短語詞組短語gravity conjunction drainage curve 重力排油曲線gravity flow drainage 自流排水gravity rain drainage 重力式排水gravity conjunction drainage 重力排水gravity conjunction drainage reservoir 重力排儲(chǔ)層gravity drainage system 重力排水系統(tǒng)gravity drainage pool 重力泄油油藏gravity drainage field 重力敺油田gravity drainage reservoir [地質(zhì)]重力排儲(chǔ)層 返回 gravity drainage