The scientists studied the sedimentary layers in the Kalashayi Formation in the Tahe Oil Field. They looked at core samples, seismic data, and well logs to understand the types and distribution of sediment types. They found that the formation can be divided into two sequences, each with different types of sediment layers. The northern part has delta sediment, the southern part has tidal flat sediment, and the central part has a mix of both. This information can help predict and locate oil reservoirs in the area.