According to energyeducation.ca, bing.com, and planet-energies.com, the formation of a good oil deposit requires a specific set of conditions:
It’s important to note that these conditions take millions of years to occur naturally. Most oil deposits today were formed in the Mesozoic age (252 to 66 million years ago), likely due to the tropical climate and large amounts of plankton in the ocean during this period.
Jorge's answer hits many important points. Here are some others: The process of migration from the source to the place where it will be trapped is critical. The largest fields in the world are found where migration of oil was focused into large traps such as reservoir pinch outs or large anticlinal structures. For any oil to accumulate you must have a source, a migration pathway, a seal and a trap. Furthermore, the timing must be right. For example, if the traps form after migration, they will be full of water only.
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