The researchers studied how different levels of rift activity affected sand distribution in an offshore area called Nanpu Sag. They analyzed fault histories and sedimentary patterns to understand the filling of sand bodies in the basin. By examining core samples and seismic data, they identified different periods of rifting activity and the formation of various sedimentary deposits like fan deltas and river delta deposits. The intensity of tectonic activity remained constant within each period, influencing the vertical stages of sand bodies. The researchers also found that fault activity controlled the distribution of detrital material in the basin, impacting the deposition and filling of sediment.