摘要
王盘山L27区块处于开发后期,存在产量递减较快、注水开发效果差、水淹井增多等问题,这些问题导致了后续油田稳定开发难度增大。通过综合测井、岩性、生产数据等资料,识别储层内隔夹层发育,精细小层划分,分析单砂体平面及垂向接触关系以及对油藏水驱开发效果的影响。结果表明:研究区单砂体接触方式垂向上分为分离式、叠加式、切叠式3类;平面上分为孤立式、对接式、侧切式3类。垂向上占比最高的是分离式接触关系,主力小层长4+5_(2)^(2)和长6_(1)^(1)层占比最高的平面接触方式是侧切式;单砂体垂向接触方式影响水井中有效注水砂体厚度,进而影响水驱动用程度,其中,切叠式水驱动用程度最高,叠加式次之,分离式最差;平面接触关系影响井间连通程度,孤立式、对接式、侧切式接触方式连通程度依次越高,注水开发的见效效果越好。
The L27 block in Wangpanshan is in the late stage of development,facing issues such as rapid production decline,poor water injection development effects,and an increase in flooded wells,which have made it more challenging to maintain stable oilfield development.This paper integrates well logging,lithology,production data,and other information to identify the development of interbeds within the reservoir,conducts detailed sublayer division,and analyzes the horizontal and vertical contact relationships of single sand bodies and their impact on the water drive development effect of the reservoir.The results show that the contact modes of single sand bodies in the study area are vertically classified into three types:separated,superimposed,and cut-stacked.they are classified the lateral contact modes of single sand bodies into isolated,docking,and side-cut types.The separated contact relationship accounts for the highest proportion vertically,while the side-cut contact mode is the most prevalent horizontally in the main sublayers Chang 4+5_(2)^(2) and Chang 6_(1).The vertical contact mode of single sand bodies affects the effective water injection sand body thickness in water wells,which in turn influences the degree of water drive utilization.Among them,the cut-and-superimposed mode exhibits the highest degree of water drive utilization,followed by the superimposed mode,and the separated mode performs the worst.The horizontal contact relationship affects the degree of inter-well connectivity,with the connectivity increasing in the order of isolated,butt-jointed,and side-cut contact modes,leading to better effects of water injection development.Studying the contact relationships of single sand bodies is conducive to the stable and efficient development of oilfields and provides guidance for subsequent single sand body division and water drive development in the L27 block.
作者
李龙语
谭成仟
成友友
罗翔
LI Longyu;TAN Chengqian;CHENG Youyou;LUO Xiang(Xi′an Shiyou University,Xi′an 710065,China)
出处
《河北地质大学学报》
2025年第1期36-44,共9页
Journal of Hebei Geo University
关键词
单砂体
接触关系
水驱动用程度
低渗油藏
single sand bodies
contact relationships
producing degree of water flooding
low permeability reservoir
