翻訳と辞書 Words near each other ・ DIM (automobiles) ・ Dim All the Lights ・ Dim Batterson ・ Dim Dam ・ Dim Effect ・ Dim Gray Bar Press ・ Dim Lights, Thick Smoke (And Loud, Loud Music) ・ Dim Lit ・ Dim Mak (band) ・ Dim Mak (disambiguation) ・ Dim Mak Records ・ Dim Qeshlaq-e Olya ・ Dim River ・ Dim Seqerlu ・ Dim sim ・ Dim spot ・ Dim Stars ・ Dim sum ・ Dim sum bond ・ Dim Sum Dollies ・ Dim Sum Funeral ・ Dim the Lights, Chill the Ham ・ Dim Zelleh ・ Dim Zupan ・ Dim3 ・ Dima ・ Dima (album) ・ DIMA (database) ・ Dima (woreda) ・ Dima and Lama Hattab 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 Dim spot ： ウィキペディア英語版 Dim spot In reflection seismology, a dim spot is a local low amplitude seismic attribute anomaly that can indicate the presence of hydrocarbons〔(Schlumberger: Oilfield Glossary )〕 and is therefore known as a direct hydrocarbon indicator. It primarily results from the decrease in acoustic impedance contrast when a hydrocarbon (with a low acoustic impedance) replaces the brine-saturated zone (with a high acoustic impedance) that underlies a shale (with the lowest acoustic impedance of the three), decreasing the reflection coefficient. ==Occurrence== For a dim spot to occur, the shale has to have a lower acoustic impedance than both the water sand and the oil/gas sand, which is the opposite situation required for a bright spot to occur. This is possible because compaction causes the acoustic impedances of sands and shales to increase with age and depth but it does not happen uniformly – younger shales have a higher acoustic impedance than younger sands, but this reverses at depth, with older shales having a lower acoustic impedance than older sands.〔(Brown, Alistar. R., (2010), “Dim Spots in Seismic Images as Hydrocarbon Indicators”, AAPG Search and Discovery Article #40514. )〕 Similarly to bright spots, not all dim spots are caused by the presence of hydrocarbons and therefore they should not be treated as conclusive evidence hydrocarbon accumulations. 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「Dim spot」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.