Study On The Sedimentary Environment Of Taiyuan Formation In Yangquan Xinjing Mine

Papers of theories and methods of sequence stratigraphy, petrology, sedimentology, gas geology, Yangquan new King Mine Formation sedimentary sequence stratigraphy, lithofacies paleogeography, depositional environment and Gas Fusave the relationship and other aspects of the research.3-188, drilling core of the study area, field observations and laboratory tests,160drilling data, the study area gas content analysis. Phase flag of the XinJing Mine Taiyuan group identified the barrier island,lagoon,wadden,open platform, and restricted platform subfacies, four kinds of sedimentary microfacies.Sequence boundary water into surface water into the face recognition study area Taiyuan group is divided into4third-order sequences,8systems tracts, summed up the characteristics of sequence stratigraphy, the establishment of the region sequence stratigraphic framework. The SQ1period, the study area developed transgressive system tract and highstand system tract, the ancient geographical landscape is given priority to with barrier bar and lagoon-tidal flat, barrier bar is major developed in the northeast and in the southwest tidal flat deposit is major developed, the transgression is in the northeast. The SQ2period, tidal flat and peat swamp is mainly developed in the transgressive system, the early highstand system mainly develops carbonate platform, late gradually transition to the lagoon-tidal flat deposit, water mainly from southeast. The SQ3period, barrier bar and lagoon-tidal flat depotit is mainly developed in the transgressive system tract, it has a wide distribution of barrier bar, peat bog is local visible. The SQ4period, barrier bar and lagoon-tidal flat depotit is mainly developed in the transgressive system tract, the early highstand system tract mainly develops carbonate platform, the late transition to lagoon tidal flat deposit.Sedimntary environment and gas occurrence is related, mainly in coal thickness, roof limestone thickness and bottom thickness of mudstone, coal and other effects on gas occurrence. Through the study of coal seam thickness has small effect on gas occurrence in the study area, the larger the thickness of limestone and mudstone of coal seam roof, the greater impact on the gas occurrence.