每一个地质区域包含厚于3千米的地层。 评估单元——可测绘的普通地理特征岩量——被分区测试，按质量评估油气潜力。
Assessment units (AUs)—mappable volumes of rock with common geologic traits—were identified within each province and quantitatively assessed for petroleum potential.
本论文以长江上游地区为研究区域，根据其森林类型将研究区域分为21个评估单元，并建立评估单元指标体系。
We took the upper Yangtze River region as study areas, and divided them into 21 evaluating units according to their forest types, and built up the evaluating units'index system.
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