Analysis Of Depositional System And Sequence Stratigraphy Of Coal Measures In Pingzhuang Basin

Based on the analyzing of much of geological data of Pingzhuang basin and coal-bearing basins both here and abroad, combined field geologic survey, applied theoretics and methods of sedimentology, sequence stratigraphy, structure geology and coal geology, drawed basic charts such as deposit section maps, isopach maps of coal seam and contour maps of glutinite , Pingzhuang basin had been studied and understood more intensively. The evolution alprocess and stages of Pingzhuang basin were confirmed; the sedimentary facies were identified as alluvial fan facies , fluvial facies, fan-delta facies , delta facies and lacustrine facies , and classified as alluvial depositional system, lake-delta and fan-delta depositional system; the deposit characteristics and spatial distribution law of depositional systems were disclosed; based on surface of palaeotectonics movement and big scale erosion surface, Xingyuan formation and Yuanbaoshan formation —coal measures of Pingzhuang basin, were divided into one supersequence and two sequences , and the sequence of strata characteristics were expounded; the basin -fill sequences , genetic stratigraphic frame work and depositional stratigraphic frame work were set up ; in view of tectonic evolution of basin, the history of basin evolution were resumed; the sedimentary environment of coal measures was remolded ; coal -forming law and characteristics were summed up ; and the favorable coal prospect area was pointed out .