摘要
黔西南上二叠统为以碎屑沉积为主的含煤层序。该层序包括3个沉积体系域,下部体系域为海湾—泻湖体系沉积,中部体系域为三角洲体系和障壁坝—泻湖体系沉积,上部体系域为碎屑海岸体系沉积,总体反映海平面上升过程。煤层分布范围随海平面上升不断由东向西后退,主要煤层富集与最大进积期有关,即赋存于下部体系域上部和中部体系域。因此,利用海平面升降旋回可较好地预测煤层分布范围及主要煤层赋存规律。
Upper Permian in southwestern Guizhou consists of a coal-bearing sequence dominated by clastics, which can be divided into three system tracts. Lower system tract contains bay-lagoon system, middle system tract contains delta system and barrier-lagoon system,Upper system tract, clastic beach system in research area. There deposit in sealevel riffing period. Distribution of coalbed is forced to step backward to land with the rifting of sealevel fluctuation. The accumulation of main coalbed is closely related with main prograding period, main coalseams occur in the upper part of lower system tract and middle system tract. Hence, based on the transgressive-regressive cycles, the occurence of main coalseams can be effectively predicted.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
1992年第5期1-6,共6页
Coal Geology & Exploration
关键词
煤矿
煤
聚积
晚二叠世
海退
沉积
Guizhou
Late Permian Epoch
coal-bearing formation
sedimentary cycles
