Research On Coal-forming Environment And Sequence Stratigraphy Of The Permian Carboniferous In Xingtai Coal Field

Xingtai Mining Area is located in the southwest of Hebei Province,east of Taihang Mountain and Gushan anticline,it is an important energy base of Hebei Province.Within the mining area rich in coal resources,coal range,a total of nine pairs within the current mine production and mine is in production,the main coal-bearing strata of Taiyuan and Shanxi,a total of about 12 to 26 layers coal,the main coal seam total of six layers.Based on the previous work of learning,through detailed field profile observed in sedimentology,sequence stratigraphy and other classical theory as a guide to field measured profile data,combined with the regional drilling core data,logging data and other existing achievements,using analysis of the combination of macro and micro methods,detailed classification of Xingtai Mining sedimentary system in the study area Carboniferous-discusses in detail the tidal flat depositional system,delta sedimentary system,rivers within the Permian sedimentary system lake sedimentary system.Based on the above work,the study of the coal mine environment polyethylene,polypropylene coal law,and the establishment of lake sediments into sedimentary environment of coal,coal-forming fan delta depositional environments,coastal lagoons phase alternating coal-forming peat swamp environment,concluded the development and distribution of the different stages of evolution,evolution of sedimentary systems domains and regions rich in coal mining basin.Use vail classical theory had promised stratigraphy,tracking comparative identify stratigraphic sequence Xingtai Mining interface,By studying the variation of the deposition plane,and the reference sequence stratigraphy research other basins in other regions,the establishment of Xingtai Mining Carboniferous-Permian coal-bearing strata sequence stratigraphic framework,divided 3 super sequence,10 three sequences.Combined with the evolution of the basin,the plot development characteristics of systems tracts,flooding surface,sequence stratigraphy,sequence as the basic unit to derive lithofacies paleogeography evolution,investigate the effect of changes in sea level of the lifting sequence unit.Composition and distribution.According to sequence stratigraphy and sedimentary facies analysis of the system of Xingtai Mining ancient geographical features,draw the various coal facies corresponding paleogeographic maps,paleogeographic evolution of the area revealed the reality.