Stratigraphic structure exploration in the southern margin of Nankang basin in Beibu Gulf based on 2D seismic data

Near surface two−dimensional seismic data are widely used in stratigraphic structure detection, but there are few cases of extracting relevant attributes from two−dimensional seismic data volume and applying them to sedimentary environment interpretation. By using a variety of pre−stack noise removal, amplitude compensation, deconvolution, high−precision velocity analysis and stacking processing techniques, a stacked seismic profile with high signal−to−noise ratio for stratigraphic structure division and attribute extraction is obtained. In this paper, the T0 values of basin basement are extracted, and the seismic attributes such as root mean square amplitude, instantaneous frequency, dominant frequency and bandwidth are optimized. The T0 spatial distribution map of the basement burial depth and the distribution map of relevant seismic attributes are calculated. The results show that the buried depth in the northwest of the basin basement is less than that in the southeast, showing a trend of dipping in to the sea from northwest to southeast; the basement target sedimentary environment with shallow burial depth corresponds to high root mean square amplitude and high bandwidth. The basement target sedimentary environment with large burial depth corresponds to low root mean square amplitude and low bandwidth, and the instantaneous frequency and dominant frequency also present low values.