Oil Field (Mega Man ZX Advent)

The Oil Field (ゆでん) is the place the Raider airship fell. The player has to take parts from this place to repair the broken train. It was an ancient dried sea, Ocean Stage /  Subterranean Base from Mega Man X, Launch Octopus's stage.

Stage names

 * Ocean Stage (from Mega Man X credits)
 * Sea Stage (海中ステージ, from Rockman X2: Soul Eraser on Capcom's site)
 * Subterranean Base (from Mega Man Maverick Hunter X stage select screen)

Mega Man ZX Advent

 * Boss: Atlas (Model F)
 * Sub-boss: Desert Aspis
 * Bomb Flower
 * Cannonwalker
 * Circloon
 * Hop Cannon
 * Fire Darts
 * Galleon Assault
 * Galleon Rider
 * Poyoko

Mega Man X

 * Amenhopper
 * Anglerge
 * Blowfish (Gulpfer)
 * Cruiziler
 * Mega Tortoise
 * Sea Attacker
 * Sky Claw
 * Utuboros

* Amenhopper and Mega Tortoise do not appear in Mega Man Xtreme 2.