大气降水渗入地下的过程中渗流水不仅能把地表附近细小的破碎物质带走，还能把周围岩石中易溶成分溶解带走。经过渗流水的物理和化学作用后，地表附近岩石逐渐失去其完整性、致密性，残留在原地的的则未被冲走，又不易溶解的松散物质，这个过程称淋滤作用，残留在原地的松散物质称残积层。
n. eluviation
试验发现，淋滤作用有利于垂直有效应力的传递；
It is also discovered that leachating is in favor of the transferring of vertical effective stress.
风化淋滤作用形成的储层沥青主要沿断层和不整合面分布。
The reservoir bitumen formed by weathering are usually distributed along a fault and a uncomformity.
古大气水淋滤作用是改善不整合面附近储层物性的重要因素。
The ancient meteoric water eluviation is the important way to improve reservoir physical properties under the unconformity.
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