Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 67-75.doi: 10.12108/yxyqc.20180608

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Influences of gypsum-salt deposition on gas accumulation of the fifth member of Majiagou Formation in Ordos Basin

SUN Yujing1,2, ZHOU Lifa1,2   

  1. 1. Department of Geology, Northwest University, Xi'an 710069, China;
    2. State Key Laboratory of Continental Dynamics, Xi'an 710069, China
  • Received:2018-04-10 Revised:2018-07-09 Online:2018-11-16 Published:2018-11-16

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Abstract: The fifth member of Majiagou Formation (Ma 5 member)is the main gas exploration layer of Ordovician in Ordos Basin. Studying the influences of gypsum-salt deposition on gas accumulation is helpful to the further exploration and development of gas field. The data of cores, thin sections and other statistical analysis were used to study the lithology characteristics and genesis of gypsum-salt rocks of Ma 5 member, as well as its influences on gas reservoir. The results show that the gypsum-salt rocks in Ma 5 member mainly consist of gypsum and gypsum karst breccia, which belong to evaporative genesis. The deposition of gypsum-salt rocks in Ma 5 member is conducive to the organic matter preservation and hydrocarbon generation, and to maintaining and improving the porosity of the lower strata. It also has good sealing ability, and is beneficial for the migration, accumulation and preservation of gas. It is believed that the gypsum-salt deposition in Ma 5 member plays a significant role in the formation of gas reservoirs. This research result is of great importance for the study on the influences of gypsum-salt deposition on natural gas accumulation in similar areas.

Key words: gypsum-salt rock, evaporative genesis, gas reservoir, the fifth member of Majiagou Formation, Ordovician, Ordos Basin

CLC Number: 

  • TE122.1
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