济阳坳陷煤成气富集成藏的盆地动力学特征

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。 

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

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-Carboniferous(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.