【摘要】 核磁共振(NMR)测井是目前唯一能区分地层中可动流体和束缚流体的测井方法,具有其他测井方法不具备的独特优势。在分析孔隙介质中束缚水存在机理的基础上,给出了目前利用核磁共振测井确定束缚水的模型和方法,分析了各种方法的适用条件。研究结果表明:T2截止值方法(CBVI)是目前广泛使用的确定束缚水体积方法,这种方法在很多情况下是适用的,但不适合于高含水饱和度的粗粒砂岩以及碳酸盐岩储层;T2谱系数法(SBVI)不适合近似束缚水状态的含烃地层;渐变截止值法(TB-VI)适合于任何饱和水的以及水基泥浆冲刷的地层,在纯净、分选好的砂岩和碳酸盐岩地层,该方法计算结果更准确;BVI加权函数法对孔隙几何形状不敏感。更多还原

【Abstract】 Nuclear Magnetic Resonance Logging is the unique method to partition the irreducible and moveable fluids.In this paper,bulk volume of irreducible water models and their limitations were given based on the analysis of irreducible water.The results show that,T2cutoff method is appropriate in many cases,which is in wide use currently,but it is inappropriate in core-grained sandstones and carbonates at high water saturation;Spectral Bulk Volume Irreducible(SBVI) is inappropriate in hydrocarbon-bearing formations at or near irreducible conditions.The tapered cutoff(TBVI) can be used in any water-saturated formation,including zones that are flushed by water base mud filtrate.In clean well-sorted sands and carbonates,TBVI will give a more accurate value of bulk volume of irreducible water.BVI weighting functions are not very pore geometry sensitively.更多还原