Middle Pleistocene Sedimentary Environment Analysis In Shijiazhuang

This paper set about representative drilling research, according to the lithologicalvariation characteristics,and combined with some previous research on formation,Shijiazhuang formation of lithostratigraphy and chronostratigraphy division; At thesame time,application of particle size analysis of representative drilling sedimentcharacteristics and its change trend, sporopollen, magnetic susceptibility and thecharacteristics of logging curves is analyzed in the present study region in thePleistocene sedimentary conditions change; In the horizontal contrast based on theregional characteristics of depositional environment, reference, on the city ofShijiazhuang since the Middle Pleistocene sedimentary environment variationcharacteristics analysis. Such main conclusions can be drawn from the study:1. Strum of the Middle Pleistocene period in Shijiazhuang city can be divided intoYangliuqing Formation (Qp2y) of the middle Pleistocene Series OuzhuangFormation(Qp3o) of the upper Pleistocene Series, and Holocene series (Qh), on thebasis of bores lithology feature analysis and historical studies.2. Average grain size, the standard deviation, skewness and kurtosis werecalculated and parameter curve feature plots were made C-M plot and structureparameter scatter plot showed that that transtpor condition was gravity deposition (i.e.grading suspend) and uniform suspend. Each granularity parameter and curve featuresof representative bores showed strong hydrodynamics in the lower pert and curveweakening hydrodynamics and poor sorting upwards. Accordant result from sizeparameter curves showed that energy varies on different deposition stages.3. A conclude about depositional environment evolving character can be derivedfrom analysis of Lithology feature, Sporopllen, Magnetic susceptibility, Well logfeatures and grain size. The result showed that representative bore was located on thetop of the proluvial fan in middle Pleistocene and proluvial product function impactedmore on this eare. Flood product function was stronger than proluvial productfunction by the change of climate and flood product function became be development.