* Why are there marked differences in oil gravity, wax content, and sulfur content in lateral and stratigraphically successive sands?
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* Why are there marked differences in [[Wikipedia:API gravity|oil gravity]], wax content, and sulfur content in lateral and stratigraphically successive sands?
* Why are there differences in water salinity for multiple sands in one [[structural trap system|structural trap]]?
* Why are there differences in water salinity for multiple sands in one [[structural trap system|structural trap]]?
* What is the role of [[fault]]s in transporting and trapping hydrocarbons?
* What is the role of [[fault]]s in transporting and trapping hydrocarbons?