首页|Using digital rock physics to investigate the impacts of diagenesis events and pathways on rock properties
Using digital rock physics to investigate the impacts of diagenesis events and pathways on rock properties
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Digital rock physics(DRP)has shown promising performance and more realistic results in predicting rock properties and investigating flow mechanisms in geomaterials.However,the application of DRP for studying the effects of diagenesis on rock properties using a systematic and accurate model has not been reported.During the formation of the sedimentary rocks,they may undergo various diagenesis events(e.g.,cementation and dissolution),and such events may occur along different pathways,which both make a significant effect on rock properties.With the aid of the DRP techniques,we present a comprehensive investigation of the effects of diagenesis events and diagenesis pathways on rock properties.In this paper,the original digital rock with multicomponent and irregular particles is constructed using the discrete element method(DEM).Then,the original model similarly undergoes four diagenesis events(two cementations and two dissolutions)along with two different diagenesis pathways for generating new models.The cementation and dissolution are simulated using a dilation operation and quartet structure generate set algorithm(QSGSA),respectively.Finally,some properties of pore space,transport,and elastic of all the models are analyzed and compared to investigate the effects of diagenesis events and pathways.The comparisons indicate that the final rock which experiences the cementation and then dissolution exhibits larger porosity,fractal dimension,aperture,coordination number,and permeability,and smaller tortuosity,formation factor,and elastic moduli than the one that undergoes the dissolution and then cementation.Thus,the study will help us to better understand the variations of the flow and mechanical properties of rocks without conducting extensive experiments if rocks experience different diagenesis processes along different pathways.
Digital rock physicsDiagenesisDiscrete element methodCementationDissolutionPore system
Yuqi Wu、Pejman Tahmasebi、Chengyan Lin
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Shandong Provincial Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China
Department of Petroleum Engineering,University of Wyoming,Laramie 82071,USA
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