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。

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After plaintiffs' attorneys rested their case Wednesday, U.S. District Judge Carl Barbier ruled there was no evidence that BP's drilling fluids contractor M-I LLC made any decision that led to the blowout of BP's Macondo well.

NPR: Claims Against BP Contractors Dismissed At Trial