A study on distribution features of movable fluids for Chang 7 tight reservoir in Ordos Basin
Received date: 2016-06-06
Revised date: 2016-10-17
Online published: 2017-01-10
Ordos Basin is abundant in tight oil resource in Chang 7 Formation.Physical properties are poor in the reservoir with air permeability of less than 0.3×10-3μm2.This reservoir can be evaluated by movable fluid saturation which is considered as one of the most significant parameters.Combined with centrifuge tests and NMR T2 spectrum analysis,the movable fluids distribution of Chang 7 tight reservoir in Ordos Basin was figured out.The results show that:firstly,the average mono-phase saturation of movable water in Chang 7 tight oil reservoirs is 39.40%.While the movable water saturation in the pore throat which are divided to micron (greater than 1μm),sub-micron(0.1 to 1μm) or nano(less than 0.1μm),are respectively 2.2%,25.67% and 11.52%;the average movable oil saturation is 26.07% in bound water saturation,and the movable oil saturation in micron,submicron or nano-pore throat is 0.79%,9.48% and 15.81%,respectively;the movable fluids exist mainly in the submicron and nano-pore throat.Second,the movable water or oil saturation will increase with the increase of core permeability,but the trends of movable fluids saturation differ from the size of pore throat.When throat radius is 0.1 to 0.5 micrometer,the movable fluids saturation increases the biggest growth with core permeability,next is the radius of 0.5 to 1.0 micrometer,and the radius greater than 1.0 micrometer,the growth is the least.However,when throat radius is less than 0.1 micrometer,the relative contents of movable fluids saturation decrease obviously.
Lei Qi-hong，Cheng Liang-bing，Wang Chong，Fan Jian-ming，He You-an，Zhao Guo-xi . A study on distribution features of movable fluids for Chang 7 tight reservoir in Ordos Basin[J]. Natural Gas Geoscience, 2017 , 28(1) : 26 -31 . DOI: 10.11764/j.issn.1672-1926.2016.11.017
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