Petroleum Well Symbols Explanation

A well's Symbol designation is based on its status and history. The symbol scheme employs a set of basic symbols to which "modifiers" can be added to impart additional information.

The complete set of IGS Petroleum Well Map Symbols is available at the Help Topic Well Symbols.

Basic Well Symbols

Symbol	Description	Symbol	Description
	permitted location		salt water disposal
	dry hole (dry and abandoned) (D&A)		salt water disposal formerly oil
	oil		salt water disposal formerly gas
	gas		salt water disposal formerly gas storage
	oil and gas		potable water supply
	gas storage		non-potable water supply
	gas storage formerly oil		non-potable water supply, formerly oil
	gas storage formerly gas		waste disposal
	water injection (waterflood)		temporarily abandoned new well
	water injection formerly oil		confidential well
	water injection formerly gas		confidential workover
	water injection formerly oil and gas		boring
	observation		stratigraphic/structure test
	observation formerly gas storage		surface location of deviated hole
	nothing known, old Trenton well from map

Symbol Modifiers

Graphic "modifiers" may be added to any standard IGS well symbol to denote additional criteria (modifiers are shown in red, added to enlarged gas well symbol):


Abandoned	Location Uncertain	Completion Type Uncertain	Temporarily Abandoned	Dual Completion