Sand production is an important factor, which affects oil well productivity.
出砂是影响油井生产能力的一个重要因素。
The enrichment factor of mainly absorbent element is also high under dust and sand weather conditions.
亲地壳元素中的主成分元素在有沙尘天气时，其富集因子也偏高。
The enrichment factor of sand aerosol which relate to crust and loess is the highest for absorbent sulphate and sedimental elements.
沙尘气溶胶相对地壳和黄土的富集因子，以亲硫元素和亲沉积层元素为最高。
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