关键词: 核磁共振, 低渗透油田, 可动流体, 开发潜力, 评价

Abstract: In this paper,the movable fluid evaluation and research were made in 165 cores using nuclear magnetic resonance technique.The cores are from four typical oilfields with low permeability in Xinjiang Xiaoguai,Qinghai Shizigou, Daqing Toutai and Changqing Ansai oilfields and have three different lithologies. The correlations among movable fluid,porosity and permeability were analyzed.Combined with the oilfield development data,author found that the movable fluid parameter is a key factor for the evaluation of development potential in low permeability oilfield.The conventional methods used for development potential evaluation in middle or high permeability oilfields can't be simply applied to low permeability oilfields.The movable fluid should be considered as a necessary factor.Factors affecting the movable fluid in low permeability oilfield were analyzed and studied in detail,and the results indicated that microstructures of pore such as microfracture,clay-filling and induced pore are the major factors that determine the movable fluid in low permeabil ity oilfield.

Key words: nuclear magnetic resonance, low permeability oilfield, movable fluid, development potential, evaluation