Description of carbonate reservoirs with NMR log analysis method
Description of carbonate reservoirs with NMR log analysis method
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发表时间：
2006
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通讯作者：
Tan Mao-jin;Zhao Wen-jie
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作者：
Tan Mao-jin;Zhao Wen-jie
常规测井技术难以正确评价砂砾岩储层、碳酸盐岩储层、火成岩储层等具有复杂孔隙空间、特殊岩性、非均质层的复杂储层，需要借助一些高科技测井技术。核磁共振测井作为新理论的基础，可以提供精确的孔隙度，且对岩性的依赖性较小，可用于储层识别。表征孔隙结构、核磁共振T2分布可以用来识别有效缝洞，并总结出一系列规律形成表格。此外，在储层无水的特殊条件下，可动流体量与总孔隙度的比值可作为含油饱和度。利用这些方法，描述了车古20潜山碳酸盐岩储层缝洞特征，并计算了城北地区碳酸盐岩储层的含油饱和度，对于准确储量具有重要意义。
Conventional log technology is difficult to evaluate correctly some complex reservoirs which are characterized with complicated pore space,special lithology and inhomogeneous layers such as conglomerate reservoir,carbonate reservoir,igneous reservoir and so on,it is necessary to resort to some high-technology logs.As a base of new theory,nuclear magnetic resonance(NMR) log can provide accurate porosity which is little dependent of lithology,so it can be used for reservoirs identifying.Characterizing porosity structure,T2 distribution of NMR can be used to identify valid fractures and vugs and a series of rules are summarized as a table.Furthermore,at special conditions without water in reservoirs,the ratio value of movable fluid volume and total porosity maybe regard as oil saturation.With these methods,characterization of fractures and vugs are described in Chegu 20 Buried-Hill carbonate reservoirs,and oil saturation of carbonate reservoirs of Chengbei zone is calculated,which is profound for accurate reserves.