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准噶尔盆地西北缘广泛发育扇三角洲沉积的砂砾岩储集体,针对玛北地区三叠系百口泉组砂砾岩储层非均质性强、低孔低渗特征,重点以核磁测井和成像测井为依据,结合常规测井、岩心观察、岩石薄片、扫描电镜及储层物性和试油资料分析,应用量化地质研究方法对砂砾岩储层进行分类评价。首先,结合试油资料和物性分析,识别砂砾岩有效储层物性下限,确立砂砾岩储层品质指数(RQI)评价标准;其次基于成像测井,根据核磁孔隙度、可动流体体积百分数、电阻率测井(RT)值及波阻抗建立核磁品质因子的定量评价标准;最后根据岩相和沉积相的关系,建立不同沉积微相发育的砂砾岩综合评价模板。该评价方法对砂砾岩储层的量化识别以及资源潜力评价均具有重要的意义。
Sandstone and conglomerate reservoirs are widely developed in the fan delta in the northwestern margin of the Junggar Basin. According to the characteristics of strong heterogeneity and low porosity and low permeability of the gravelly reservoirs in the Triassic Baikouquan Formation in the Mabei area, the emphases are on the basis of NMR logging and imaging Well basis, combined with conventional logging, core observation, thin rock slices, scanning electron microscopy and reservoir physical properties and test oil data analysis, the quantitative geological study method is used to classify and evaluate glutenite reservoirs. First of all, based on the test data and physical property analysis, identify the lower limit of effective reservoir physical properties of glutenite, and establish the RQI evaluation criteria. Secondly, based on imaging logging, according to the nuclear magnetic porosimetry, the volume fraction of movable fluid, Rate logging (RT) value and wave impedance to establish a quantitative evaluation standard of NMR quality factor. Finally, based on the relationship between lithofacies and sedimentary facies, a comprehensive evaluation template of glutenite with different sedimentary microfacies was established. The evaluation method is of great significance for quantitative identification of gravelly reservoirs and evaluation of resource potential.