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当储层孔隙中同时存在油、气和水时,一维核磁共振测井难以准确判别孔隙中流体的性质。二维核磁共振能够测量横向弛豫时间、纵向弛豫时间、扩散系数、内部梯度场,充分利用了核磁共振的测量信息。介绍了二维核磁共振测井的基本方法,及二维核磁共振测井仪MR Scanner的工作原理和应用。二维核磁共振测井通过多种探测深度测量对比,得到了泥浆侵入剖面流体变化信息,提供更准确的储层流体性质信息。对长庆油田二维核磁测井应用实例进行了分析,测井解释结果与试油结论一致。
One-dimensional nuclear magnetic resonance logging is difficult to accurately determine the properties of fluids in the pores when both oil and gas and water are present in the pores of the reservoir. Two-dimensional nuclear magnetic resonance can measure transverse relaxation time, longitudinal relaxation time, diffusion coefficient, internal gradient field, take full advantage of the NMR measurement information. The basic method of two-dimensional nuclear magnetic resonance logging is introduced, and the working principle and application of two-dimensional nuclear magnetic resonance logging tool MR Scanner are introduced. Two-dimensional nuclear magnetic resonance logging through a variety of exploration depth measurement contrast, get the fluid intrusion profile change information, to provide more accurate reservoir fluid properties of information. The application of two-dimensional nuclear magnetic logging in Changqing Oilfield is analyzed. The logging interpretation results are in agreement with the test oil.