Comment by colechristensen

Half-ish (don't get hung up on being exact, they are at least of similar orders of magnitude) of the oil that makes its way into the ocean is natural. That is, leaking out of the ground into the water not at all as a result of human activity. Obviously enormous anthropogenic oil spills make this a very spiky statistic one way or the other.

Oil production and natural oil seepage happen in the gulf of mexico because there's oil there, there's not much oil around Hawaii.

So there's likely both a human and non-human reason for this in Texas.