中东碳酸盐岩核磁共振实验研究

NMR Study on the Characteristics of the Cores from Middle East Carbonate Reservoirs

为更好地指导中国中东项目的顺利进行,利用核磁共振岩心分析技术对中东HF碳酸盐岩油田可动流体百分数和可动流体孔隙度进行了全面分析。对比了中东和国内大型油田的可动流体孔隙度特征。研究表明:不同渗透率碳酸盐岩T2截止值不尽相同,并且与部分石油公司推荐的90 ms有较大的差别。可动流体百分数和可动流体孔隙度与孔渗具有较好的正相关关系,其中可动流体孔隙度比可动流体百分数更能体现中东碳酸盐岩含量特征。通过对比,国内油田稍逊色于中东碳酸盐岩油田。通过CT以及恒速压汞岩心实验详细分析了可动流动含量特征的根本影响因素。

For the Chinese-Middle East projects being better carried out,the movable fluid of the samples of HF carbonate oil field in Middle East were tested and analyzed with the nuclear magnetic resonance technique.The characteristics of the large oil fields in China and Middle East were contrasted.Experiments show that the T2 cut off is not all the same for carbonate cores with different permeability,moreover,not equal to the value（90 ms） recommended by some major companies.The percentage and porosity of the movable fluid and the movable fluid porosity have a obvious positive correlation with the permeability and porosity.However,the characteristics of movable fluid in Middle East carbonate reservoirs could be better revealed by the movable fluid porosity.The domestic oil fields are fade to the oil fields in Middle East by contrast.And the essential influencing factors were analyzed in detail by using the CT and constant-rate mercury injection technology.