吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩，并有煤层变薄现象。
In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
煤田构造主要受北北东向构造所控制，其煤层构造变薄带也主要呈北北东向伸展。
Coalfield structure was controlled by NNE structure. Coal bed structure thinning belt was also extended in NNE directions, Southern Hebei coalfield.
向河道方向，煤层分叉变薄，灰分高，向碎屑岩过渡。
Near the distributary channel, coal layer divarication and pinch-out, with high ash content, and transition to clastic rock.
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