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大牛地气田是鄂北塔巴庙大气田的一部分。储层为古生界山西组一段地层,该地层为辫状河三角洲平原辫状河道、分流河道及决口扇砂坝相沉积,对储层的发育最为有利。储集空间主要是充填后残余缩小粒间孔、次生溶蚀孔及少量的微裂缝。由于压实作用、高岭石充填粒间孔及石英次生加大的影响,储层孔喉半径偏小,孔喉结构复杂。孔隙度一般为2％～10％,渗透率平均为0.196×10~(-3)μm~2,按照储层物性划分标准,大牛地储层属低孔特低渗类储层。
The Daniudi gas field is part of the Tabas temple gas field in northern Hubei. The reservoir is the first member of the Shanxi Formation of the Paleozoic. The strata are braided river delta plain braided river channels, distributary channels and faulted fan sand bar deposition, which are most favorable to reservoir development. The main storage space is residual residual shrinkage after filling intergranular pores, secondary corrosion pores and a small amount of micro-cracks. Due to the compaction, the filling of intergranular pores of kaolinite and the secondary effects of quartz, the pore throat radius is small and the pore-throat structure is complex. The porosity is generally 2% ~ 10%, and the average permeability is 0.196 × 10 ~ (-3) μm ~ 2. According to the physical property division criteria, the Daniudi reservoir is a low porosity and low permeability reservoir.