Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 653-661.doi: 10.13278/j.cnki.jjuese.20190264

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Control Factors of High Quality Reservoir in Upper Part of the 3rd Member of Eocene Shahejie Formation in Kenli L Oilfield, Bohai Bay Basin

Zhao Hanqing, Chen Xiaoming, Li Chao, Wu Qiongyuan, Wang Di   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2019-12-09 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by National Science and Technology Major Project (40972076) and Major Science and Technology Project of CNOOC Ltd. (YXKY-2018-TJ-04)

Abstract: The physical characteristics and genesis of the upper part of the 3rd member of Eocene Shahejie Formation (E2s3u) in Kenli L oilfield of Laizhou Bay sag in Bohai Bay basin were clarified by using a variety of analyses and testing methods, such as casting thin sections, SEM, X diffraction, pore permeability test and drilling test, combined with the related research results of regional tectonic setting and sedimentary system, the physical properties control factors of E2s3u were discussed, and applied in oilfield water injection development. The results show that:the reservoir of E2s3u with the average porosity of 28.9% and the average permeability of 762.7×10-3μm2 belongs to "high porosity-permeability" reservoir,the reservoir space is mainly primary intergranular pores with secondary intergranular pores, mold holes, and micro-fractures; the average width of the micro-fractures is 180 μm, the existence of the micro-fractures provided a highly efficient seepage channels, which makes drilling test pore permeability is obviously better than that through core test. The physical properties of high quality reservoirs are mainly affected by system tract, fault activity and burial, the thick net sandstone under transgressive system tract is the material basis of forming high-quality reservoirs; the developed micro-fractures improved seepage capacity; rapid burial slowed the drainage of reservoir pore water and the decline of reservoir physical properties. Based on high-quality reservoir development characteristics and production dynamic data, optimizing layered allocation of water wells, reducing uneven water flooding in the horizontal and vertical directions, and then Kenli L oilfield achieved balanced displacement.

Key words: high quality reservoir, micro-fracture, control factors, E2s3u, Kenli L oilfield

CLC Number: 

  • TE122.2
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