摘要
瓦窑堡油田水晶沟区长2油层在开发过程中存在地层亏空大、产量递减过快,含水率高等问题,为深入研究长2油层砂体叠置特征及其对注水开发的影响,通过综合利用测井资料、岩心和生产动态等资料,得出结论:①研究区河道砂体厚度6.0~22.0 m,平均砂厚12.0 m,河道砂体宽度100~800 m,平均宽度315 m,河道砂体的宽厚比18~36,平均宽厚比25;②砂体垂向叠置类型共分为箱形+箱形河道砂、钟形+钟形河道砂、钟形+箱形河道砂、钟形河道砂+河口坝四种类型,不同类型砂体叠置类型的储层发育位置和砂体的连通性有所差异;砂体侧向接触关系主要以对接式和侧切式为主,孤立式较少;③研究区夹层发育,阻隔上下砂体之间的连通,砂体垂向叠置类型影响产量,其中箱形+箱形分流河道砂体储层最发育,产量最高,其次为钟形+箱形分流河道砂体,钟形分流河道砂体+河口坝砂体的厚度小,产量最低。该地区注水开发6个月后见效明显,产油量和产液量上升,针对井间连通性好、注水见效不明显和井间连通性不好的井,需进行储层改造来满足生产的需要。
There are many problems in the development process of Chang 2 reservoir in Shuijinggou area of Wayaobu Oilfield,such as depleted formation,rapid production decline and high water cut.In order to deeply study the superimposed characteristics and its impact on water injection development,logging data,core and production performance data are used,and the conclusions are as follows.①The thickness of channel sand body in the study area is 6.0~22.0 m,the average sand thickness is 12.0 m,the width of channel sand body is 100~800 m,the average width is 315 m,the width-thickness ratio of channel sand body is 18~36,and the average width-thickness ratio is 25.②The vertical superimposition types of sand bodies can be divided into four types:box+box channel sand,bell+bell channel sand,bell+box channel sand,bell channel sand+river mouth bar.The reservoir development location and connectivity of different types of sand body superimposed types are different.The lateral contact relationship of sand body is mainly butt type and side cut type,and the isolated type is less.③The interlayer in the study area is developed to block the connection between the upper and lower sand bodies.The vertical superposition type of sand bodies affects the production.Among them,the box+box distributary channel sand body is the most developed and the production is the highest,followed by the bell+box distributary channel sand body.The bell type distributary channel sand bodies+estuary bar sand bodies have small thickness and the lowest production.After 6 months of water injection development,the effect is obvious,and the oil and liquid production increases.For wells with good inter-well connectivity,poor water injection effect and poor inter-well connectivity,reservoir reconstruction is required to meet the production needs.
作者
田正兰
王凤琴
TIAN Zhenglan;WANG Fengqin(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;Key Laboratory of Tight Oil&Gas Geology in National Petroleum and Chemical Industry,Xi’an,Shaanxi 710065,China)
出处
《石油地质与工程》
CAS
2023年第3期76-81,共6页
Petroleum Geology and Engineering
基金
国家科技重大专项项目(2017ZX05039001-004)。
关键词
瓦窑堡油田
长2油层
单砂体
砂体叠置
注水开发
Wayaobu Oilfield
Chang 2 reservoir
single sand body
superimposed sand body
water injection development
作者简介
田正兰(1996—),女,在读硕士研究生,现从事非常规油气地质研究。E-mail:tianzhenglan1206@163.com。
