发明授权
- 专利标题： Pulsed neutron porosity logging system
- 专利标题（中）： 脉冲中子孔隙度测井系统
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申请号： US789059申请日： 1977-04-20
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公开(公告)号： US4122340A公开(公告)日： 1978-10-24
- 发明人: Harry D. Smith, Jr. , Michael P. Smith , Ward E. Schultz
- 申请人： Harry D. Smith, Jr. , Michael P. Smith , Ward E. Schultz
- 申请人地址： NY New York
- 专利权人： Texaco Inc.
- 当前专利权人： Texaco Inc.
- 当前专利权人地址： NY New York
- 主分类号： G01V5/10
- IPC分类号： G01V5/10 ; G01V5/00
摘要：
An improved pulsed neutron porosity logging system is provided in the present invention. A logging tool provided with a 14 MEV pulsed neutron source, an epithermal neutron detector, and a fast neutron detector is moved through a borehole. Repetitive bursts of neutrons irradiate the earth formations and, during the bursts, the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation due to lingering thermal neutrons. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.
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