(a) Tax credits earned under this chapter may only be applied against the severance taxes imposed by Chapters 201 and 202 of this code. The tax credit may not be used until September 1, 1995, and may not be used after August 31, 2000. The tax credit may be applied to either oil or gas severance taxes regardless of the field from which the production originates.
(b) Tax credits provided under this chapter shall only be available if at the time the application for a tax credit is made, the discovery well that is the basis for the tax credit is producing oil or gas from the discovery field.