翻訳と辞書 Words near each other ・ Formateur ・ Formate–tetrahydrofolate ligase ・ Formate—dihydrofolate ligase ・ FormatFactory ・ Formation ・ Formation (American football) ・ Formation (association football) ・ Formation (Catholic) ・ Formation (group theory) ・ Formation 8 ・ Formation and evolution of the Solar System ・ Formation Armed F ・ Formation dance ・ Formation evaluation ・ Formation evaluation gamma ray ・ Formation evaluation neutron porosity ・ Formation finish ・ Formation fluid ・ Formation flying ・ Formation matrix ・ Formation of rocks ・ Formation of the Eastern Bloc ・ Formation patch ・ Formation reconnaissance regiment ・ Formation rule ・ Formation skydiving ・ Formation Z ・ Formations of the Hellenic Army ・ Formations of the Soviet Army ・ Formations of the United States Army Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Formation evaluation neutron porosity ： ウィキペディア英語版 Formation evaluation neutron porosity In the field of formation evaluation, porosity is one of the key measurements to quantify oil and gas reserves. Neutron porosity measurement employs a neutron source to measure the hydrogen index in a reservoir, which is directly related to porosity. The Hydrogen Index (HI) of a material is defined as the ratio of the concentration of hydrogen atoms per cm3 in the material, to that of pure water at 75 °F. As hydrogen atoms are present in both water and oil filled reservoirs, measurement of the amount allows estimation of the amount of liquid-filled porosity. ==Physics== Neutrons are typically emitted by a radioactive source such as Americium Beryllium (Am-Be) or Plutonium Beryllium (Pu-Be), or generated by electronic neutron generators such as minitron. Fast neutrons are emitted by these sources with energy ranges from 4 MeV to 14 MeV, and inelastically interact with matter. Once slowed down to 2 MeV, they start to scatter elastically and slow down further until the neutrons reach a thermal energy level of about 0.025 eV. When thermal neutrons are then absorbed, gamma rays are emitted. A suitable detector, positioned at a certain distance from the source, can measure either epithermal neutron population, thermal neutron population, or the gamma rays emitted after the absorption. Mechanics of elastic collisions predict that the maximum energy transfer occurs during collisions of two particles of equal mass. Therefore, a hydrogen atom (H) will cause a neutron to slow down the most, as they are of roughly equal mass. As hydrogen is fundamentally associated to the amount of water and/or oil present in the pore space, measurement of neutron population within the investigated volume is directly linked to porosity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Formation evaluation neutron porosity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.