Method for determining content of organic pollutants in oil-based drilling fluid in rock debris by using internal standard method

The invention discloses a method for determining the content of organic pollutants in oil-based drilling fluid in rock debris by using an internal standard method. The method comprises the following steps: adding an internal standard substance with a fixed proportion into base oil of the oil-based drilling fluid; oil-based drilling fluid polluted rock debris is taken, cleaned and dried; taking the cleaned and dried rock debris sample, carrying out rock pyrolysis analysis, and calculating S1 + S2; taking the cleaned and dried rock debris sample to carry out rock extract content determination; the method comprises the following steps: carrying out extract group component analysis on a rock extract, and quantitatively determining the contents of saturated hydrocarbon, aromatic hydrocarbon, non-hydrocarbon and asphaltene components; analyzing the saturated hydrocarbon component by using a gas chromatographic method, and calculating the normalized percentage content of the internal standard substance in the satura