Plate tectonics... oh wait... that theory has only been around since the 60's so I guess it's not set in stone like the dinosaurs-to-hydrocarbons-is-the-only-way theory.

Although that doesn't explain why NASA found hydrocarbons on Titan. So I guess dinosaur space travel is the next 'logical' explanation for where those hydrocarbons came from.
Carbon is one of the most abundant elements in the universe (Carbon-12 isotope is the 4th most abundant if I'm not mistaken). It's hard to look anywhere and not find it. Hydrogen is the number 1 most abundant element in the universe.
People always say oil comes from dinosaurs and I think that is one of the big problems many people have with the "where oil comes from". Sure there's a small portion of oil that was produced from our long gone dino friends but crude oil is made from "organic matter" and not just dinosaurs.
I doubt I could say it better than this article.
Petroleum - Wikipedia, the free encyclopedia
"Geologists view crude oil and natural gas as the product of compression and heating of ancient organic materials (i.e. kerogen) over geological time. Formation of petroleum occurs from hydrocarbon pyrolysis, in a variety of mostly endothermic reactions at high temperature and/or pressure.[13] Today's oil formed from the preserved remains of prehistoric zooplankton and algae, which had settled to a sea or lake bottom in large quantities under anoxic conditions (the remains of prehistoric terrestrial plants, on the other hand, tended to form coal). Over geological time the organic matter mixed with mud, and was buried under heavy layers of sediment resulting in high levels of heat and pressure (known as diagenesis). This caused the organic matter to chemically change, first into a waxy material known as kerogen which is found in various oil shales around the world, and then with more heat into liquid and gaseous hydrocarbons in a process known as catagenesis.
Geologists often refer to the temperature range in which oil forms as an "oil window"å‚*elow the minimum temperature oil remains trapped in the form of kerogen, and above the maximum temperature the oil is converted to natural gas through the process of thermal cracking. Although this temperature range is found at different depths below the surface throughout the world, a typical depth for the oil window is 4? km. Sometimes, oil which is formed at extreme depths may migrate and become trapped at much shallower depths than where it was formed. The Athabasca Oil Sands is one example of this.
A number of geologists in Russia adhere to the abiogenic petroleum origin hypothesis and maintain that hydrocarbons of purely inorganic origin exist within Earth's interior. Astronomer Thomas Gold championed the theory in the Western world by supporting the work done by Nikolai Kudryavtsev in the 1950s. It is currently supported primarily by Kenney and Krayushkin.
The abiogenic origin hypothesis lacks scientific support. Extensive research into the chemical structure of kerogen has identified bacterial cells as the primary source of oil. The abiogenic origin hypothesis fails to explain the presence of these markers in kerogen and oil, as well as failing to explain how inorganic origin could be achieved at temperatures and pressures sufficient to convert kerogen to graphite. It has not been successfully used in uncovering oil deposits by geologists, as the hypothesis lacks any mechanism for determining where the process may occur."