Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 52-60.doi: 10.12108/yxyqc.20190506

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Pore structure characteristics and adsorption capacity of Niutitang Formation shale in southern Shaanxi

CHEN Xianglin1,2, GUO Tianxu1,2, SHI Dishi1,2, HOU Qidong3, WANG Chao1,2   

  1. 1. Oil and Gas Resources Survey Center, China Geological Survey, Beijing 100083, China;
    2. Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100029, China;
    3. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2018-11-27 Revised:2019-02-06 Online:2019-09-21 Published:2019-09-16

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Abstract: In order to reveal the pore structure characteristics and adsorption capacity of rich organic shale of Cambrian Niutitang Formation in southern Shaanxi,a series of experimental testing techniques and methods such as field emission scanning electron microscopy,organic geochemistry,X-ray diffraction(XRD),nitrogen adsorption and isothermal adsorption experiment,were used to study the pore structure types by combining qualitative observation and quantitative characterization,and the main controlling factors of pore structure and adsorption capacity of shale were discussed. The results show that the main shale pore types of Niutitang Formation are organic pores,intragranular pores,intergranular pore and microfractures. The pore diameter is 1.8-316.7 nm, the BET specific surface area is 1.34-13.20 m2/g with an average value of 6.83 m2/g,the BJH adsorbed total pore volume is 0.003-0.011 mL/g with an average value of 0.006 mL/g. The direct factors affecting shale pore development are total organic carbon content and thermal maturity,which are positively correlated with pore volume and specific surface area. The indirect factors affecting shale pore development are tectonic movement and sedimentary environment around Hannan paleo-uplift and,which have great influences on thermal maturity,burial depth, thickness and lithologic changes of Niutitang Formation shale,thus indirectly control the development of shale pore structure. The adsorption capacity of shale is mainly affected by total organic carbon content,pore volume and specific surface area,which are positively correlated with methane adsorption volume. The research results are of great significance to the potential evaluation of Cambrian shale gas resources and the evaluation of selected areas in southern Shaanxi.

Key words: pore structure, adsorption capacity, shale gas, Niutitang Formation, southern Shaanxi

CLC Number: 

  • P618.13
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