Distribution characteristics and controlling factors of movable fluid in tight oil reservoir:A case study of Chang 7 reservoir in Ordos Basin

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  • 1.Exploration and Development Research Institute of Changqing Oilfield Company,PetroChina,Xi’an; 710018,China;
    2.National Engineering Laboratory for Low Permeability Petroleum Exploration and Development,Xi’an 710018,China;
    3.Key Laboratory of Continental Dynamics of Ministry of Education,Northwest University,Xi’an 710069,China;
    4.3rd Oil Production Plant of Changqing Oilfield Company,PetroChina,Yinchuan 750000,China

Received date: 2015-07-31

  Revised date: 2015-10-22

  Online published: 2019-09-20

Abstract

The micro-porosity structure of tight oil reservoir is complex,and distribution characteristics of the fluid in tight oil reservoir are very different from that of low permeability reservoir.The movable fluid evaluation of the Chang 7 reservoir in the Ordos Basin was conducted by using nuclear magnetic resonance (NMR) technology,and the controlling factors of the differences in the movable fluid were analyzed by cast thin section,scanning electron microscopy,high pressure mercury injection,high-resolution computed tomography.The results show that T2 pattern of the tight oil reservoir displays six modes,the content of the immovable fluid is high in middle and large pore,which lead to the parameters of movable fluid being low,and the amplitude of variation and the differences in tight oil reservoir are large among different samples.The relationships are higher between the reservoir permeability and the parameters of movable fluid.The physical properties of the reservoir are better,and the change of the movable fluid parameters is greater.The microstructure characteristics of the tight oil reservoir,such as the distribution of pore and throat radius,development degree of induced porosity and connectivity between pore and throat radius,development degree and availability of micro-fracture,the content,the occurrence states,and the filling degree,are the main controlling factors to cause deviation of movable fluid parameters.

Cite this article

Shi Jian-chao, Qu Xue-feng, Lei Qi-hong, Fu Bo, He You-an, Zhao Guo-xi, Cheng Liang-bing . Distribution characteristics and controlling factors of movable fluid in tight oil reservoir:A case study of Chang 7 reservoir in Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(5) : 827 -834 . DOI: 10.11764/j.issn.1672-1926.2016.05.0827

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