公开(公告)号：EP0886792A1

公开(公告)日：1998-12-30

申请号：EP97908242

申请日：1997-03-13

申请人： SHELL INT RESEARCH

发明人： BONNIE RONALD JOHANNES MARIA ,  HOFSTRA PAUL ,  LOOYESTIJN WILHELMUS JOHANNES ,  SANDOR ROBERT KARL JOSEF

IPC分类号： G01R33/44 ,  G01V3/14 ,  G01V3/32

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01N24/082 ,  G01V3/14

摘要： A method of determining the fraction of a fluid selected from at least two fluids contained in an earth formation is provided. The method comprises inducing a magnetic field in a region of said earth formation, conducting a pulse-echo NMR measurement in said region of the earth formation, and selecting a relationship between the NMR echo response from said fluids, the fractions of the fluids, and a variable which affects the NMR echo response in a manner dependent on the fractions of said fluids. By varying said variable in the course of the NMR measurement the measured NMR echo response is affected in a manner dependent on the fractions of said fluids. The fraction of the selected fluid is then determined by fitting the NMR echo response to said selected relationship.