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靖边气田是鄂尔多斯盆地发现的第一个也是唯一一个整装的世界级大气田,从靖边气田的特征出发,探究其发展形成的规律。靖边气田有两套烃源岩,即上古生界烃源岩和下古生界烃源岩。气田主体赋存的层位马家沟组是一套海相碳酸盐岩,含气有利层为马4段和马5段,区域上分布稳定。盖层为下古生界风化壳上发育的石炭系区域性铝土盖层,上古生界发育多套封盖层,封闭性极好。气田主要赋存于盆地奥陶系风化壳上的大型岩性-古地貌复合圈闭之中。正是集中这些所有的要素盆地下古生界才有了靖边气田的形成。
The Jingbian gas field is the first and only integrated world-class gas field discovered in the Ordos Basin. Based on the characteristics of the Jingbian gas field, the law of its formation and development is explored. There are two sets of source rocks in Jingbian gas field, namely, Upper Paleozoic source rocks and Lower Paleozoic source rocks. The main strata in the gas field Majiagou Formation is a set of marine carbonate rocks. The gas-bearing favorable layers are Ma 4 and Ma 5, with stable distribution in the area. The caprock is a Carboniferous regional bauxite caprock developed on the Lower Paleozoic weathering crust. The Upper Paleozoic develops multiple sets of seal layers with excellent sealing properties. The gas field mainly occurs in the large-scale lithologic-paleogeomorphic composite trap on the Ordovician weathering crust in the basin. It is precisely because of the formation of the Jingbian gas field that the Lower Paleozoic concentrated all these elements.