yóu céng
意思解释：（Oil reservoir）产石油的岩层，常为砂岩、石灰岩或页岩。
积聚着石油的地层。1891年傅兰雅辑《格致汇编》第五册《地学稽古论》:“其石分数种:有灰石、韧泥与泥片石。灰石皆分层片，色青或灰，韧泥多蓝色，泥片石色多黑。炼之出油层中又往往产煤，亦产铁成块。”…
Accumulative petrolic layer. Is Fu Lan elegant 1891 collect does case send collection the 5th is geoscience check ancient theory : of qualitative of eight Guan has mud of grey stone, pliable but strong and cover or daub with plaster piece stone. Grey stone is all statified piece, green or color is grey, much blue of mud of pliable but strong, mud piece stone color is much blacker. Coal often is produced of refine again in giving oil reservoir, also produce iron agglomerate. ...
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