The study in Huaqing area Yanchang 6_3 sand group focused on analyzing different types of sedimentary microfacies. By examining core samples and using sedimentary facies flags with logging, researchers identified subaqueous distributary channel, bay, turbidite channel sand, and deep lake mud microfacies. They conducted a detailed analysis of these microfacies to understand their distribution in the area. The goal was to provide a better basis for petroleum exploration in the Ordos basin.