发明名称 |
PROCEDE ET DISPOSITIF POUR MESURER LA DENSITE DES FORMATIONS TRAVERSEES PAR UN FORAGE |
摘要 |
<p>A technique for determining the density of an earth formation with a logging sonde including a gamma ray source and two gamma ray detectors spaced at different distances from the source is disclosed. The count rate of the short-spaced detector is measured in two energy ranges covering back-scattered gamma rays which have undergone relatively low and high attenuations respectively. A first density correction is determined from the difference between the apparent density derived from the count rate of the long-spaced detector and the density derived from the count rate of the short-spaced detector in the energy range covering gamma rays with relatively low attenuation. A second density correction is determined from the difference between the densities derived from the two short-spaced detectors' count rates. These two density corrections are added to the apparent density to give the true formation density.</p> |
申请公布号 |
GR57856(B) |
申请公布日期 |
1977.07.05 |
申请号 |
GR19947501496 |
申请日期 |
1975.12.30 |
申请人 |
SOC DE PROSPECTION ELECTRIQUE SCHLUMBERGER |
发明人 |
ELLIS D |
分类号 |
G01V5/04;G01N23/203;G01V5/12 |
主分类号 |
G01V5/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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