More basins than any other state.
Texas is the most productive oil and gas state in the country, and it is not close. Multiple world-class plays operate simultaneously across different parts of the state. The Permian Basin in West Texas is the current star, accounting for the majority of state oil production. The Eagle Ford in South Texas produces both oil and gas. The Haynesville in East Texas is a major dry-gas play. The Barnett near Fort Worth pioneered modern shale development.
Each of these plays has its own geology, its own operator roster, and its own typical mineral ownership patterns. A family that inherited Texas minerals might be in any one of these, or sometimes more than one.
Texas mineral law is also unusual. The state is strongly private-property-oriented, and mineral ownership is often separated from surface ownership through layers of historical transactions. Understanding what you actually own in Texas sometimes requires tracing back a century of deed records.