华亭矿区延安组沉积环境分析

Yanan Formation Depositional Environment Analysis in Huating Mining Area

华亭矿区延安组形成于河流、湖泊三角洲—湖泊沉积体系,其中以湖泊三角洲平原占优势,其沉积相有河流相、冲积扇相、湖泊三角洲相、湖泊相。煤系沉积初期,以河流及冲积扇沉积为主,沉积中期则以湖泊三角洲沉积为主,晚期以湖泊环境为主,延安组各煤层大多是在湖泊三角洲平原上泥沼化形成的。

The Yanan Formation in Huating mining area was formed in fluvial, lake delta-lacustrine depositional system, and the lake delta plain is in the ascendant, and have sedimentary facies of fluvial, alluvial fan, lake delta and lacustrine. During the initial stage of coal measures deposition, was mainly alluvial fan deposit, middle stage lake delta deposit and later stage lacustrine deposit. Most coal seams in Yanan Formation were formed in peaty moors on lake delta plain.