Revenue to Land Owners?

How is the revenue to land owners calculated? This is something that has always puzzled me. There is a history of cheating and corruption involved with this. Now in South Texas most of the drilling is deep in to pools of oil that span hundreds of miles. These pools sit underneath the land of many different people but only a few end up getting revenue. In reality everyone in an entire region who owns land should receive a portion of the revenue. There are many examples of one land owner making millions per year of oil and a neighbor makes nothing. How is this possible when in truth the oil is under both properties.
I sure that the oil leasing procedure really needs to be looked at and changed if possible. Again in Texas big oil companies and big oil landowners have incredible power and control in the state. Later.