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Tectonic characteristics and structural styles of a continental rifted basin:Revelation from deep seismic reflection profiles

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Geodesy and Geodynamics 2016年第5期7卷 329-339页

作者： Yuan Li Yannan Zhao Zhengliang Lin Qinlin Ma Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan 430071China Wuhan Institute of Earthquake Engineering Co. LtdWuhan 430071China Sinopec Geophysical Research Institute Nanjing 210014China Exploration and development Corporation PetroChinaGuangzhou 510000China

The Fushan depression is a half-graben rifted sub-basin located in the southeast of the Beibuwan Basin, South China Sea. The Paleogene Liushagang sequence is the main hydrocarbon-bearing stratigraphic unit in the sub-basin. Using three-dimensional（3-d）seismic data and logging data over the sub-basin, we analyzed structural styles and sedimentary characteristics of the Liushagang sequence. Five types of structural styles were defined： ancient horst, traditional slope, flexure slope-break, faulted slope-break and multiple-stage faults slope, and interpretations for positions, background and development formations of each structural style were discussed. Structural framework across the sub-basin reveals that the most remarkable tectonic setting is represented by the central transfer zone（CTZ） which divides the sub-basin into two independent depressions, and two kinds of sequence architectures are summarized：（i） the western multi-stage faults slope;（ii） the eastern flexure slope break belt. Combined with regional stress field of the Fushan depression, we got plane combinations of the faults, and finally built up plan distribution maps of structural system for main sequence. Also, we discussed the controlling factors mainly focused on subsidence history and background tectonic activities such as volcanic activity and earthquakes. The analysis of structural styles and tectonic evolution provides strong theoretical support for future prospecting in the Fushan subbasin and other similar rifted basins of the Beibuwan Basin in South China Sea.

关键词： South China Sea Continental rifted basin Structural style 3-d seismic-reflection seismic geomorphology

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