Migration patterns and controlling factors of barrier of the Benxi Formation in southeastern Ordos Basin
PENG Zixiao1, YU Xinghe1, LI Shunli1, QI Rong2, FU Chao3, JIANG Longyan2
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 North China Oil and Gas Branch,SINOPEC,Zhengzhou 450006,China; 3 CNOOC Research Institute Co., Ltd.,Beijing 100028,China
Abstract The Upper Paleozoic Benxi Formation in the Ordos Basin experienced multiple transgressions and developed extensive epicontinental sea deposits. The distribution characteristics and control factors of the clastic barrier system in the southeastern of the basin are still not clear. Based on the field core,electric logging, and other data,this paper studied and established the sedimentary sequence of barrier system,restored the macro palaeogeomorphic features,depicted the plane distribution of barrier sand body,and clarify the migration style and control factors of the barrier system in Benxi Formation. Four types of sedimentary sequences,barrier island,tidal channel delta,tidal flat lagoon and swamp,were identified in the barrier coastal sedimentary system; moreover, two types of palaeogeomorphic features,namely,the stepped steep slope at the bottom of the Member 1 of Benxi Formation and the continuous gentle slope at the bottom of the Member 2 of Benxi Formation,were characterized. The barrier is distributed along the multi-stage parallel shoreline. the sand body continuity along the shoreline is high,and the vertical shoreline presents multi-stage migration characteristics. The barrier system shows two types of migration modes in map view. The Member 1 of Benxi Formation is dominated by rolling continuous migration,with low vertical overlap and strong horizontal continuity. The Member 2 of Benxi Formation is dominated by jump interval migration,with high overlap and weak horizontal continuity. The transgression process promoted the preservation of barrier system,but its distribution and migration were mainly controlled by palaeogeomorphology. The coastline trajectory controlled the distribution direction of the dominant long axis of barrier,and the steep and gentle slopes caused the differences in migration patterns of barriers. This study also emphasizes the importance of sea level rise and palaeogeomorphic slope in establishing the evolution model of ancient barrier systems.
Fund:National Natural Science Foundation of China(No.421721112)and Fundamental Research Funds for the Central Universities,China(No.2-9-2019-100)
Corresponding Authors:
YU Xinghe,born in 1958,is a professor and director of the Ph.D. candidate. He is mainly engaged in reservoir sedimentology and analysis of petroliferous basins,hydrocarbon reservoir characterization and modeling technology,analysis of marine hydrocarbon accumulation conditions,and resources evaluation. E-mail: billyu@cugb.edu.cn.
About author: PENG Zixiao,born in 1995,is a Ph.D. candidate in China University of Geosciences(Beijing). He is currently engaged in applied sedimentology research. E-mail: zixiao1995@gmail.com.
Cite this article:
PENG Zixiao,YU Xinghe,LI Shunli et al. Migration patterns and controlling factors of barrier of the Benxi Formation in southeastern Ordos Basin[J]. JOPC, 2023, 25(6): 1330-1346.
PENG Zixiao,YU Xinghe,LI Shunli et al. Migration patterns and controlling factors of barrier of the Benxi Formation in southeastern Ordos Basin[J]. JOPC, 2023, 25(6): 1330-1346.
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