What is rock with unconnected pores?

Rock with unconnected pores is typically referred to as "tight" or "impermeable" rock. This type of rock has pores that do not interconnect, which prevents the flow of fluids through it. As a result, it often acts as a barrier to groundwater or hydrocarbons, making it less effective as a reservoir compared to porous rocks with well-connected pore networks. Examples include certain types of shale or dense limestones.