What are the properties and source of seal rock?

Seal rock is a geological formation that possesses specific properties, including low permeability and high porosity, which make it effective in trapping hydrocarbons. It is typically composed of fine-grained sediments, such as shales or mudstones, that can prevent the migration of oil and gas. The source of seal rock often includes organic-rich materials deposited in marine environments, which, over geological time, have transformed into impermeable layers that serve as barriers in petroleum systems. These characteristics are crucial for creating reservoirs that can store significant amounts of hydrocarbons.