configuration
shallow water delta
the lower member of Minghuazhen Formation
QK oilfield
Bohai sea
