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By repeating seismetic mesurments you can create 3d models which again is used to create a 3d map of the sea-ground.
When the data is dated, then you are building a 3d modal divided into small blocks with difrent values to calculate oil and gas. Then you can calculate and indicate the best placement to place the oil rig. This is called a reservoir model.
From the data you have gathered you can calculate where the oil will float when you drilll somewere. Then based on resisitivity and conductivity then you can figure out where there is water and gas to avoid problems later on.
Then from the core of the rocks, you can calculate how much gas, water and oil there can be inside the rock. Then what you would do is to multiply that value with the recovery factor, and that will be the amount you can sell to the market. A typical recovery factor is 50 to 70 percent.
This calculation is done with each brick in the reservoir model.
Then the final part is how much you can actually produce from the platform. That will let you know wether or not you should use a boat, a huge platform, a small platform or whatever is most suited for the reservoir.
The way the oil rigs get all the oil up is by pushing the oil by pumping water inside from the other end of the oil trap. The water is always pumped from below the oil that way the oil will always float to the top and the oil can be pumped up into the oil rig.