白云岩储层电成像视地层水电阻率流体识别技术

电成像测井资料具有分辨率高、井眼覆盖率高、可探测冲洗带信息的特点,在一定程度上可反映近井壁流体分布。通过与常规测井资料计算的变胶结指数m和孔隙度相结合,求取储层的视地层水电阻率分布谱,并提取谱的均值与方差参数作交会图,建立储层流体性质识别图版,在中低孔隙度渗透率石灰岩地层的油层识别中发挥了重要作用。通过对比含不同流体储层及非储层视地层水电阻率谱的特征,拾取特征参数,并结合孔隙度信息,建立了研究区特低孔隙度渗透率白云岩储层流体性质识别图版,气层识别符合率达91.7%,排除了非储层视地层水电阻率谱与气层相近的干扰,在塔东地区碳酸盐岩储层中应用见到较好效果。

Fluid Identification Technique Based on Imaging Apparent Formation Water Resistivity in Dolomite Reservoirs

Micro-electric imaging logging with high resolution and borehole coverage, can detect information of flushed zone and, to a certain extent, reflect fluid distribution of formations near borehole.Associated with variable bond index m and effective porosity by conventional logging, an apparent formation water resistivity distribution spectrum is developed using imaging logging data, and the mean and variance are extracted to make a cross-plot, then a reservoir fluid property identification chart is established, which plays an important role in fluid identification of low porosity-permeability limestone reservoirs.In this paper, characteristics of the spectrum of different fluid-bearing reservoirs and non-reservoirs are compared, by their characteristic parameters and the relevant porosity, a fluid identification chart for extremely low porosity-permeability dolomite reservoirs of the area is developed, which gets a gas layer identification coincidence of 91.7%, excluded the interruption that the spectrum of formation water resistivity of non-reservoirs is similar to gas reservoirs, so showing a good application result in eastern Tarim carbonate reservoirs.