摘要
红沙岗勘探区煤系主要为中侏罗统青土井群(J2qn)和下侏罗统芨芨沟群(J1jj),可采煤层均赋存于青土井群之中。其中青土井群总体呈由下向上逐渐变细的正粒序沉积,经历了冲积扇—扇三角洲—湖泊的沉积演化。煤层厚度及层数由边缘向盆地中心方向厚度变薄、层数减少,表明煤层沉积时严格受到边缘冲积扇的控制。
Coal series of Hongshagang area is composed of middle Jurassic Qingtujing Group and lower Jurassic Jijigou Group. The exploitable coal seam are hosted in the Qingtujing Group, which is normal grading sediment, undergone the evolution of alluvial fan-fan delta-lake sediment. From edge to center of basin, thickness of coal seam goes thinner and numbers of seam goes less, it shows that sedimentation of coal bed is controlled strictly by edge alluvial fan.
出处
《甘肃地质》
2007年第3期61-65,共5页
Gansu Geology
关键词
红沙岗
勘探区
煤系
沉积特征
Hongshagang
exploration area
coal series
sedimentary features
