Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 24-33.doi: 10.12108/yxyqc.20220103

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Simulation experiment of argillaceous sedimentary law of delta-shallow sea sedimentary system: A case study of Yanan Sag, Qiongdongnan Basin

QU Tong1,2, GAO Gang1,2, XU Xinde3, WANG Rui1,2, GAN Jun3, LIANG Gang3, YOU Junjun3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, Guangdong, China
  • Received:2021-06-25 Revised:2021-09-18 Published:2022-01-21

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Abstract: The delta-shallow sea sedimentary system has attracted the attention of many scholars due to its combination of terrestrial organic matter and marine organic matter. In recent years,oil and gas exploration practices in the South China Sea have shown that terrigenous marine mudstone of Yacheng Formation is one of the important sources of oil and gas generation. The source rocks are buried deep and there are few existing wells,which greatly limits the research and exploration progress of source rocks in this area. In order to study the deposition and distribution of argillaceous sediments,based on the geological background of Yacheng Formation in Yannan Sag, Qiongdongnan Basin,a sedimentary simulation experiment was designed to observe the sedimentary process,and the sedimentary bodies were sampled to determine the particle size composition of the samples. Combined with qualitative observation and quantitative comparison,the sedimentary law of argillaceous sediments in delta shallow sea sedimentary system was explored,and the dominant development position of terrestrial marine source rocks was revealed. The results show that from the provenance to the shallow sea,the argillaceous content of sediments increases as a whole. At the delta front slope,the argillaceous content increases suddenly due to the sudden drop of hydrodynamic conditions,but the total amount of the sediments increases first and then decreases,which makes the total amount of the argillaceous sediments decrease to the deep water. The delta front slope-shallow sea sedimentary area is the dominant area for the development of terrestrial marine source rocks,and argillaceous sediments can also be developed in the low-lying and weak hydrodynamic parts of the delta sedimentary body. The increase of terrain slope is conducive to the transportation of argillaceous sediments to the deep-water area. The delta frontshallow sea area is the main part of argillaceous sediment accumulation,that is,the nearshore area near the sea basin,which provides an important basis and guidance for the prediction of the dominant development parts of continental marine source rocks in the deep-water area of Qiongdongnan Basin.

Key words: delta-shallow sea sedimentary system, terrestrial marine source rock, argillaceous sediment, sedi mentary simulation experiment, dominant development area, Qiongdongnan Basin

CLC Number: 

  • TE122.2
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