Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 33-42.doi: 10.12108/yxyqc.20200204

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Characteristics and controlling factors of Lower Paleozoic reservoir in Sulige Gas Field

TIAN Qinghua1, LIU Jun2, ZHANG Chen1, WANG Wensheng1, HUANG Dan1   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. No.4 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710021, China
  • Received:2019-08-22 Revised:2019-11-02 Online:2020-03-21 Published:2020-01-19

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Abstract: The reservoir of Lower Paleozoic Majiagou Formation in Sulige Gas Field has become a strong support for stable production of the gas field. It is of great significance to analyze the reservoir characteristics and control factors for maintaining stable production of the gas field. The main reservoir characteristics of Majiagou Formation were analyzed by means of core observation,thin section identification and cathodoluminescence. The results show that the reservoir of Majiagou Formation is mainly granular crystalline dolomite,grain crystalline dolomite and microbiological rock. The reservoir pores are mainly intercrystalline pore,intercrystalline dissolved pore,gypsum mould pore,miniature dissolved holes,intergranular pores. Reservoir distribution is mainly controlled by karstification and paleogeomorphic distribution. Epidiagenetic karstification in the Caledonian period has little contribution to the reservoir,even a destructive effect. The high part of karst palaeogeomorphology is mainly affected by epidiagenetic karstification,which has a certain transformation effect on the reservoir space and connectivity,resulting in better reservoir physical properties and high gas production per well,while the low part of karst palaeogeomorphology is mainly affected by the karstification in the quasi-contemporaneous period, with relatively poor physical properties and low gas production per well. The research results can provide geological basis for the prediction of favorable areas of Lower Paleozoic gas reservoirs in Sulige Gas Field.

Key words: reservoir characteristics, controlling factors, Lower Paleozoic, Sulige Gas Field

CLC Number: 

  • TE122.2+3
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