Relating to the ownership of the pore space underlying the surface of land.

This bill clarifies that, by default, the owner of surface land in Texas owns the pore space (geologic voids and cavities beneath the surface) unless a deed, lease, or contract specifies otherwise. It directly affects surface landowners and entities involved in subsurface activities like oil and gas extraction, as it establishes surface ownership as the default for pore space. The law explicitly states it does not change existing common law governing mineral rights versus surface rights. This provision aims to reduce legal uncertainty about subsurface ownership in Texas.