Rock physics modeling of fractured-porous shale reservoirs and petrophysical parameters prediction
Concerning the complex pore structures and organic-rich characteristics of shale reservoirs,we establish an anisotropic rock physics modeling scheme,for the organic-rich fractured-porous shale reservoirs by using the Voigt-Reuss-Hill average,the inclusion-based model,the Schoenberg's model,as well as the anisotropic Gassmann equation.Based on the developed model,we investigate the effects of total porosity,kerogen content,fracture volume and shale content on the elastic responses in detail.Then,an anisotropic 2D rock physics template of the P-wave impedance versus Vp/Vs ratio is constructed and tested using well-log data acquired at well A in the study area.The alignment of the superimposed data clusters is consistent with the variation trend of the template,demonstrating that the built anisotropic template shows promise in interpreting the reservoir parameters of shale reservoirs.In addition,we predict the shear wave velocity for well A based on the developed model.The good agreement between the measured and predicted values validates the practicability of our model.Finally,we choose a cross-well seismic data to predict the spatial distribution of the Total Organic Carbon(TOC)content and shale content based on the proposed model and the very fast simulated annealing algorithm.The application result shows that the predicted TOC content and shale content both match well with those logging interpretation results,confirming the effectiveness and reliability of the developed model in predicting shale reservoir properties.
Fractured-porous shaleRock physics modelingAnisotropic rock physics templateReservoir property prediction
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