Quantitative Research of Fluvial-dominated Delta Front Sedimentary System: A case study of Poyang Lake delta
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摘要: 通过现代三角洲沉积的卫星照片可以获取并分析水下分流河道与河口坝的定量数据及其平面分布规律，丰富与完善储层地质知识库。以鄱阳湖三角洲为主要为研究对象，结合Wax Lake Delta现代沉积的卫星照片，对典型的朵状河控三角洲前缘水下分流河道与河口坝的平面分布特征及其相互关系进行定性及定量研究。结果表明水下分流河道的分叉角度近50 °，向湖盆方向宽度变窄（宽度降低0.72倍）、数量变多，呈发散叶脉状；单一的河口坝呈三角状和狭长心滩状，其中三角状河口坝发育在三角洲前缘下部，狭长心滩状河口坝位于三角洲前缘中上部，并且河口坝长度与宽度之间存在较好的线性关系。研究结果可以有效指导相似地下储层的精细微相研究。Abstract: Through the satellite images analysis of modern delta sedimentary , we could obtain the planar distributions as well as the quantitative rules of the subaqueous distributary channels and river mouth bars, which enrichs and perfects the reservoir geological repository. By combining the modern sedimentary satellite images of Wax Lake Delta and taking Poyang Lake Delta as a research object, this article qualitatively and quantitatively analyses the plane distribution features and relations of subaqueous distributary channels and mouth bars in typical lobate fluvial-dominated delta front has been described.Research results show that the bifurcation angle of subaqueous distributary channel is nearly 50 °, of which the width is narrower towards lake basin (0.72 times reduction in width), the quantity is more and the shape presents like divergent leaf. The single river mouth bar present triangular shape and narrow mid-channel-bar-like, of which the triangle shaped one is developed at the lower part of the delta front, while the narrow mid-channel-bar-like one is located in the upper part, and there is a fair good linear relationship for the length and width of mouth bar. These results could effectively guide the research on fine microfacies distribution of similar underground reservoir.
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Key words:
- delta front /
- distributary channel /
- mouth bar /
- Poyang Lake delta
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