Sedimentology characteristics and coal-forming models debating in the coal-containing strata of Zhuozishan coal field

Analysis of sedimentary environment and coal accumulating regularity of Zhuozishan Coalfield was conducted based on analysis of borehole cores,tectonic-sedimentary and well sections.It indicates that the sedimentary environments consist of tidal flat,delta,meandering river.Supratidal zone,delta plain,flood plain and other eight subfacies and lots of microfacies canbe identified.The sedimentary of this area turned form marine facies to fluvial facies in the coal forming period,which can be divided into four stages.The intensity of coal forming was controled by the sedimentary facies distribution in this area in different period.The most advantaged coal forming sedimentary environment were supratidal swamps in the underpart of Taiyuan Formation and flood plain swamps in the underpart of Shanxi Formation.Two types of coal-forming models were founded,including tidal flat model and flood-delta plain model.