Developmental pattern and genetic background of carbonate platform margin reef complexes in deep-water area in Western South China Sea
Wang Chao1,2,3, Lu Yongchao2,3, Du Xuebin2,3, Chen Ping2,3, Chen Lei2,3, Jiao Xiangyan2,3
1. Jianghan Oilfield Branch Co., SINOPEC, Qianjiang, Hubei 433124, China;
2. Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China;
3. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
Abstract：Cenozoic reef-banks reservoirs in western deep-water area of the South China Sea are one of the most profitable targets. In this work, developmental pattern and genetic background of carbonate platform margin reef complexes are analyzed based on the latest 2D and 3D seismic data. It is found that there are two kinds of developmental pattern of reef complexes in the area:fault-controlling steep slope and carbonate platform ramp with three kinds of interior depositional structures:aggradational, progradational, and retrogradational structures. Geology and environment background play an important role in the growth characteristic and distribution of reef complexes. Palaeogeo morphology and tectonic subsidence rate are the main controlling factors in the development of fault-control steep slope reef complexes. The spatial distribution of marginal reef is influenced by the former factor while the interior sedimentary structure is controlled by the latter one. Sea level changes and monsoon-ocean currents are the crucial factors in the development of carbonate platform ramp. The sea level changes play a vital role in reef complex migration and vertical stacking pattern. Monsoon and ocean currents influence not only the scale of reef development and its external morphology, but also control the distribution of sedimentary facies.
王超, 陆永潮, 杜学斌, 陈平, 陈雷, 焦祥燕. 南海西部深水区台缘生物礁发育模式与成因背景[J]. 石油地球物理勘探, 2015, 50(6): 1179-1189.
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