济阳坳陷煤成气富集成藏的盆地动力学特征

Basin dynamical features of coal-related gas assemblage in Jiyang Depression

济阳地区具有煤成气聚集成藏的物质基础和盆地动力学背景。主要表现在石炭—二叠系在济阳坳陷的某些中、新生代断陷区块内保存完整,以含煤地层为主要特色的生烃生气岩系发育;石炭—二叠系上部(如上石盒子组分布广泛而稳定的砂岩)具有良好的储层发育条件,区域盖层为煤成气成藏创造了封闭条件。因此,石炭—二叠系本身具有良好的生、储、盖组合序列,是济阳坳陷煤成气聚集成藏的最重要地质条件。

Jiyang area is of the material base and the dynamic background for the assemblage of the coal- related gas. That is, the Permo- Carboniferous strata are preserved well in some fault- blocks of Mesozoic- Cenozoic era in Jiyang Depression. The rock series producing the hydrocarbon and the gas have developed which are characterized by the coal - bearing strata. The upper strata of Permo - Carbonifemus（ for example, broadly and stably distributed upper Shihezi Formation sandstones） are of good condition for reservoir development. The regional caps produced the confining condition for the coal- related gas enriching into the deposits. Therefore, the Permo - Carboniferous strata possessing the good assemblage of the source, the reservoir and the cap are of the most important geological condition for the coal - related gas enriching into the deposits in Jiyang Depression.