低孔渗储层井周油藏侵入模拟及阵列感应电阻率校正方法

发布时间：2018-05-14 08:08

本文选题：低渗透储层 + 泥浆侵入　；参考：《吉林大学学报(地球科学版)》2017年01期

【摘要】：泥浆滤液侵入渗透性地层会改变井周地层流体的原始分布状态,使井周地层电阻率发生变化、储集层电测井响应失真。本文基于油水两相渗流理论和水对流扩散理论,应用数值模拟方法构建地层模型,研究低渗储层泥浆侵入过程中井周地层矿化度、含水饱和度、电阻率变化特征及井周油藏分布特征。对不同渗透率地层泥浆侵入的数值模拟结果表明:在低渗透储层,相同侵入时间内,随着地层渗透率的增加,泥浆侵入深度增加,且同一侵入深度的含油饱和度减小;随着侵入时间的增加,井周地层水矿化度、含水饱和度和地层电阻率的侵入剖面前缘均发生明显的变化。结合3口井的泥浆侵入数值模拟分析,发现阵列感应测井响应特征及其电阻率的幅度差异受泥浆侵入时间和侵入深度影响。不同流体性质层段的井周油藏动态演化规律模拟结果表明,井周油藏的变化情况与储层流体性质有明显关系。利用实例井侵入模拟结果与阵列感应测井响应的相关性,构建了侵入深度的计算公式;根据侵入阶跃剖面,利用几何因子理论构建了原始地层电阻率计算公式,用以辅助储层电阻率校正。正确认识井周地层泥浆侵入特征及井周油藏的分布情况有助于提高阵列感应测井评价储层的准确性。
[Abstract]:The mud filtrate invasion into permeable formation will change the original distribution state of the formation fluid around the well, change the resistivity of the formation around the well, and distort the electric logging response of the reservoir. Based on oil-water two-phase percolation theory and water convection-diffusion theory, the formation model is constructed by using numerical simulation method, and the salinity and saturation of formation around wells during mud invasion in low permeability reservoirs are studied. Characteristics of resistivity variation and reservoir distribution around well. The numerical simulation results of mud intrusion in different permeability formations show that the mud invasion depth increases with the increase of formation permeability and the oil saturation decreases with the increase of formation permeability in the low permeability reservoir with the same invasion time. With the increase of invasion time, the salinity of formation water, saturation of water content and the front edge of formation resistivity are all changed obviously. Combined with the numerical simulation analysis of mud invasion in three wells, it is found that the response characteristics and the amplitude difference of resistivity of array induction logging are affected by mud invasion time and depth. The simulation results show that the variation of the reservoir around the well is obviously related to the fluid property of the reservoir. Based on the correlation between the simulation results of intrusion and the response of array induction logging, the formula for calculating the depth of invasion is established, and the formula for calculating the resistivity of the original formation is constructed by using the geometric factor theory according to the intrusive step profile. Used to assist reservoir resistivity correction. The correct understanding of the mud intrusion characteristics and the distribution of the reservoir around the well is helpful to improve the accuracy of the array induction logging in evaluating the reservoir.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石油渤海钻探工程有限公司测井分公司;
【基金】：国家自然科学基金项目(41574122,41374124)~~
【分类号】：TE319;P631.81

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