Quantitative  Research of Fluvial-dominated Delta Front Sedimentary System: A case study of Poyang Lake delta

Key words: 
• delta front /
• distributary channel /
• mouth bar /
• Poyang Lake delta

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.