Sedimentary models and case study of sand-rich shallow-water delta in continental lacustrine basins with low accommodation
ZHU Xiaomin1, YE Lei1, XIE Shuanghui1, YANG Ke1, QIN Yi2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China
Abstract The sand-rich shallow delta in continental lacustrine basins with low accommodation is not only the research hotpoint in sedimentology,but also the attractive object in petroleum exploration. By tracking the research of shallow-water delta in low accommodation basins by domestic and foreign scholars,combined with the example of the Paleogene shallow-water delta in Wen'an slope of Baxian sag,the development conditions,sedimentary characteristics,sedimentary mechanism, and sedimentary models of shallow water delta in low accommodation basins are summarized. The development of a large shallow-water delta sedimentary system in low accommodation is controlled by relatively stable tectonic activities,gentle slopes(often less than 1°),periodic climates,open-flow lake basins,frequent fluctuations of the shallow-water environment,and high-speed and high-flux abundant sources. In the low accommodation,the shallow-water delta forms the oxidation color and the reduction color mudstones,which have strong biological disturbances,and sedimentary structures of strong hydrodynamic traction. The strong scouring action forms two kinds of intermittent positive rhythms of‘mud’ and‘mudless’. The river channel continues to extend to the center of the basin,forming deltas of dendritic,bandlike, and bird-foot shapes. The case study shows that the first Member of Shahejie Formation in Wen'an slope of Baxian sag is a low accommodation basin,and a large area of shallow-water delta is developed under the background of sufficient sediment supply. When the shallow-water delta is formed,the ratio of accomodation space and sediment supply(A/S) of the delta plain is the smallest, and the channel is mainly vertically-aggradated,so that the channel is stable and the bifurcation is rarely occurred. In the vertical direction,it is characterized by positive rhythms of‘mudless’,which is characterized by‘branch’ in the plane. In the inner front, the A/S is relatively increased, and the lateral migration of the channel is enhanced,causing the channel being bifurcated. In the vertical direction,positive rhythms of‘mud’ and‘mudless’ coexist,which is characterized by‘mesh’ in the plane. In the outer front, the A/S reaches the maximum; due to the dominance of lake waves,the subaqueous distributary channel is obviously sheeted,which is characterized by isolated sand body vertically and isolated channel or large area sheet sand on the plane.
Fund:National Natural Science Foundation of China(No.42272110)
About author: ZHU Xiaomin,born in 1960,is a professor of College of Geosciences,China University of Petroleum(Beijing). He is mainly engaged in researches on sedimentology and sequence stratigraphy.E-mail: xmzhu@cup.edu.cn.
Cite this article:
ZHU Xiaomin,YE Lei,XIE Shuanghui et al. Sedimentary models and case study of sand-rich shallow-water delta in continental lacustrine basins with low accommodation[J]. JOPC, 2023, 25(5): 959-975.
ZHU Xiaomin,YE Lei,XIE Shuanghui et al. Sedimentary models and case study of sand-rich shallow-water delta in continental lacustrine basins with low accommodation[J]. JOPC, 2023, 25(5): 959-975.
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