THE INTERNAL ARCHITECTURE OF DEEPWATER CHANNELS IN BAIYUN SAG,PEARL RIVER MOUTH BASIN
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摘要: 在珠江口盆地白云凹陷中发育有深水水道,以水道复合体为主,单一水道较少。在水道复合体的水道单体中识别出侵蚀基底、底部滞留沉积、滑塌体和内侧天然堤等内部结构要素。复合水道间的内部样式分为叠加型和切割型两种,叠加型反映多期水道的垂向加积,切割型反映多个水道相互侵蚀切割。水道内部以侧积、加积、侧积和加积3种方式进行充填。水道的演化过程经历了最初的侵蚀和随后的3个充填阶段。不同的水道内部结构样式对应于不同的充填阶段。底部滞留和滑塌体为充填阶段1的产物;内侧天然堤主要是在充填阶段2形成;在充填阶段3中复合水道发育,内部充填以加积方式为主,侧积也常见。水道内部建筑结构的精细分析有助于推动对水道的整体研究,对于认识水道储层的建筑结构也有重要意义。Abstract: Complex deepwater channels are well developed in the Baiyun Sag,Pearl River Mouth Basin. There are erosional base, basal lags, slump and inner levees in an individual channel. The channel complees, however, are rather complicated and may be divided into the superposition type and the incision type. The former reflects the aggradation of multi-phase channels and the latter the mutual incision of several channels. The internal channel fill are mainly in forms of lateral accretion, aggradation and the combination of lateral accretion and aggradation. The channel evolution is usually started from incision followed by a three-phase fill history. Different internal architecture of a channel corresponds to different fill phases. Basal lags and slumps are the product of the fill phase 1, whereas the inner levees are formed in the fill phase 2. In the fill phase 3, channel complexes are developed, the internal channel fill is mainly the product of aggradation, and the lateral accretion is also common. The precise analysis of the internal architecture is helpful not only to the research of the channel itself, but also to the study of reservoir architectures.
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Key words:
- the Baiyun Sag /
- deepwater channel /
- architecture element /
- fill phase
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