Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (3): 652-664.doi: 10.13278/j.cnki.jjuese.20160368

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Formation Mechanism and Distribution of High-Quality Reservoirs for Beach-Bar Sandstones in Upper Part of Es4 in Boxing Sag, Dongying Depression

Jia Yancong1, Cao Yingchang2, Lin Changsong3, Wang Jian2   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    3. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
  • Received:2017-10-07 Online:2018-05-26 Published:2018-05-26
  • Supported by:
    Supported by National Oil & Gas Major Project of China (2016ZX05006-007) and Fundamental Research Funds for Central Universities (CUG170630)

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Abstract: Based on the core observation, thin section identification, scanning electronic imaging, and petro-physical property and other technical methods, the basic reservoir characteristics of medium-deep strata of beach-bar sandstones were investigated in the upper part of Es4 (Es4s) in the Boxing sag, Dongying depression. The results indicate that the reservoirs are mainly characterized by low porosity and low permeability, and the reservoir spaces are mainly of primary and secondary pores. The formation mechanism of high-quality reservoirs is mainly consist of sedimentation, stratigraphic overpressure, hydrocarbon injection, acid dissolution,and chlorite grain coating. The reservoirs of both bar body and beach edge sub-facies that are far from mudstones are well sorted with strong anti-compacting capacity. Abundant primary and secondary porosities are developed in the medium-deep strata because of the modifications caused by acid dissolution and hydrocarbon filling. These reservoirs are protected by both stratigraphic overpressure and chlorite grain coating, and therefore become effective high-quality reservoirs. The lithofacies of both bar bodies and beach edge sub-facies adjacent to mudstones are typically characterized by the extensive carbonate cementation, which results in the extremely physical properties and invalid reservoir quality. The lithofacies of both bar edge and beach mat sub-facies were deposited under the poor depositional conditions with high contents of matrix. The reservoirs were dominated by compaction and micritic carbonate cementation with weak acidic dissolution. The present physical properties are extremely poor and characterized by invalid reservoirs from shallow to deep strata. The high-quality reservoirs of beach-bar sandstones are located at the central section of thick bar bodies and beach edges.

Key words: high-quality reservoir, formation mechanism, beach-bar, Dongying depression, Boxing sag

CLC Number: 

  • P618.13
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