河南省济源市郭沟井田山西组沉积环境分析

Analysis of depositional environment for Guogou Mine Field in Jiyuan City,Henan Province

以济源市郭沟井田勘探资料为基础,对井田山西组地层特征和沉积环境进行分析。研究表明郭沟井田沉积环境为海退过程中的潮坪和三角洲沉积环境。潮坪相以混合坪+泥坪+泥炭沼泽+泥坪和泥坪+泥炭沼泽+泥坪沉积2种沉积序列为主,其泥炭沼泽环境中沉积了稳定的二1煤层;三角洲相包括了上三角洲平原和下三角洲平原,下三角洲平原以水下分流河道+水下分流间湾和水下分流河道+水下天然堤+水下分流间湾连个沉积序列为主,上三角洲平原以分流河道和分流间湾沉积序列为主。

On the basis of exploration data, coal seam character of Shanxi Formation and depositional environment of Guogou Mine Field were analyzed in detail. The results showed that depositional environment was tidal fiat and delta of regressive process for Guogou Mine Field. Sedimentary facies of tidal flat was mudflats ＋ peat swamp ＋ mudflats and mixed flat ＋ nmdflats ＋ peat swamp ＋ mudflats No.Ⅱ1 coal seam had been deposited in the peat swamp. The delta facies was dominated by upper delta plain and lower delta plain deposits. The lower delta plain was dominated by underwater distributary channel ＋ underwater interdistributary and underwater distributary channel ＋ underwater natural levee ＋ interdistributary. The upper delta plain was dominated by distributary channel ＋ interdistributary.