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在美国致密气藏,正以一个不断增长的速率开采。最近美国的几个致密气藏正在进行多层合采,且证明是经济可行的。Pinedale背斜地区在确定最佳增产措施时面临着挑战,在70个分散的砂岩地层要进行22次增产处理,层段厚度超过6000ft。因渗透率变化幅度达两个数量级,孔隙压力梯度在0.22~0.83psi/ft范围内变化,储层评价十分复杂。
Tight gas reservoirs in the United States are being mined at an ever-increasing rate. Recently, several tight gas reservoirs in the United States are being multi-layered and proven to be economically viable. The Pinedale anticline area faces challenges in determining optimal stimulation measures, with 22 stimulation outputs in 70 scattered sandstone formations with more than 6,000 ft of interval. Because of the two orders of magnitude variation of permeability and the change of pore pressure gradient in the range of 0.22-0.83psi / ft, reservoir evaluation is very complicated.