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Analysis of the characteristics and its influencing factors of horizontal movable fluid in the Chang 7 tight reservoir in Longdong area,Ordos Basin

Guo Rui-liang,Chen Xiao-dong,Ma Xiao-feng,Ma Jing,Wang Qi,Chen Lin   

  1. (1.Key Laboratory of Petroleum Resources Research,Gausu Province/ Key Laboratory of Reasearch,
    Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Exploration & Development Research Institute of Changqing Oilfield Company,PetroChina,Xi’aan 710018,China;
    4.Key Lab of Tectonics and Petroleum Resource of Educational Ministry,China University of Geosciences,Wuhan 430074,China)
  • Received:2018-03-26 Revised:2018-04-10 Online:2018-05-10 Published:2018-05-10

Abstract:

The movable fluid distribution,evaluation and the controlling factors of 6 samples (horizontal span 44.48m) from Chang 7 tight oil reservoir of the horizontal well in Longdong area,Ordos Basin was analyzed mainly by using the centrifugal and NMR experiment,assisted with cast thin section,scanning electron microscopy,nano-scale CT scanning,X-diffraction clay mineral analysis and mercury injection.The results show that the T2 spectrum morphology of tight oil reservoir has double peaks with the left peak higher than the right one.The movable fluid is mainly distributed in the middle and large pores,and there is a significant difference in the proportion of the small pores and the large and medium pores.Both reservoir porosity and permeability have high relationship with the T2 cutoff.The lower limit of throat radius of movable fluid is determined by using transformation of NMR T2 distribution to pore throat radius distribution.The results show that the lower limit of throat radius of movable fluids of 6 samples differs 10.5 times,with an average of 0.62μm.The distribution characteristics and deviation of movable fluid parameters show that the horizontal heterogeneity of Chang 7 tight oil reservoir is high.The distribution of pore and throat,development degree of secondary porosity,connectivity between pore and throat,the content,the occurrence states,and the filling degree of clay mineral,development degree and filling degree of micro-fracture are the factors to cause deviation of movable fluid parameters,while development of feldspar dissolution pores and pores filled with honeycomb and bridging illite are the main controlling factor.

Key words: Tight reservoir, NMR, T 2 spectrum, Movable fluid, Yanchang Formation, Chang 7 section, Longdong area

CLC Number: 

  • TE122.1

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