海洋地质与第四纪地质2012，Vol.32Issue(5)：1-11,11.DOI:10.3724/SP.J.1140.2012.05001
南沙海域万安盆地地质构造与沉积体系特征
GEOLOGICAL STRUCTURE AND SEDIMENTARY SYSTEMS OF THE WAN'AN BASIN, NANSHA WATERS
摘要
Abstract
The Wan'an Basin is a strike-slip and pull-apart basin formed by the tensile stress derived from the dextral strike-slip movement of the Wan'an fault on its east side. Main faults extend in NE、NEE and SN directions that formed a tectonic pattern of "three swells-four depressions"in the basin. The basin experienced a successive tectonic evolution of basement formation, initial rifting, rifting development (first phase of rifting), early postrifting ( second phase of rifting)、 tectonic inversion and postrifting (regional subsidence). Based on the relationship of two-way travel time vs. Depth between stacking velocities from the seismic data and drilling data from wells,four megasequence boundaries were identified: MBl,the top of the acoustic Pre-Tertiary basement; MB2, the top of the Oligocene (24Ma) ; MB3, the Late Miocene (8Ma) ;MB4, the Early Pliocene (4Ma). Above each megasequence boundary ( MB) , there is a megase-quence(MS). They are referred to as MSI to MS4 from the oldest to youngest, corresponding to a lacustrine-deltaic depositional system of Late Eocene-Oligocene; a transitional system of non-marine-littoral-shelf in Late Miocene;a system of carbonate-shallow water shelf and deltaic system of Miocene-Early Pliocene and a shelf-slope-deep marine system of Early Pliocene-Quaternary, respectively.关键词
构造/层序/沉积/万安盆地Key words
tectonic/sequences/sedimentation/ Wan'an Basin分类
海洋科学引用本文复制引用
吴峧岐,高红芳,孙桂华..南沙海域万安盆地地质构造与沉积体系特征[J].海洋地质与第四纪地质,2012,32(5):1-11,11.基金项目
国家专项"东南亚地区油气资源地质综合研究与区域优选"(GT-YQ-QQ-1-02-05) （GT-YQ-QQ-1-02-05）
