Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 140-149.doi: 10.3969/j.issn.1673-8926.2018.01.014

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Distribution characteristics and influencing factors of movable fluid in tight sandstone reservoirs: a case study of Lucaogou Formation in Jimsar Sag,NW China

LI Min, WANG Hao, CHEN Meng   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
  • Received:2017-05-12 Revised:2017-08-23 Online:2018-01-21 Published:2018-01-21

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Abstract: Determining the content,distribution and influencing factors of movable fluid is the basis for effective evaluation of the development potential of tight reservoir. 21 samples of tight sandstone reservoirs of Lucaogou Formation in Junggar Basin were selected to measure the NMR T2 spectrum at different degrees of water saturation by using NMR T2 spectrum analysis and centrifuge tests,and the influencing factors of the differences in the movable fluid were analyzed by cast thin section and scanning electron microscopy. The results show that the T2 spectrum of reservoir rocks is mainly manifested by five forms,and the complexity of reservoir micro-characteristics and pore throat structure are the main reasons for the various types of NMR T2 spectrum. The best centrifugal force for tight oil reservoir to make bound water state is 400-450 psi,the saturation of movable fluid is 29.44%-68.92%,and the average value is 46.69%. The content and distribution of the movable fluid in different rock samples are obviously different,and the minimum of pore throat radius of the movable fluid distribution is about 50 nm,and the mainstream throat radius is 70-200 nm. The relationship between movable fluid content and physical property shows that for the reservoirs with poor physical properties,the permeability is the main controlling factors,but for the reservoirs with better physical properties,the impact of permeability on the movable fluid content is small. The pore type,shape and surface roughness all affect the content and distribution of the bound water. The development and distribution of secondary pores,the size of pore throat and its connectivity,the filling degree and occurrence of clay minerals and the development of cracks,are the influencing factors of movable fluid content. These results can provide a basis for evaluating the development potential of tight reservoirs.

Key words: submarine fan, deepwater exploration, provenance system, Sanya Formation, Qiongdongnan Basin

CLC Number: 

  • TE122.2+3
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