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油气地球化学勘查的目的是寻找可提供地下深处油气赋存线索的地面和近地面烃聚积。烃的生成范围包括肉眼可见的油气渗漏到只能通过精密分析方法方能测定出来的微量烃。
The purpose of oil-gas geochemical exploration is to find hydrocarbon accumulation on the surface and near-surface that can provide clues for hydrocarbon generation in the deep underground. Hydrocarbon generation ranges include visible oil and gas breakthrough to trace amounts of hydrocarbons that can only be determined by sophisticated analytical methods.