深水斜坡沉积特征与控制因素OA北大核心CSTPCD

Understanding deep-water slope depositiona is of great significance for deep-water oil and gas explora-tion and development as well as deep-water geohazard protection.To reveal the characteristics and controlling factors of the Neogene deep-water slope deposition in the Roebuck Basin,Australia,the stratigraphic sequences of slope deposition were delineated by using high-resolution 2D seismic data,and seven third-level sequence inter-faces and six seismic sequences were recognized on seismic section.Results show that the Neogene in the study area are mainly the sedimentary sequences of progradational,aggradational-progradational,and retrogradational sedimentary sequences.The deep-water area of the Roebuck Basin developed three types of slope deposits:pro-gradational carbonate rock deposits,siliceous debris deltaic deposits,and olistostrome deposits.The deep-water slope deposits were controlled by various factors.In the Middle Oligocene and the Late Miocene,the slope depos-its were controlled by the relative sea level fluctuation,paleoclimate,and material supply,while after the Late Miocene,with the collision of the northward drifting Australian plate against the Banda Island Arc,the deep-wa-ter slope deposition was mainly controlled by tectonic activities.