水淹层测井评价之产水率方法研究

STUDY ON WATER PRODUCTIVITY OF LOG EVALUATION OF WATER FLOODED RESERVOIRS

油田综合含水越来越高,利用常规测井解释方法进行水淹层评价越来越难。针对这一问题提出确定泥浆滤液电阻率、残余油饱和度和油、水相对渗透率来计算水淹层产水率的方法。把渗流理论引入到测井评价中来;对自然电位曲线影响因素进行分析和校正,利用校正后的泥浆电阻率来求泥浆滤液电阻率;对储集层的电阻率影响因素进行校正,建立精度较高的含水饱和度与束缚水饱和度综合解释模型。建立新的油、水相对渗透率图版,并可利用测井资料求出方程中的有关参数(例如残余油饱和度)。

It becomes more and more difficult to accurately evaluate watered - out formation with conventional logging data due to high water - cut and salinity variations of formation water. Methods as following can be used to calculate water productivity by determining mud filtrate resistivity, residual oil saturation and relative water permeability: 1. The seepage theory is introduced to solve the log evaluation problems;2. Correct SP curve for its environmental of effects. Then mud filtrate resistivity is computed from the corrected mud resistivity and C.3. Correct resistivity for its environmental effects and set up a high precision water saturation and irreducible water saturation interpretation model.4. Set up new equations for oil and water relative permeability. and calculate the related parameter in the equation from logging data(example for residual oil saturation) , thus preparing the ground for accurately solving water productivity.