青海聚乎更矿区侏罗纪含煤岩系层序地层研究

运用钻井岩心及层序地层学有关理论、方法，对木里煤田聚乎更矿区中侏罗统含煤岩系进行了层序地层学研究，共识别包括区域不整合面、河流下切谷及河道间6个层序界面，将侏罗系含煤岩系划分为5个三级层序。全区发育的厚煤层常横跨不同相区连续分布（如下．煤层），厚煤层的形成主要受控于可容空间的增加速率与泥炭堆积速率的关系。陆相含煤盆地三级层序湖侵体系域聚煤作用最好，煤层厚度的变化则与煤层下伏沉积相有一定关系。

A Sequence Stratigraphic Discussion of the Jurassic Coal Measures in the Juhugeng Coalmine Area in Qinghai Province

The sequence stratigraphy of the Middle Jurassic coal-bearing measures in the Juhugeng mine area in Qinghai Province was studied by using the core and logging data. A total of 6 sequence boundaries were identified, which are characterized by incised valley fill coarse-grained sandstone at diseonformities as well as paleosoils in the inter-fluvial area. These sequence boundaries have divided the Middle Jurassic into 5 third-order sequences. The major coals in the research area are extensively distributed across different sedimentary facies belts. Deposition of the thick coals was controlled by the peat accumulation rate in balance with rates in creation of accommodation. The thick coals in the research area tend to be accumulated at lake transgressive systems tract where the higher peat accumulation rotes were matched by the higher accommodation creation rates. The variation of thickness of coal seams was controlled by the sedimentary facies beneath the coal seams.