榆林气田目的层系位于上古生界二叠系山西组底部。
The target strata in Yulin gas field lie in the bottom of Shanxi Formation of Permian, Upper Palaeozoic.
长庆气田上古生界气藏属低压低渗储层。
The upper Paleozoic reservoir in Changqing gas-field is a low pressure and low permeability reservoir.
上个世纪70年代文留煤型油气田的发现，标志着华北上古生界油气田勘探进入了一个新阶段。
In 1970s, the discovery of Wenliu coal-formed field marked a new period of Neopaleozoic field exploration in North China.
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