the compressibility of water is on the order of 4 x 10^-6 vol/vol/psi. the pore volume it occupies has a similar compressibility. that is the basis for a water driven oil reservoir.

that doesn't explain 1.3 million bpd though.

They drilled down through mudstone and hit hot, pressurized water. I thought the flow was 660kbbl/day of mud, not 1.3mbbl.

Ground is subsiding