气层“两度”是指有效孔隙度与原始含气饱和度，它是计算天然气储量的重要参数。
The effective porosity and original gas saturation of gas reservoir are the important parameters in calculating gas reserves.
开采以前天然气气藏里的天然气容量。OGIP是原始天然气地质储量的缩写。
The volume of gas in a reservoir before production. OGIP is the abbreviation of original gas-in-place.
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