coal forming period meaning in English

聚煤期

With the tectonic uplift of the source area and the climate turning dry , the coal forming period was over , the fluvial system and fluvial - delta system became to play a major role . based on the study of former researchers and the theory of deep basin gas reservoir forming , the deep basin gas trap in the ordos basin is analyzed and is supposed to form in the ramp of the basin . it is supposed that the hydrocarbon of the deep basin gas trap is mainly composed of coal , carbonate and carbonaceous shale and with the " upper water seal " in the north of the study area the g
根据深盆气成藏理论和前人的研究成果，分析了深盆气藏的分布类型，认为鄂尔多斯盆地深盆气藏属于盆地斜坡成藏类型；认为深盆气的源岩以煤、炭质泥岩、暗色泥岩和碳酸盐岩为主；北部气水倒置、东部露头区有天然气逸出；气藏具有多重压力系统；成藏机理主要是气体动态的运移与聚集，稳定的构造背景有利于气藏的大面积保存。