Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 19-26.doi: 10.12108/yxyqc.20200103

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Development characteristics and genetic mechanism of mid-deep reservoirs in Ledong area,Yinggehai Basin

LI Wei, LIU Ping, AI Nengping, SHAO Yuan, HOU Jingxian   

  1. Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, Guangdong, China
  • Received:2019-07-08 Revised:2019-10-07 Online:2020-01-21 Published:2019-11-22

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Abstract: In order to research the development characteristics and genetic mechanism of mid-deep reservoirs in Ledong area of Yinggehai Basin,analysis of casting thin section,scanning electron microscope observation, physical properties test and mercury injection experiment were carried out. Combined with logging,well testing data,regional burial history,hydrocarbon charging time and overpressure genesis,a detailed study was carried out on the origin of low permeability and development mechanism of "sweet spots". The results show that:(1)The mid-deep reservoir sandstone in Ledong area is mainly feldspar debris sandstone with low maturity. The secondary dissolved pore is developed,and the pore texture of sandstone is dominated by large-medium pore and fine throat. The reservoir properties are mainly of low porosity and low permeability,ultra-low porosity and ultra-low permeability.(2)The mid-deep reservoirs have experienced strong compaction,and the high content of plastic minerals leads to weak compaction resistance. Not only that,the content of cement is high,and the overpressure formed in late stage has limited protective effect on the reservoirs,which results in the low permeability of the reservoirs.(3)The development of sweet spot reservoir is mainly due to a large number of secondary dissolved pores produced by dissolution,and the dissolution fluid is mainly organic acid carried by hydrocarbon charging. The structural action and temperature-pressure environment play a constructive role in improving reservoir physical properties. The research results can be used for reference in searching for secondary pore development zones in the mid-deep formation of Yinggehai Basin.

Key words: high-temperature and overpressure, low permeability reservoirs, digenesis evolution, mid-deep formation, Ledong area, Yinggehai Basin

CLC Number: 

  • TE122.2
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