Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 50-57.doi: 10.12108/yxyqc.20180206

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Sedimentary characteristics and controlling factors of beach-bar sandbodies of the second member of Shahejie Formation in Chezhen Sag

SHI Ruikun1, GAO Qiuju1, HAN Xiaofeng2, BA Suyu1, SHI Tao1, HAN Min3   

  1. 1. Geophysical Research Institute, Shengli Oilfield Company, Sinopec, Dongying 257022, Shandong, China;
    2. Xi'an center of Geological Survey, CGS, Xi'an 710054, China;
    3. Research Institute of Petroleum Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257000, Shandong, China
  • Received:2017-11-03 Revised:2018-01-15 Online:2018-03-21 Published:2018-03-21

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Abstract: A certain scale of beach-bar sandbodies were developed during the sedimentary stage of the second member of Shahejie Formation in Chezhen Sag. The understanding of the law of sedimentation and migration of beach-bar sandbodies is not yet deep enough, which restricts the process of fine exploration and development of beach-bar sandbody reservoirs. In order to further clarify the law of sedimentation and migration of beach-bar sandbodies, the sedimentary characteristics and controlling factors of the beach-bar sandbodies were studied by integrating the data of core, drilling, logging and relevant test data. The results show that the beach-bar sandbodies were dominated by debris-feldspar sandstones, the grain size probability curves mainly include patterns of "1 skip + 1 suspension" and "2 skip + 1 suspension" representing wave deposition. Several types of sedimentary structures were developed in beach-bar sandbodies, mainly including wave-ripple cross-bedding and ripple crossbedding with wave influence, horizontal bedding reflecting strong hydrodynamic force, burrow pores and bioturbation structures indicating biological effect. The beach-bar sandbodies were reconstructed in-situ, which mainly developed bar facies with obvious inverted sequence, beach facies with indistinct inverted sequence and beachbar facies with positive sequence and composite sequence vertically due to the role of wave transforming incompletely in partial area. The fault activities controlled the deposits and migrations of the beach-bar sandbodies, wave actions controlled the development of the in-situ reconstructed beach-bar sandbodies, and the supplies of material sources controled the development scales of the beach bar sandbodies. The beach-bar sandbodies were entirely distributed in overall basin with characteristics of over-lake deposition with meidium-low compositional and structural maturity during the sedimentation of the second member of Shahejie Formation in Chezhen Sag. The results can provide a reference for the further exploration and development of beach-bar sandbody reservoirs of the second member of Shahejie Formation in Chezhen Sag.

CLC Number: 

  • TE121.3
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