Distributing pattern and mapping method of delta and beach￣bar composite sand-bodies in continental lacustrine basin
Ji Youliang1, 2, Liu Junlong1, 2, Wang Tianyun1, 2, Liu Dawei1, 2, Cheng Tongran1, 2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249;
Abstract The continental lacustrine basin, which is different from marine environment, has the characteristics of shallow￣water, low￣energy, frequent progression and regression, etc. Based on key technologies of high-resolution sequence stratigraphy and seismic sedimentology, combined with the exploration practice, analysis of outcrops and investigation of modern sediments of the typical continental lacustrine basins in eastern and central￣western regions of China, we summarized the distribution pattern of delta and beach￣bar composite sand￣bodies in the continental lacustrine basin and proposed the geological mapping method of composite sand-bodies. The results show that: (1) The “lacustrine￣continental transitional sedimentary system” in continental lacustrine basins, not only has tributary channels, but also has channel mouth bars and longshore bars, sediments of tributary channels, channel￣mouth bars and longshore bars in different geological times were superimposed and preserved in ancient strata and modern sediments; (2) In the condition of flat￣terrain, shallow￣water and low￣energy wave regime, the fluvial process is predominated and channel sand￣bodies were formed; in the condition of steep￣terrain and high￣energy wave regime, the sand￣bodies of tributary channel were reformed and the beach￣bar sand￣bodies along the lake shore were formed; (3) In the background of high frequent lake level changes, the migration of sedimentary slop￣break was dominated by the migration of shoreline, and the special structure of composite delta and beach￣bar sand￣bodies, which were superposed by the multi￣period dendritic distributary channel sand￣bodies perpendicular to the coast, and the multi￣period banding beach￣bar sand￣bodies along the shore in continental lacustrine basin, was formed; (4) Based on the distribution pattern of composite sand-bodies, the geological mapping method of composite sand￣bodies is derived from traditional single factor method, and it mainly focused on the delta and beach￣bar sand￣bodies that developed in continental lacustrine basins with shallow water and low slope.
Corresponding Authors:
Liu Junlong,born in 1988,is a Ph.D. candidate of China University of Petroleum(Beijing). He is mainly engaged in sedimentology and sequence stratigraphy. E-mail: jl_liu2007@sina.cn.
About author: Ji Youliang,born in 1962,is a professor of China University of Petroleum(Beijing). He is mainly engaged in petroleum geology,sedimentology and sequence stratigraphy. E-mail: jiyouliang@cup.edu.cn.About the corresponding author Liu Junlong,born in 1988,is a Ph.D. candidate of China University of Petroleum(Beijing). He is mainly engaged in sedimentology and sequence stratigraphy. E-mail: jl_liu2007@sina.cn.
Cite this article:
Ji Youliang,Liu Junlong,Wang Tianyun et al. Distributing pattern and mapping method of delta and beach￣bar composite sand-bodies in continental lacustrine basin[J]. JOPC, 2016, 18(4): 615-630.
Ji Youliang,Liu Junlong,Wang Tianyun et al. Distributing pattern and mapping method of delta and beach￣bar composite sand-bodies in continental lacustrine basin[J]. JOPC, 2016, 18(4): 615-630.
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