Presenter: Kang-Nien Shen
Date: 2015/10/08
Abstract
The studies of the relationship between submarine canyons and deep-water system are always important subjects. This study tries to understand the control factors of stratigraphic frameworks and sedimentary processes by using 2D/3D seismic profiles, well log and core data. The information of geological age of sequence boundaries identified by using well log and core data can be used to compare with the seismic interpretations. The results show continuous processes that rework sediments transfer from shallow to deep-water environment. Three sedimentary processes, which are included re-sedimentation processes, normal bottom currents and pelagic settling, may be suitable for interpreting the seismic facies that observed from seismic data. The standard sedimentary facies models can also be constructed based on various sedimentary processes, and it can also reveal lateral and vertical distribution of sedimentary facies in each of the major deep-sea settings. And the canyon is a path for sediments transferred from shallow to deep-water environment. Erosional and sedimentary processes play important roles on canyon evolution. This study used sedimentary models to interpret seismic facies identified from seismic profiles, and try to speculate sedimentary processes and environment. For example, the Central submarine canyon evolution in the Quingdongnan basin with four stages of cut-and-fill feature, including eroded of axial, both axial and side cut-and-fill, side cut-and-fill, and filled. Therefore, we may understand the canyon evolution of each cut-and-fill stages by sedimentary processes and seismic facies.
Reference