摘要
川东北地区须家河组须三段陆相碎屑岩沉积储集岩石成分和结构复杂、物性条件差、非均质性强,常规测井参数解释模型技术在应用中受到限制。针对川东北地区须家河组储层的特点和难点,建立一套以元素俘获谱测井(ECS)为基础测井评价方法。元素俘获谱测井利用快中子与地层中的原子核发生非弹性散射碰撞及热中子被俘获原理,通过解谱和氧化物闭合模型得到地层中主要造岩元素的相对百分含量,并应用聚类分析、因子分析等方法定量求解地层的各种氧化物含量。在此基础上,建立储层岩石骨架属性、计算孔隙度、饱和度等储层综合评价。该方法在川东北地区须家河组致密砂岩储层评价中具有指导意义。
Continental clastic reservoirs of Xu 3 Member of Xujiahe Formation in northeastern Sichuan Basin have complex rock composition and structure, poor physical properties and strong heterogeneity, and can't be well interpreted by a conventional logging parameter model. Based on this study, a log evaluation method has been established based on element captured spectra(ECS) log data. Following the principle of that elastic scattering collision takes place between fast neutrons and formation nuclei and then thermal neutron are captured, the ECS logging method can get the relative percent of primary elements in formation by spectral decomposition and an oxide closure model; then the contents of various oxides in formation can be quantitatively calculated by cluster analysis and factor analysis; and finally, reservoir evaluation can be carried out, involving porosity and saturation, properties of rock skeleton etc. Field application has proved that this method has guiding significance in the evaluation of tight sandstone reservoirs of Xujiahe Formation in northeastern Sichuan.
引文
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(1)非法定计量单位,1 mD=0.987×10-3 μm2,下同