However, most of undeveloped new blocks are low-grade reservoirs with many development difficulties such as super heavy oil, low permeability, thin bed and deep pay.
而尚未开发的新区大多属于超稠油、低渗、薄层或深层等开采难度较大的低品位油藏。
The study on air injection mainly aims at the heavy oil in China, but most of low permeability reservoirs are light oil reservoirs.
低渗透油藏大多属于轻质油藏，轻质油藏注空气已经越来越受到人们的关注。
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