鲁西河控浅水三角洲沉积体系及煤聚集规律

THE DEPOSITIONAL SYSTEM OF FLUVIAL-CONTROLLED SHALLOWWATER DELTA AND COAL-ACCUMULATION ANALYSIS IN WESTERN SHANDONG

大型河控浅水三角洲沉积体系发育于鲁西石炭二叠纪含煤地层的上部，是晚古生代大规模海退时期陆源碎屑物质快速推进的产物。在论述鲁西河控浅水三角洲沉积体系的成因相及其内部构成基础上，将其划分为上三角洲平原和下三角洲平原两大部分，前者在鲁西地区发育最好。研究表明，河控浅水三角洲沉积体系经历了由发育到废期两个完整的演化阶段，废弃阶段为聚煤作用最强，成煤期最好的时期。而且，聚煤作用与沉积体系废弃延续的时间有关，时间越长，泥炭沼泽发育越普遍，聚煤作用越好。

he large-scale fluvial-controlled shallow-water deltaic depositional system is developed in the upper part of the Permo-Carboniferous coal measure.It is the product of rapid progradation of terrigenous elastic sediments in the period of Lata Paleozoic large scale retreat of sea water.The authors study thoroughly the genetic factes and internal architecture of the depositional system,subdivide the depositional system into two parts:the upper deltaic plain and the lower deltaic plain,the former is developed well in the study area,The study show that the fluvial-controlled shallow-water deltaic depositional system experenced two comprehensive evolution stages,from grownth to abandon. The abandon stage was the best period for coal-accumulating.And the intensity of coal-accumulation was positively related to the lasting time, the more universal the peat swamp and the thicker the coal layers.