Oil Ocean Zone:
09 - Used in the Simon Wai Prototype.
2B - Used in the Simon Wai Prototype.
2C - Used in the Simon Wai Prototype.
59 - Used in the Simon Wai Prototype.
5E - Used in the Simon Wai Prototype.
62 - Used in the Simon Wai Prototype.
6D - Used in the Simon Wai Prototype.
73 - Used in the Simon Wai Prototype.
76 - Used in the Simon Wai Prototype.
79 - Used in the Simon Wai Prototype.
81 - Used in the Simon Wai Prototype.
84 - Used in the Simon Wai Prototype.
8A - Used in the Simon Wai Prototype.
94 - Used in the Simon Wai Prototype.
97 - Used in the Simon Wai Proto, but it's completely different.
9E - Used in the Simon Wai Proto, but it's completely different.
A0 - Used in the Simon Wai Prototype.
A5 - Used in the Simon Wai Prototype.
A6 - Used in the Simon Wai Prototype.
AA - Used in the Simon Wai Prototype.
B2 - Used in the Simon Wai Prototype.
BC - Used in the Simon Wai Prototype.
CC - Used in the Simon Wai Prototype.
D0 - Used in the Simon Wai Prototype.
D2 - Used in the Simon Wai Prototype.
D3 - Used in the Simon Wai Prototype.
D6 - Used in the Simon Wai Prototype.
DB - Used in the Simon Wai Prototype.
DC - Used in the Simon Wai Prototype.
DE - Used in the Simon Wai Prototype.
E0 - Used in the Simon Wai Prototype.
E9 - Used in the Simon Wai Prototype.
EA - Used in the Simon Wai Proto, but it's completely different.
F0 - Used in the Simon Wai Prototype.
F5 - Used in the Simon Wai Prototype.
F6 - Used in the Simon Wai Prototype.
F8 - Used in the Simon Wai Prototype.
F9 - Used in the Simon Wai Prototype.
FF - Used in the Simon Wai Prototype.
Note that none of the unused chunks are in the table that the game checks to determine whether or not Sonic & Tails should slide.