Study On The Microscopic Wettability Of Sandstone Based On Fourier Transform Infrared Spectroscopy

Based on the Fourier transform infrared spectrum and static contact Angle experiment,this paper studies the influence of mineral composition,chemical group type,number and density,macroscopic wetting contact Angle,particle size on ir spectra,zeta potential,pH and ion concentration on zeta potential,interaction model between hydrophilic groups,the correlation between the surface force of the mineral surface and contact Angle,the relationship between zeta potential and contact Angle,and the relationship between the contact Angle and the contact Angle.The purpose of this paper is to study the micro-wettability of the reservoir from the perspective of functional groups.Firstly,by means of X diffraction experiment analysis of mineral composition of tight sandstone reservoir,and their respective types of mineral content,can be formed by X ray spectrum analysis Experimental Research on tight sandstone elements,the mass percentage and the molar percentage analysis the main elements from the spectrum,lay the foundation for the thesis;the second is the key part of this paper the FTIR scan through the tight sandstone reservoir core sample preparation,FTIR infrared spectra,analysis of the main functional groups of the types of tight sandstone reservoir surface location,characteristics and strength combined with each library and the absorption peak,according to the peak area of the absorption peak of the proportion of different groups.The action of protonation and deprotonation on minerals and rocks under the action of inorganic ions in the solution will change the charge types and charged quantities on the surface of minerals,and the uneven charges on the mineral surface will generate Zeta potential.The species and density of groups of mineral surface can by Zeta potential;Laboratory of wettability determination of dense sandstone cores by the sessile drop method,the determination of the pH under different contact angle will get a set of contact angle experiments,determine the macro wettability of tight sandstone reservoir cores.The force between the particles of mineral surface will produce a potential reservoir of tight sandstone surface interparticle force model,the relationship between the groups and the contact angle based on the measured value to get different pH values under the condition of contact angle calculation,according to the experimental contact to determine the micro wettability of tight sandstone reservoir cores and the value compared the FTIR technique for characterization of tight sandstone reservoirwettability is accurate and based on experimental data.