The researchers discovered a new type of sedimentary formation called a sublacustrine slump turbidite fan in the Chang 6 oil-bearing formation in China. This formation consists mainly of microfine feldspar sandstone with specific sedimentary features like graded bedding and deformational structures. By studying the lithofacies associations and deposition sequence, the researchers identified the genetic mechanism of this fan and its significance in developing oil reservoirs in the area.