I don't know about "high pressure" oil, but back in the good old days many oil reservoirs were overpressured...that is why they blow out and don't need to be pumped (when the pressure drops, they need to be pumped). It is known that certain fields...I think the example I heard is in Gulf of Mexico, produce more than they should and must be sourced from deep via faults. 3D imaging is so good that you can actually see oil and/or gas leaking out of one reservoir and into another...

Oil at the Silverthread Oil Field is flowing out of the San Cayetano fault (which outcrops)...this is one of the fastest slipping thrust faults in southern California. If it is water that is going to show the pressure pulse, then the water will affect the oil. The oil might be noticed flowing, while water would not as easily (e.g., this page, or the seeps in Santa Barbara Channel...no doubt visible from space...if water...would not show to well in an ocean..

Also...when I say oil seeps...there is a lot of gas coming out with the oil in Santa Barbara Channel.
Speaking of oil and faults...I measured horizontal striations in hard tar on the Hosgri fault at Pt. Arguello....this is the only place it comes onshore...and it is only onshore for a few 10s of m. This was significant because many, esp. USGS, were saying the Hosgri was a thrust fault....the orientation of the folding near it also does not allow it to be a thrust fault...

More on oil and active faulting: Edwards (1998) pointed out that the oil water contact is tilted consistent with folding at Carpinteria anticline...folding so fast it can't equilibrate. Work we are doing supports some exceptionally fast folding/fold propagation in that area...above big faults that dip under the mainland coast...Carpinteria to Santa Barbara to Goleta..
Chris