They live in fresh water of streams, lakes and thermal springs, moist soil , and mud .
他们住在淡水的河流，湖泊和热泉水，潮湿的土壤，泥浆。
The formation water in L area, M Basin is fresh. The natures of drilling mud vary with different drilling depth. There is a complicated relationship between electric properties of water and oil.
盆地L区地层水为淡水类型，各井随埋深的不同及钻井泥浆性能的不同，油、水电性识别极为困难。
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.
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。
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