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Mineral characteristic of rocks and its impact on the reservoir quality of He 8 tight sandstone of Tianhuan area,Ordos Basin

Gao Yang1,2,3,Wang Zhi-zhang1,Yi Shi-wei2,3,She Yuan-qi2,3,Lin Shi-guo2,3,Li Ming-peng2,3,Zhang Chun-lin2,3   

  1. 1.China University of Petroleum,Beijing  102249;2.PetroChina Research Institute of Petroleum Exploration & Development,Langfang 065007;
    3.Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007
  • Received:2018-10-26 Revised:2018-12-13 Online:2019-03-10

Abstract: Tight sandstone reservoir has low porosity,low permeability and strong heterogeneity,therefore reservoir quality is the main risk in exploration.In this paper,research on effects of petrology and cementation on the quality of different types of tight sandstone reservoirs in the He 8 member of Tianhuan area,Ordos Basin,is carried out by means of common casting thin sections,field-emission scanning electron microscope,and inclusion temperature analysis.So,this study is of great importance on potential gas reservoir explorations.The results show that quartz overgrowth,kaolinite and illite are the main cementation to control the quality of sandstone in the He 8 member,while ductile rock fragment is another key factor to influence the quality.The main pore types of quartz sandstone are secondary pores,and the reservoir quality is mainly controlled by quartz overgrowth,as well as development of kaolinite.The average permeability is 0.78×10-3μm2,while the porosity is 7.6%.The main pore type of lithic sandstone is intercrystal pore,and the reservoir turns into tight sandstone very early due to illite cementation and the high content of ductile rock fragment.The average porosity is 4.31%,while the permeability is 0.07×10-3μm2.The mineral component content of lithic quartz sandstones is between that of quartz sandstones and lithic sandstones.Early compaction and secondary pore development are the two main factors that controls the reservoir quality.The average porosity is 6.64% and the average permeability is 0.34×10-3μm2.

Key words: Ordos Basin, Tight sandstone gas reservoir, Shihezi Formation, Petrological component, Cementation

CLC Number: 

  • TE122.2
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