摘要
对研究区块砂砾岩储层的实际测井资料、水淹特征和机理进行了研究 ,结果表明 ,利用自然电位 (SP)、自然伽马 (GR)、声波、微电极、电阻率测井曲线对砂砾岩储层进行定性识别。定量识别指标为 :自然伽马相对值ΔGR<0 15 ,粒度中值Md>0 2 4mm ,声波时差DT <2 6 0 μs/m。在储层的水淹过程中 ,储层的孔隙度和渗透率增大 ,孔隙结构系数减小 ,润湿性由中性偏亲水向弱亲水、亲水、强亲水方向转化 ,Archie参数m和n随地层水电阻率的增大而减小。其中 ,注入水矿化度与原始地层水的差别和有效泥质含量 (阳离子附加导电性 )是控制储层水淹过程中电阻率变化的主要因素之一。水驱过程中岩石电阻率Rt 与含水饱和度Sw 的关系随注入水矿化度与原始地层水的差别表现出不同的关系。在注入淡水条件下 ,根据注入水矿化度的不同 ,Rt 与Sw 之间的关系可呈现出非对称的“U”、“L”、或“∽”曲线特征。
Based on the study of its actual well log data,logging attributes and water-flooding mechanism of the study area,the grit water-flooding reservoir can be identified qualitatively by using GR,SP,DT,ML and RT curves.The quantitative identification indexes include the following parameters:gamma ray relative value, ΔGR, is below,the middle value of particles is over 0 24, and the travel time DT is less than 260μs/m.In the process of water-flooding,reservoir porosity and permeability increase,and the coefficient of pore structure reduces,and wettability turns from hydrophobicity or neutrality to weak to strong hydrophicity,and the Archie parameters such as m and n reduce as the resistivity of formation water increases.The salinity ratio of injecting water to in-situ formation is one of the major factors influencing on reservoir resistivity during water-flooding stage.Due to the different salinity of injecting water,relations between formation resistivity and water saturation show nonsymmetrical shapes of 'U','L' or '∽'.The study results are very helpful for log interpretation of waterflooding formation and establishment of adjustment plan.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2002年第6期50-55,共6页
Acta Petrolei Sinica
基金
中国石油天然气总公司重点研究项目 (960 50 3)部分成果
关键词
砂砾岩
油田
水淹层
测井
特点
机理
研究
水淹机理
电阻率
grit reservoir
water-flooding formation
logging data
water-flooding mechanism
resistivity
quantitative identification
