研究的材料主要是钻井岩屑样品。
Drill cuttings are the major material for the studied samples.
描述钻井岩屑样品的泥浆测井在地面进行测量和记录数据。
Mud logs that describe samples of drilled cuttings are taken and recorded on surface.
这些样品主要来自钻井泥浆和岩屑，提供了可以用来描述一口井开始生产时的基准数据，样品中同时混合了所有微生物的DNA。
These samples come from drilling mud and cuttings and provide baseline data needed to characterize the well as production begins and comingles all of the microbial DNA.
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