核磁共振流体识别方法研究

Study on NMR Fluid Identification Method

核磁共振(NMR)测井的测量结果基本不受岩性的影响,在解释束缚流体和可动流体孔隙度、渗透率、饱和度等储层参数及研究储层孔隙结构特征即孔径分布规律时,具有其它测井方法无法比拟的优势。由于核磁共振测井测量的主要是地层孔隙介质中氢核对仪器的贡献,所以也可用来判别储层的流体类型及含烃饱和度。本文评价储层流体性质(油、气、水层和干层)的一般规律和确定原油粘度与弛豫特性关系,这是流体的定性分析;而在定量分析方面,总结了两种确定含烃饱和度的方法。本文也介绍了二维核磁共振技术识别流体方法的优势,为识别流体的类型提供了新方法。通过上述分析,阐明了用核磁共振测井判别储层流体性质的可行性,同时也说明了其局限性及适用条件。

Lithology does not basically affect the measurement of Nuclear Magnetic Resonance(NMR) Logging.It has more advantages over other logging methods in interpreting such reservoir parameters as porosity of bound and movable fluid,permeability and saturation and analyzing the pore structure.Because its'measurement is mainly from the H nuclear contribution of formation pore media to the logging instrument,it can be used to determine the fluid's types.This paper evaluate general law of reservoir fluid properties(oil,gas and water layers and dry layers) and determine the relationship between oil viscosity and the relaxation properties.This is a qualitative analysis of fluid.While,in quantitative terms,Summarized up two methods of determining the hydrocarbon saturation.This paper also presents the superiority of two-dimensional NMR techniques to identify fluid,which offer powerful tools for identifying fluid type in NMR logging.And then combining the result analysis of practical well logging information,the feasibility,limitation and practicable condition of recognizing the fluid is also explained in the paper.