中南大学学报（自然科学版）Issue(2)：531-540,10.DOI:10.11817/j.issn.1672-7207.2016.02.025
强制海退体系域的识别特征与成因分析
Recognition criteria and genesis of falling stage systems tract
摘要
Abstract
Based on the seismic reflection termination, shoreline trajectory behavior, drilling and logging data, and the horizon slice with the root-mean-square amplitude extraction, the identification, evolution and genesis of the falling stage system tract (FSST) in the Pearl River Mouth Basin near 13.8 Ma were discussed. The results show that the seismic reflection characteristics of the FSST present high angle progradation in dip orientation. The shoreline trajectory shows descending or horizontal trend and the incised valleys are often observed along the strike orientation. In addition, the log curve of the FSST takes funnel shape. Especially, the GR curve of well W1 presents four reverse cycles obviously, corresponding to four sessions of parasequence sets. Each parasequence set shows upward shallowing succession and its top suddenly changes into deep water facies controlled by the fourth-order base-level fluctuation, respectively. Sedimentary distribution characteristics of the FSST near 13.8 Ma are different along the strike orientation in the northern Baiyun Sag. In the western area, the seismic attribute shows higher amplitude and “lobate” shape, which reflects the development of main river channels with thick sand body. However, due to the strong affection of the NE oriented alongshore current, the amplitude extraction of horizontal slices show stripped shape in the eastern area. The paleo Pearl River delta near 13.8 Ma is a wave-influenced and asymmetric delta. Reservoir property in the western deep-water area is better than that in the eastern area. Resulting from the cold ancient climate, the falling of sea level is the main reason of the development of the FSST near 13.8 Ma. The plan distribution pattern of the FSST is a comprehensive result of the provenance supply capacity, estuary development location, shelf width, slope gradient, coastal current and tidal action.关键词
珠江口盆地/白云凹陷/层序地层学/强制海退体系域Key words
Pearl River Mouth Basin/Baiyun sag/sequence stratigraphy/falling stage systems tract分类
能源科技引用本文复制引用
徐少华,王英民,何敏,杜家元,陈维涛,秦春雨,王利良..强制海退体系域的识别特征与成因分析[J].中南大学学报（自然科学版）,2016,(2):531-540,10.基金项目
国家自然科学基金资助项目(41372115)；国家重点基础研究发展规划(973计划)项目(2009CB219407)(Project (41372115) supported by the National Natural Science Foundation of China （41372115）
Project (2009CB219407) supported by the National Basic Research Development Program (973 Program) of China) （2009CB219407）
