Field Investigation of the Relative Contributions of Shale Dewatering and Rock Pore Compressibility to the Productive Life of a Geopressured Dissolved Gas Reservoir.

摘要

Analysis of shale dewatering mechanisms indicate the possibility of appreciable water production from geopressured shaly sediments adjacent to permeable confined sandstone reservoir aquifers. The evaluation of geophysical measurements made prior to pressure reduction in hydrocarbon reservoirs as well as after the pressure had been reduced to subhydrostatic levels in these same reservoirs, indicate changes in the shaly sediments that extend appreciable distances from the sand-shale interface. An analysis of the Nodosaria 'A' Reservoir at the Rayne Field, Acadia Parish, Louisiana indicated an appreciable water influx. The calculated water influx below 3000 psi reservoir was probably predominantly from nonshale sources.