砂砾岩储层测井评价研究

砂砾岩储层岩性复杂、非均质性强,储层间非渗透性隔层类型多,储层基质孔隙度有时很低,从而使测井资料准确划分有效储层有很大的难度;砂砾岩体储层母岩类型变化大,岩石骨架参数很难确定,电阻率测量受岩石骨架、粘土含量和孔隙结构影响严重,反映储层孔隙流体性质的信息弱,使储层流体性质难以判断,油、气、干层界限的电性特征极不明显.通过核磁共振和井壁微电阻扫描成像测井,可以直观观察到岩石成分和粒径的变化,通过T2谱分布直观显示核磁测量井段的孔径分布,计算出各种类型孔隙度和渗透率参数,为砂砾岩有效划分储层和测井评价提供了可靠的依据.

Sandy Conglomerate Reservoir Logging Evaluation Study

Because of the lithology complexity,high heterogeneity,much impermeable barrier types,sometimes low matrix porosity of sandy conglomerate reservoir,it is difficulty to divide valid reservoir using log data.Much source rock types leads to trouble in measuring matrix parameter.The resistivity measuring is severely affected by matrix lithology,clay content and pore structure.The electric characteristics of oil,gas-bearing and tight zone is not very evident,so,it is difficult to identify the property of reservoir fluid.The change of ingredient and grain size,clay content and pore framework can be observed directly through nuclear magnetism resonance logging and sidewall micro-resistivity scan image logging.All kinds of porosity and permeability can be obtained through distribution of pore diameter using T2 spectrum distribution.It provides proof to evaluate and divide valid reservoir effectively.