Micro-pore connectivity affects the seepage and production of shale gas

but there are less research on shale connectivity currently. Taking the Wufeng-Longmaxi formation shale gas reservoir in Pengshui area as an example

the connected pore assemblages of shale gas reservoirs were classified

and then the pore-throat connections of different types of shales were discussed based on a variety of experimental methods. Four types of connected pore assemblages were classified in shale

that is

organic pore interconnection

organic pore-micro-fracture interconnection

organic pore-clay pore interconnection

and clay pore-intergranular pore interconnection. Organic-rich shale

mainly composed of interconnected organic pore assembl

ages

conforms to the short-conduit pore-throat assemblage model with the minimum pore-throat ratio. While medium-low organic shale

mainly composed of interconnected organic pore-clay pore assemblages

is a composite model of short-conduit and tree-shaped pore with the relatively large pore-throat ratio. When the ratio of

TOC

/clay mineral content decreases

the tree-shaped pore-throat ratio increases and the pore-throat ratio decreases. The combination of small pore throat ratio and high content organic pore interconnection is conducive to reducing water lock damage caused by fracturing fluid retention.