其目的是为了将岩心的变化降到最低，通常用泥浆或水基、油基泥浆钻取岩心，但是使用少量的化学添加剂和加重物质。

Since the purpose is to minimize alteration, a fresh core has often been drilled with a bland mud, either water - or oil-base, but with a minimum of chemical additives and weighting material.

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但实际上使用的添加剂是二甘醇，一种通常用于汽车防冻剂的低成本代用品。

But it was really (diethylene glycol), a low-cost substitute commonly used in automobile antifreeze.

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