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Petroleum Science >2012,??Issue 1:??1-9 DOI: https://doi.org/10.1007/s12182-012-0175-z

The early-middle Miocene submarine fansystem in the Pearl River Mouth Basin, SouthChina Sea Open?Access

文章信息

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作者：Wang Yongfeng,Wang Yingmin,Xu Qiang,Li Dong,Zhuo Haiteng and Zhou Wei
作者單位：

College of Geosciences, China University of Petroleum, Beijing 102249, China; State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;College of Geosciences, China University of Petroleum, Beijing 102249, China; State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;CNOOC Research Institute, Beijing 100027, China;College of Geosciences, China University of Petroleum, Beijing 102249, China; State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;College of Geosciences, China University of Petroleum, Beijing 102249, China; State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;College of Geosciences, China University of Petroleum, Beijing 102249, China; State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China

投稿時(shí)間：2011-07-28
引用方式：Wang, Y., Wang, Y., Xu, Q. et al. Pet. Sci. (2012) 9: 1. https://doi.org/10.1007/s12182-012-0175-z

文章摘要

Based on a large amount of seismic, drilling and core data, the characteristics of the earlymiddle Miocene submarine fans in the Baiyun Sag, northern South China Sea are investigated. By analyzing the sedimentary processes of submarine fans in SQ21 (SQ21 refers to the 3rd-order sequence with its bottom boundary 21 Ma), a sedimentary model of the sand-rich fans is established and the main factors controlling fan deposition are detailed. The results indicate that from early to middle Miocene the Pearl River Mouth Basin developed seven 3rd-order sequences in all, with each lowstand systems tract
(LST) of the sequence corresponding to submarine fans. However, only the fans in SQ13.8 and SQ21 are sand-rich fans, the others being mud-rich fans. The cores reveal that the submarine fans in the Pearl River Mouth Basin developed five lithofacies: (1) mud clast-bearing sandstone, interpreted as channel
deposits; (2) typical turbidite sandstones, also interpreted as channel deposits; (3) thin-bedded sandstone and mudstone, interpreted as channel-levee complex deposits; (4) massive sandstones, interpreted as lobe deposits; (5) massive mudstone, interpreted as hemipelagic mud. The sand-rich submarine fans in the Pearl River Mouth Basin mainly developed in LST, and in LST reverse faults were active, which led to the formation of accommodation on the shelf. Different from the theory of classic sequence stratigraphy, the accommodation on the shelf captures terrigenous debris transported by the Pearl River, and the uplift at the edge of shelf serves as a “Linear Source” for the deep water area instead of the Pearl River. Therefore, the fans mainly derived from the eroded debris from the uplift. Factors controlling fan deposition include the basin’s tectonic framework, the evolution of the slope break, relative sea-level changes as well as the evolution of the fault system, and the fans are formed under the combination of the above factors.

關(guān)鍵詞

    Submarine fan, lithofacies, reverse fault, sedimentary process, controlling factor