英语翻译

英语翻译
Acid gas injection in Western Canada occurs over a wide
range of formation and reservoir types,acid gas compositions
and operating conditions.Injection takes place in deep saline
formations at 27 sites,into depleted oil and/or gas reservoirs at
19 sites and into the underlying water leg of depleted oil and gas
reservoirs at 4 sites.Carbonates form the reservoir at 29 sites
and quartz-rich sandstones dominate at the remaining 21 (Figure
5.13).In most cases,shale constitutes the overlying confining
unit (caprock),with the remainder of the injection zones being
confined by tight limestones,evaporites and anhydrites.
大致意思准确,通顺的,