淄博博山地区晚古生代煤系层序地层与聚煤作用

为揭示渤海湾盆地陆表海背景下的煤系层序地层界面形成机制以及层序地层格架内的聚煤作用特征，以淄博博山地区为例开展了本溪组、太原组和山西组的层序地层及聚煤作用研究。研究区内共识别出古构造运动形成的区域性构造不整合面、正常海退形成的下切谷冲刷面、盆地基底构造运动形成的海侵方向转换面、初始海泛面、最大海泛面以及最大海退面等层序界面类型，将研究区含煤地层划分为三个七级层序。经对比研究层序内的煤层的发育特征后认为，潮坪泥炭坪、潟湖及三角洲平原泥炭沼泽为煤层最有利发育相带。SQ2、SQ3、SQ4、SQ5、SQ6层序内均有可采煤层发育。

Sequence Stratigraphy and Coal Accumulation in Late Paleozoic Coal-bearing Strata in Zibo Boshan Area

The Benxi Formation,Taiyuan Formation and Shanxi Formation in the Zibo Boshan area of the Bohai Bay Basin were analyzed to reveal the formation sequence of coal-bearing strata and coal accumulation within the stratigraphic sequence framework,against the background of epicontinental sea in the Late Paleozoic. A series of sequence boundaries following tectonic movement of the basin basement were identified:a regional unconformity surface formed as a result of paleotectonic movement;a scouring surface of incised valleys following normal regression;a transition surface in the transgressive direction;the first flooding surface;the maximum flooding surface;and the lowest regression surface. The coal-bearing strata in the study area occur in seven third-order sequences. A comparative study indicated that the peat flat of the tidal flat,the lagoon and the peat swamp of the delta plain were the most favorable facies belts for the development of coal seams. Recoverable coal seams were developed in sequences SQ2, SQ3, SQ4, SQ5 and SQ6.