发明授权
US5389877A Nuclear magnetic resonance pulse sequences for determining bound fluid
volume
失效
用于确定结合流体体积的核磁共振脉冲序列
- 专利标题： Nuclear magnetic resonance pulse sequences for determining bound fluid volume
- 专利标题（中）： 用于确定结合流体体积的核磁共振脉冲序列
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申请号： US800339申请日： 1991-11-27
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公开(公告)号： US5389877A公开(公告)日： 1995-02-14
- 发明人: Abdurrahman Sezginer , Christian Straley
- 申请人： Abdurrahman Sezginer , Christian Straley
- 申请人地址： NY New York
- 专利权人： Schlumberger Technology Corporation
- 当前专利权人： Schlumberger Technology Corporation
- 当前专利权人地址： NY New York
- 主分类号： G01R33/44
- IPC分类号： G01R33/44 ; G01V3/32 ; G01V3/00
摘要：
An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to:T.sub.r -90.degree..sub..+-.x -(t.sub.cp -180.degree..sub.y -t.sub.cp -echo.sub.j)where j is the index of CPMG echoes gathered, T.sub.r is wait time, t.sub.cp is the Carr-Purcell spacing. This pulse sequence is used to determine Bound Fluid Volume (BFV) which is subtracted from total porosity to yield Unbound Fluid Volume (UFV) of a formation surrounding the borehole. Measuring the BVF, the amount of rapidly relaxing fluid (less than 50 ms), is more efficient than measuring UFV (up to 2 secs), and is insensitive to motion of the logging tool.
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