低渗砂岩水淹层水敏效应对电阻率的影响机理——以新立油田为例  

Mechanism of water sensitivity effect on resistivity in low permeability sandstone flooded layer: taking Xinli oilfield as an example

作　　者：熊诺林 欧阳传湘[1] 曾庆伟 XIONG Nuolin;OUYANG Chuanxiang;ZENG Qingwei(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Erlian Branch,PetroChina Huabei Oilfield Company,Xilingol,Inner Mongolia 026000,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]中国石油华北油田公司二连分公司,内蒙古锡林郭勒026000

出　　处：《中国科技论文》2023年第1期26-32,共7页China Sciencepaper

基　　金：中国石油科技创新基金资助项目(2017D-5007-0311)。

摘　　要：为了探究水敏效应对低渗砂岩储层电阻率的影响机理,以新立油田为例,通过CT扫描图像建立三维立体重构,并与岩心渗透率比值随矿化度变化曲线相结合,利用黏土矿物成分、储层孔喉类型、孔隙半径分布等,从微观层面探究水敏效应对岩石电阻率的影响规律。结果表明:新立油田岩石电阻率变化规律实验中,高矿化度注入水条件下曲线呈“L”型;低矿化度注入水条件下呈“U”型,水敏效应造成了低矿化度注入水条件下其变化曲线呈上升趋势,在加入水敏保护剂后曲线下降趋势相较于之前有所改善,但无法完全恢复至初始状态。且通过孔隙半径分布图像变化可知,水敏效应对岩心孔隙半径分布影响较大,新立油田在以后的注水开发工作中可通过加入水敏保护剂或控制注入水矿化度低于临界矿化度来降低水敏效应对岩石电阻率的影响。In order to explore the mechanism of water sensitivity effect on the resistivity of low permeability sandstone reservoir, taking Xinli oilfield as an example, combining the three-dimensional reconstruction of CT scan map with the curve of core permeability ratio changing with salinity, the influence of water sensitivity effect on rock resistivity was explored from the micro level by using clay mineral content, reservoir pore throat type and pore radius distribution. The results show that the curve of core resistivity in Xinli oilfield is “L” type under the condition of high salinity injection water. Under the condition of low salinity water injection, the curve shows a “U” shape, and the water sensitivity effect causes an upward trend of its change curve under the condition of low salinity water injection. After adding water-sensitive protective agent, the decline trend of the curve is improved compared with that before, but it can not completely recover to the initial state. It can be seen from the change of pore radius distribution image that the water sensitivity effect has a great influence on the pore radius distribution of core. In the future water injection development work of Xinli oilfield, the influence of water sensitivity effect on rock resistivity can be reduced by adding water sensitivity protector or controlling the injected water salinity lower than the critical salinity.

关 键 词：低渗储层 水淹层 岩石电阻率 矿化度 水敏效应 三维重构 

分 类 号：TE348[石油与天然气工程—油气田开发工程]