introduce the CHN-BQ which is a rock Classification method

CHN-BQ is a rock classification method used in geology to classify rocks based on their chemical composition. The acronym stands for Carbon, Hydrogen, Nitrogen, and the ratio of Benzene to Quinoline. These elements and their ratios are used to determine the organic content of a rock, which can be an indicator of its origin and formation. The CHN-BQ method is commonly used in petroleum exploration and is particularly useful for identifying source rocks, which are rocks that have the potential to generate and contain hydrocarbons. By understanding the organic content of a rock, geologists can better predict the quality and quantity of oil and gas reserves in a given area.