…(3) Coalfield gas: Produced in coalbeds or strata near coalbeds in coalfields. Of these, oilfield gas is the subject of industrial operations worldwide. Gas dissolved in crude oil produced from oil reservoirs and separated at the surface is called “associated gas” or “oil well gas”, while gas produced separately from crude oil is called “non-associated gas” or “gas well gas”. Of the latter, some are entirely in gas phase under underground conditions, but precipitate a liquid phase called “condensate” under physical conditions on the surface. … *Some of the terminology used to refer to "gas well gas" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(3)炭田ガス 炭田地帯で炭層または炭層付近の地層から産出する。 このうち,世界的に産業的稼行の対象となるのは油田系ガスであり,油層から生産される原油中に溶存していて,地表で分離されるガスを〈随伴ガス〉または〈油井ガス〉と呼び,原油とは別にガスだけ産出するものを〈非随伴ガス〉または〈ガス井ガス〉と呼ぶ。後者のうちで,地下の条件では全体がガス相であるが,地表の物理条件では〈コンデンセート〉と呼ぶ液相を析出するものもある。… ※「ガス井ガス」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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