如何正确对待磁共振成象测井技术

How to Form a True Estimation of Magnetic Resonance Imaging Log.

高效曾．如何正确对待磁共振成象测井技术．测井技术，１９９７，２１（２）：１４８～１５０磁共振成象测井是评价地层的有效手段。但是，和其它测井方法一样，在评价地层时，核磁共振测井仍然离不开岩心分析资料，仍然需要地层参数的先验信息。例如，用ＭＲＩＬ测得的Ｔ２评价地层渗透率时，必须借助地层因素Ｆ，否则会造成较大的误差。此外，砂岩粒度、砂岩的亲水性以及仪器稳定磁场的强度等均会影响到ＭＲＩＬ仪测得的弛豫时间Ｔ１和Ｔ２。由于测井资料反演的多解性，必然要用多种测井资料综合解释以正确评价地层。这里，提出此种看法的目的在于和肖立志先生共同探讨磁共振成象测井的若干技术问题。

Magnetic Resonance Imaging Log (MRIL) is an effective means of formation evaluation. However, like the other logging methods, MRIL still requires both core analysis data and prior information of formation parameters for formation evaluation. For example, formtion factor F is necessary when formation permeability is calculated with relaxation time T 2 obtained from MRIL. Otherwise errors will occur. In addition, sandstone grain size, water wettability of sandstone and the strength of magnetic fields of MRIL tool often influence T 1 and T 2 measured by the tool. Integrated interpretation of various logging data must be used for correct formation evaluation due to the multi solution of logging data inversion. The opinion about MRIL mentioned herein is only a reference for Mr. Xiao Lizhi.