黄河北煤田潮坪沉积体系及成煤作用

黄河北煤田煤系广泛发育潮坪沉积体系,通过对其沉积特征及沉积模式的研究,认为潮坪沉积体系主要包括潮道（潮沟或潮渠）、泥坪、沙坪、砂泥混合坪及潮坪沼泽和潮坪泥炭沼泽相等沉积相类型,其特征是砂泥比值较高,沉积厚度大,为含煤地层发育提供物质基础;在沉积环境演化方面与整个鲁西南地区沉积特征相似,整体为海水逐渐衰退的过程;在潮坪沼泽和潮坪泥炭沼泽中形成含硫量相对较高的煤层与海平面的变化密不可分,潮坪沉积物中发育的10煤、8煤、7煤、6煤等与潮坪泥炭沼泽沉积在该区分布特点具有一致性,由此可知,潮坪沉积体系的沉积物与煤层形成特点和形成规律有着密切关系,为研究区成煤作用研究提供了理论依据。

Tidal Flat Sedimentary System and Coal-forming in Huanghebei Coalfield

Tidal flat sedimentary system has widely developed in coal measures in the Huanghebei coalfield. After studies on sedimentary features and sedimentary model have considered that the tidal flat system main sedimentary facies included tidal channel（tidal creek or tidal trench）, mud flat, sand flat, mixed sand-mud flat, tidal flat swamp, and tidal flat peat bog facies. Their characteristics have high sand-mud ratio, large deposit thickness, thus provided coal-bearing strata development with material basis. In connection with sedimentary environment evolution is similar to sedimentary features in whole southwestern Shandong area, a gradual retreat process of sea water as a whole. In tidal flat swamp and tidal flat peat bog have formed coal seams with relatively high sulfur content, closely related to sea level variation. Coal seams Nos.10, 8, 7 and 6 developed in tidal flat deposits have consistency with distribution features of tidal flat peat bog deposit in the area. It follows that the close relation between deposits of tidal flat system and coal seam formation characteristics and formation pattern. So that have provided theoretical basis to the study of coal-forming process in the area.