文 2 3气藏是东濮凹陷典型的煤成气块状砂岩气藏 ,气源为石炭二叠系 ( C-P)煤系地层。气源岩有机质丰度高、性质好 ,天然气与气源岩地化指标具有很好的可对比性。该气藏储层发育 ,单层厚度大 ,分布稳定 ,连通性好 ,储层岩性为粉砂岩、细粉砂岩 ,属中低孔低渗致密储层。气藏圈闭条件好 ,为在基岩隆起背景上长期发育形成的背斜构造。气藏之上覆盖有巨厚的盐岩盖层 (文 2 3盐 ) ,使得文 2 3气藏得到很好的保存 Wen 2 3 gas reservoir is a typical coal-formed gas sandstone gas reservoir in Dongpu sag, with gas source of Carboniferous Permian (C-P) coal series. The gas source rocks have high organic matter abundance and good nature, and the geochemical indicators of natural gas and gas source rocks have good comparability. The gas reservoirs are developed with large single layer thickness, stable distribution and good connectivity. The reservoir lithology is siltstone and fine siltstone, which belongs to the medium and low porosity and low permeability tight reservoir. Gas reservoirs are well trapped and are anticlinal structures developed over a long period of time on the basement uplift background. Above the gas reservoir is covered with a thick salt rock cover (Wen 2 3 salt), so Wen 2 3 gas reservoir is well preserved