LAUSR

The study of seepage mechanism in shale gas reservoir has been paid more and more attention. The shale gas reservoirs are rich in nanosized pores. The pores in shale matrix can be divided into organic nanopores and inorganic nanopores. At present, there are many literature studies focusing on establishing a model to analyze the gas transport mechanism in shale organic pores. Some researchers also considered the difference of gas transport in organic and inorganic matrix pores, and a mathematical model of inorganic nanopores has been established. However, for inorganic nanopores, most of the models ignore the effect of irreducible water distribution on gas transport, which leads to overestimating of gas transport capability. In this paper, first, based on the weighting coefficient proposed by Wu, the apparent permeability models are established for inorganic nanopores with two different cross-sectional shapes, which are known as cylindrical capillary and slit nanopores. The influence of irreducible water d...