淮南煤田第四含煤段砂体的演化特征及对煤层厚度的控制

讨论了淮南煤田第四含煤段砂体的演化特征及其对 13-1煤层厚度的影响。研究表明, 煤层底板砂体展布型式变化较大, 继承性较差, 反映出网状三角洲平原上分流河道发育特点; 顶板分流河道沉积作用以垂向加积作用为主, 岩体演化具有较好的继承性; 在靠近煤层发育的时期内, 底板砂岩和煤层空间分布呈现互为消长的关系, 而在顶板砂体发育的早期, 砂岩体对下伏煤层的冲刷作用和影响也比较明显。 

Evolvement characteristic of sand bodies in the fourth coal-bearing interval and its control on coal thickness, Huainan coalfield

This paper discussed the evolvement characteristics of sand bodies of the fourth coal bearing interval and its influence on No.13-1 coal-seam thickness in Huainan coal field.The distribution type of sand-mass of coal-seam floor varied greatly and its continuity is worse, which reflected the development characteristics of distributary channel in braid delta-plane. In coal-seam roof,distributary channel sedimentations mostly are vertical accretion, and the continuity of sand body evolvement is well.Closing to the period of coal-seam growth,the space distribution types of sandstones of floor and coal seam are adverse each other;however,in the early time of sand bodies growth, sand bodies flushed and influenced the nether coal-seam obviously.