…The technology of physical logging dates back to 1927, when the Schlumberger brothers, Conrad and Marcel Schlumberger, in France, used a pair of electrodes to measure the vertical distribution of resistivity and natural potential in a borehole. These were later called electrical logging and SP logging, but in principle they correspond to the resistivity method and natural potential method, which are types of geophysical exploration. The resistivity and natural potential curves obtained directly or indirectly indicate the geological and physical properties near the borehole, such as porosity and water saturation. … *Some of the terminology that refers to "SP logging" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…物理検層の技術は1927年にさかのぼり,フランスのシュランベルジェ兄弟Conrad Schlumberger,Marcel Schlumbergerはひと組の電極対で坑井中の地層比抵抗,自然電位の垂直分布を測定した。その後これらは電気検層,SP検層と呼ばれるようになったが,原理的にはそれぞれ物理探査の一つである比抵抗法,自然電位法に相当する。得られる比抵抗曲線と自然電位曲線は,坑井近傍の地質および物理的性質,例えば孔隙(こうげき)率,水飽和率などを直接あるいは間接的に示している。… ※「SP 検層」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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