摘要
选取四川盆地须家河组54块砂岩岩样进行了核磁共振实验测量。通过T2谱面积比值法、称重法、SBVI法、统一T2截止值法和综合物性参数统计模型法确定了束缚水饱和度,对比分析了这五种方法,认为称重法和T2谱面积比值法可以作为建立束缚水饱和度模型的基础数据;统一T2截止值法和综合物性参数统计模型法效果优于SBVI法,可以用这两种方法来确定须家河储层的束缚水饱和度模型。根据压汞毛管压力测量结果,考察了核磁实验所得到的束缚水饱和度的应用条件。研究认为,对于渗透率大于1×10-4μm2的样品,0.6897 MPa的驱替压力可以将全部可动水驱替干净,核磁实验测得的束缚水饱和度即为严格意义上的束缚水饱和度。对于渗透率小于1×10-4μm2的岩样,0.6897 MPa的驱替压力不能将可动水全部驱出,核磁实验测得的束缚水饱和度只是一定驱替条件下的含水饱和度。
54 sandstone rock samples are selected from Xujiahe Formation in Sichuan Basin for experimen- tal nuclear magnetic resonance （NMR） measurements. Irreducible water saturation is determined through methods of T2 spectrum area ratio, weighing, SBVI, unified T2cutoff and comprehensive statistical parame- ter model. Contrast analysis of the five methods reveals that bound water saturation can be established on the basis of weighing method and T2 spectrum area ratio method, and that two methods of unified T2 cutoff value and comprehensive parameter statistical model are better than SBVI method, and can be used to determine Irreducible water saturation model of Xuiiahe Formation in Sichuan Basin. According to mercu- ry intrusion capillary pressure measurements, all the application conditions of irreducible water saturation derived from NMR experiments are studied. The studies suggest that as to rock samples the permeability of which is greater than 1×10-4μm2, displacing force of 0. 6897 MPa can drive all movable water, and that irreducible water saturation derived from NMR experiments is the proper one. While for rock sam- pies with permeability less than 1×10-4μm2, diplacing force of 0. 6897 MPa can＇t drive all movable water, and irreducible water saturation derived from NMR experiments can only be the one under certain driving conditions.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2010年第4期514-518,共5页
Nuclear Electronics & Detection Technology
基金
西南油气田分公司项目:包-界地区须家河组低孔低渗气
水层识别方法研究(编号:XNS14JS2005-307)部分研究成果
关键词
束缚水饱和度
核磁共振
实验
T2分布
T2截止值
压汞
Irreducible water saturation, NMR, experiment, T2 distribution, T2cutoff,mercury intrusion
作者简介
作者简介：张冲（1983-），中国石油大学（北京）博士研究生，主要从事测井资料综合解释与数据处理研究。
