磁共振成象测井提供的基本信息及其应用

肖立志．磁共振成象测井提供的基本信息及其应用．测井技术，１９９７，２１（２）：７９～８９当前的磁共振成象测井（ＭＲＩＬ）有Ｃ型和Ｃ／ＴＰ型两种型号。Ｃ型有３种不同的观测方式，即标准Ｔ２测井、ＴＲ测井和ＴＥ测井。Ｔ２测井直接提供的信息有：有效孔隙度ＭＰＨＩ、束缚水孔隙体积ＭＢＶＩ、自由流体孔隙体积ＭＢＶＭ、渗透率，结合电阻率测井确定的地层电阻率以及中子／密度交会总孔隙度，可以计算出油水饱和度。ＴＲ测井与ＴＥ测井根据油气水各相纵向弛豫时间、横向驰豫时间以及扩散系数的差异，对孔隙流体的类型及油气层界面进行定性识别，并且正在发展相应的定量计算油气饱和度的方法。Ｃ／ＴＰ型仪器在Ｃ型基础上进行了较大的改进，除了提供上述信息外，还能够测量泥质束缚水，进而得到地层总孔隙度。弄清这些信息的来源和含义，对正确运用ＭＲＩＬ资料解决油藏地质与开发工程问题将是必需和有益的。文中通过典型应用实例，介绍了这些信息的含义与用途。

Basic Information Provided by MRIL and Typical Field Examples.

The current MRIL tool includes two different types, i.e.MRIL C and MRIL C/TP.Using MRIL C, we can run standard T 2 log, TR log and TE log. From standard T 2 log, we can directly get lithology independent effective porosity MPHI ,bulk volume irreducible water MBVI , bulk volume movable fluid MBVM and permeability. Integrated with formation resistivity and neutron density total porosity, saturation of water and oil can be calculated. According to the difference of longitudinal relaxation time, transverse relaxation time and diffusibility among oil, gas and water respectively, TR and TE logs can be used to identify qualitatively the fluid types in pores and the boundary of oil/water bearing zone. And now, the corresponding quantitative computation method for oil and gas saturation is being developed. With MRIL C/TP, bulk volume of clay bound water and furthermore, formation total porosity can be determined in addition to the above information provided by MRIL C.It is indispensable and beneficial to make clear the source and the meaning of the above mentioned information for solving the problem in reservoir geology and reservoir engineering.