Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 42-53.doi: 10.12108/yxyqc.20190405

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of clay minerals and its impacts on reservoir quality of tight sandstone gas reservoir: a case from Sulige Gas Field,Ordos Basin

REN Dazhong1,2, ZHOU Zhaohua3, LIANG Ruixiang4, ZHOU Ran5, LIU Na6,7, NAN Junxiang6,7   

  1. 1. College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    3. Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, Hebei China;
    4. No.8 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
    5. Drilling and Production Technology Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Xi'an 710021, China;
    6. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    7. Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2019-01-28 Revised:2019-03-24 Online:2019-07-21 Published:2019-06-21

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Abstract: In order to study the reservoir properties of tight sandstone gas reservoirs,based on quantitative evaluation of clay mineral occurrence by X-ray diffraction,combined with the data of thin sections(TS),scanning electron microscopy(SEM),pressure-controlled mercury intrusion(PCMI)and nuclear magnetic resonance (NMR),physical properties,pore structure and factors affecting movable fluids were studied on 15 clay mineral samples from tight sandstone gas reservoir of the Permian He 8 member in Sulige Gas Field,Ordos Basin. The results show that illite(3.07%)and kaolinite(1.86%)are typical clay mineral in the study area. The clay minerals could provide abundant pore space and were the indirect evidence of the appearance of dissolved pores. Chlorite filled the pores,and a large number of illite and I/S mixed layer would also deteriorate reservoir properties. Movable fluid parameters took the hydrophilic minerals on the pore surface into account,highlighting the relationship between hydrophilic clay and occurrence characteristics of movable fluid(R2>0.70). This research provides insights into studying the coupling relationship between clay minerals and reservoir quality and theoretical basis and practical guidance for the gas production.

Key words: clay minerals, reservoir quality, tight sandstone gas reservoir, Permian, Ordos Basin

CLC Number: 

  • TE122.2
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