| 试论含煤盆地构造的继承性及砂体对煤灰分的控制 |
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| 引用本文： | 黄操明,周安朝.试论含煤盆地构造的继承性及砂体对煤灰分的控制[J].沉积学报,1995,13(1):102-109. |
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| 作者姓名： | 黄操明 周安朝 |
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| 作者单位： | 山西矿业学院 太原 030029 |
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| 摘 要： | 本文从动态地层学观点，以山西霍县矿区为例编制的一系列煤岩层厚度等值线图，重演了该区晚石炭世至早二叠世的地质演化历史，并探讨了含煤盆地构造发育的继承性。在此基础上进一步阐述了该区砂体对其上煤层中灰分的控制作用，即煤层中的高灰区与下伏砂体常处于错位关系，高灰区的形成是与流经成煤泥炭沼泽并带入其中的细碎屑悬浮物的潜流量较多有关。
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| 关 键 词： | 含煤盆地 构造继承性 砂体 煤层灰分 |
| 收稿时间： | 1993-06-20 |
A Discussion on the Structural Heredity of Coal-bearing Basin and Sandbody's Control on Coal Ash Composition |
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| Institution: | Shanxi Mining Collese, Taiyuan |
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| Abstract: | From the viewPOint of dynamic stratigraphy,and on the basis of series (55 sheets) isopach maPS of coal seam and sandbody in the coal region of Hou County, Shanxi, this study reveals that the prOCess of the development of coal-bearing basin's structure is very clear and is of obvious heredity.Form Benxi annnd Taiyuan age of Late catboniferous Shanxi age of Early Permian, the arrangement direction of all sedimentary bodies in this region is NE-NEE.It is well observed not only on the sand bodies with better orientation, but also on the limestones with worse orientation.This paper introduces 4 isopach maPS, indicating the arrangement of Benxi limestone and sandstone,Taiyuan sandstone under cpal seam No.11 and limestone K2, K3, K4, Shanxi coal seam No.2 and sand they under coal seam No.2.On the basis of the heredity of coal-bearing basin's structure development the derailed analysis and correlation of lotS of isopach maps of coal seam ash content and the isopach maPS of the thickness of sand body under each of the coal seam reveal that the areaof hasher ash'content in all coal seams and the area of each underlying sand they with greaterthickness are in staggered position, in other words, the former is on the thinner belts of the latter or on the POints of disapperance of the latter, for example, the main workable coal seam No.10 and No.11 in the lower pert of Taiyuan FOrmation, the main workable coal seam No.2 and the partly workable coal seam No.1 and corresponding underlying sand theies are the cases.This relationship is even discovered in foreisn reference, for example, in 2 maPS cited by Galloway (1983) fromGairneros(1980), which were redrawn by the authors.It is suggested that the abated relationship depend on the difference of mini relief caused by the existence of underlying sand they in the opt-forming swamp, and the difference of mini relief caused the difference of underground water debit, which flowed through the swamp and brought the fine suspension of clast into it.As for the majority of sand theies and coal seams in the environment of the fluvial channel and the distributary channel of delay, the flood basin beyond the sand body hed a lower relief, so that the groundwater debit, which flowed through the swamp, was greater,and the suspension of clast,which was brought into the swamp, was also more.As discussed above that in these environments the area with thicker coal seam and with thicker sand body are arranged in staggered position, so that in such a case coal ash content in thicker coal seam is higher than in thiner coal seam.As for the coal seam formed on the basis of tidal flat barrier the thicker belt of coal seam and the underlying thicker sand body are in superimPOsed POsition.But in this case high ash content area was located in the place with lower relief far from the tidal flat barrier, where the groundwater debit was greater.The difference in the latter environment is that the higher ash content and underlying sand body by all appearance will have positive effect on the prediction of coal ash content in coal prospecting and is a useful auxiliary mark for the environment recognition. |
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