Sedimentary architecture of the Central Canyon in L area of Qiongdongnan Basin and their evolution and controlling factors

The sedimentary architecture and evolution of submarine canyons have received considerable attention in the deep water research. Based on the high-resolution 3D seismic data around 300 km² from the L area of Qiongdongnan Basin and the regional geological data, using seismic facies analysis and seismic attribute technology as means, this paper analyzes the 3D characteristics of the sedimentary architecture of the central canyon during Huangliu Period. We reach the followings as conclusions: There are six kinds of sedimentary units in the Central Canyon, namely, mass transport deposits, gravity flow channel deposits, levee deposits, basal lag deposits, lobe deposits, hemipelagic drapes deposits; According to the relative strength of erosion and sedimentation, the gravity flow channel in the study area can be classified into erosional and accretional channels, and according to the restrictive strength, they can be classified into strongly restricted channels, weakly restricted channels and non-restricted channels; The whole canyon can be regarded as a channel complex system consisting of three-phase channel complex sets. Due to the later erosion of the early formed channel deposits by the late channels, there are three overlapping styles in the study area: the vertical overlapping, the lateral overlapping and the composite overlapping.