(a) For the purpose of determining the portions of production owned by the persons owning interests in the pooled unit, the production shall be allocated to the respective tracts within the unit in the proportion that the number of surface acres included within each tract bears to the number of surface acres included in the entire unit.
(b) Notwithstanding the provisions in Subsection (a) of this section, if the commission finds that allocation on a surface-acreage basis does not allocate to each tract its fair share, the commission shall allocate the production so that each tract will receive its fair share, which for any nonconsenting owner shall be no less than he would receive under a surface-acreage allocation.