A study of the Controlling Factors on the Resistivity of FracturedReservoir Using the Numerical Simulation
Received date: 2013-04-17
Revised date: 2013-05-14
Online published: 2014-02-10
Many factors affects the resistivity of fractured reservoir,and the reservoir conductive mechanism is complex.Based on the dual laterolog principle,through the construction of reasonable geological model,the resistivity of water saturated fractured rock and oil saturated fractured rock was simulated theoretically,and the factors are analyzed.The factors include resistivity of formation water,resistivity of matrix,fracture dip,fracture width,porosity of matrix,M value,and so on.At last,the affecting degree to resistivity of reservoir is discussed.The simulated results showed that:(1)With the increasing of the resistivity of matrix,the resistivity of reservoir gradually increases,and the increasing degree of oil saturated fractured rock is bigger than that of the water saturated fractured rock.The affecting degree of fluid properties for the resistivity of reservoir increases gradually with the increase of the resistivity of matrix.(2)The resistivity of matrix is fixed.With the increasing of the resistivity of formation water and fracture dip,the resistivity of reservoir gradually increases,but for the fracture width,the condition is opposite.The affecting degree of water saturated fractured rock is bigger than that of the oil saturated fractured rock,and the affecting degree of fluid properties for the resistivity of reservoir increases gradually with the reduction of the resistivity of formation water and fracture dip and the increasing of fracture width.(3)The resistivity of matrix was determined by archie formula.With the increasing of the porosity of matrix,the resistivity of reservoir gradually reduced,but for the M value,the condition is opposite.The affecting degree of oil saturated fractured rock is bigger than that of the water saturated fractured rock,and the affecting degree of fluid properties for the resistivity of reservoir increases gradually with the reduction of the porosity of matrix and increasing of M value.(4)The affecting degree of M value and the resistivity of matrix for the resistivity of reservoir are the largest,followed by the factors including fracture dip and fracture width,and the influence of the resistivity of formation water is the smallest.
Key words： Fractured reservoir; Geological model; Theoretical simulation; Resistivity
ZHANG Zhao-hui，GAO Chu-qiao，GAO Yong-de . A study of the Controlling Factors on the Resistivity of FracturedReservoir Using the Numerical Simulation[J]. Natural Gas Geoscience, 2014 , 25(2) : 252 -258 . DOI: 10.11764/j.issn.1672-1926.2014.02.252
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