Study On Yields Calculation Of Geochemical Elemental Logging Of Shale Reservoir

Shale reservoir exploration and development become a hot direction in the field of unconventional reservoir exploration.because of complex Structure,lithology complex mineral composition,complex pore structure,the complex distribution characteristics of the gas,strong heterogeneity and anisotropy,low porosity and low permeability features,the conventional logging technology have some deficiencies in the shale reservoir exploration and development.Geochemical elemental logging technology is currently the only logging contributes to the reservoir lithology evaluation by means of the point of view of rock chemical composition,it can directly provide formation elements weight percentage,and the prerequisite for obtaining accurate formation elements weight percentage is element yields calculation accuracy.Therefore,it is necessary to research the calculation methods of yields.This paper introduces the mathematical process of yields calculation,obtained capture spectra and Inelastic spectra by modeling simulation elements logging instrument and Different element configuration of simulated formation through Monte Carlo numerical simulation technology.Have the research on the new damped least-square & inverse matrix mathematical algorithm On the basis of the least squares method,and the damped least-square & inverse matrix method is used for spectrum analysis by programming.Finally compared with the traditional weighted least squares calculation accuracy.researches shows that the damped least-square & inverse matrix method With the better accuracy.In the solution Spectral Analysis calculation process,increasing in the number of element configuration have a strong affected to the Spectral Analysis accuracy and use Smooth processing technology,cut H form mixed spectrum technology iteration Spectral Analysis Yields correction technology can Improve the accuracy of the yields calculation.