电成像孔隙度谱在砂砾岩有效储层识别的应用

砂砾岩体储层非均值性强、孔隙结构复杂，测井识别储层有效性难度大。以红车断裂带佳木河组砂砾岩地层为研究对象，综合运用物性、岩石薄片、压汞等资料，将研究区储层孔隙结构划分为三种类型。鉴于中基性母岩顺磁矿物的影响，核磁共振测井对孔隙结构及储层有效性反映不灵敏，因此，充分利用成像资料反映井壁砂砾岩体非均质性的优势，根据FMI电阻率值转化的孔隙度谱的形态特征，将研究区孔隙度谱归为多峰宽谱型、变峰中谱型和单峰窄谱型，并提取出孔隙度谱几何平均值（Pgm），方差（φv2），局部最大、最小孔隙度(φmax、φmin)，变异系数(VKφ)等参数，明确了各个参数与压汞孔隙结构参数存在确定的关系后，建立了基于孔隙度谱参数的渗透率计算公式及储层分类综合评价指数，并结合试油资料，建立了适合本研究区的砂砾岩储层评价标准。最终将该方法应用至井筒剖面中，有效划分了有利储层，也为研究区砂砾岩油藏的高效开发提供了依据。

Application of FMI porosity spectrum in identification of effective reservoir in sandy conglomeratic reservoirs

High heterogeneity and complex pore structure of conglomeratic sandstone makes it difficult to identify reservoir effectiveness by logging. Based on data of physical properties, rock thin sections and mercury intrusion experiment from Jiamuhe formation in Hongche Fault Belt, the pore structure in this area was divide into 3 types. Affected by paramagnetic minerals in intermediate-basic volcanics, NMR is insensitive to reflect pore structure and effective reservoir. Therefore, divide the porosity frequency spectrum into multi-peak wide spectrum, variable peak medium spectral and unimodal narrow spectrum, and extract parameters from porosity spectrum such as geometric mean, variance, local minimum porosity, local maximum porosity, variation coefficient, after defined the relationship between the various parameters and mercury intrusion parameters. the calculation formula of permeability and reservoir composite index is established. And combined with oil testing data, the reservoir evaluation standard is established. Ultimately, apply the method approach to the hole, which effectively divide the favorable reservoirs and provides evidence for development in conglomerate reservoir.