The study looked at how different fluids in underground reservoirs affect seismic waves. By analyzing data from wells and using computer models, researchers found that the type of fluid in a reservoir can impact how seismic data looks. They identified two major oil-rich areas in the field and found that the seismic data is more influenced by the rock type than the fluid inside. Replacing the fluid with gas or oil didn't change the seismic data much. This means that just looking at seismic data isn't enough to predict where oil is, as the rock type plays a bigger role in shaping the data.