reservoirRock

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: reservoirRock

Indicates that one entity functions as a porous and permeable rock formation capable of storing and transmitting fluids (such as hydrocarbons or water) for another entity.