辽宁红阳煤田石炭—二叠纪聚煤期古地理与控煤分析  

Permo-Carboniferous Coal-accumulating Period Paleogeography and Coal Controlling in Hongyang Coalfield

作　　者：张新福 逄礡 马金利 周效志[2] 

机构地区：[1]东北煤田地质局一0三勘探队,辽宁沈阳111000 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国煤炭地质》2010年第7期1-6,15,共7页Coal Geology of China

基　　金：国土资源大调查项目"全国煤炭资源潜力评价工作"资助

摘　　要：依据华北地台晚古生代陆表海沉积建造层序界面的识别标志,在红阳煤田石炭—二叠系残余地层中识别出了6个层序界面,并据此建立了由DS1-DS55个三级层序构成的层序地层格架,揭示了红阳煤田石炭—二叠纪沉积环境由海相到陆相演化的过程。DS1-DS5层序地层岩性岩相分析表明:DS2、DS3层序是石炭—二叠纪主要聚煤期。DS2层序发育堡岛体系,岛后泥炭坪与滨岸沼泽相沉积在区内形成了厚度较大且连续性较好的12、13煤;DS3层序发育三角洲体系,泛滥盆地与分流间湾相沉积发育了多层不可采或局部可采煤层。与DS3层序海陆过渡相沉积成煤相比,DS2层序海相沉积煤层的灰分与硫分相对较高,且在区域上都呈现由北向南逐渐升高的趋势,这与海水退出红阳煤田的方向相吻合,表明红阳煤田石炭—二叠纪聚煤期古地理格局对煤层发育及煤质特征具有明显的控制作用。Based on the Late Paleozoic epicontinental sea sedimentary formation sequence boundary identification marks in the North China platform,have identified 6 sequence boundaries in Permo-Carboniferous residual strata in the Hongyang coalfield,thereout established sequence stratigraphic framework composed of 5 third order sequences from DS1 to DS5,and revealed the evolution process of Permo-Carboniferous sedimentary environment from marine facies to continental facies in the Hongyang coalfield.DS1-DS5 sequence stratigraphy lithologic and lithofacies analyses show that： DS2 and DS3 are the main sequences of coal-accumulating during Permo-Carboniferous.During DS2 stage mainly developed a barrier island system;in back island peat flat and coastal bog sediments formed thick and continuous Nos.12 and 13 coal seams in the area.DS3 stage mainly developed a delta regime,in flood basin and interdistributary bay sediments formed multilayered nonmineable or locally mineable coal seams.Compared with the transitional facies sedimentary of DS3,the coal seams have relatively high ash and sulfur in DS2 marine sequence.In addition,all the mineable coal seams show an increasing trend of ash and sulfur from north to south regionally,which is identical to the direction of marine regression,showing the paleogeographic pattern obviously controlled coal seam development and coal quality characters.

关 键 词：层序地层格架 岩相古地理 控煤作用 石炭二叠纪 红阳煤田 

分 类 号：P531[天文地球—古生物学与地层学]