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海陆过渡相页岩孔隙结构特征及分形维数研究.docx

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海陆过渡相页岩孔隙结构特征及分形维数研究 Abstract Thestudyofporestructureandfractaldimensionoftransitionalfaciesshaleinmarine-continentaltransitionzoneprovidesanimportantreferencefortheevaluationofshalegasreservoirsinthisarea.Inthispaper,wehaveanalyzedtheporestructurecharacteristicsoftransitionalfaciesshaleandcalculatedthefractaldimensionvalues.Theresultsshowthatthetransitionalfaciesshaleinmarine-continentaltransitionzonehascomplexporestructures,whicharedominatedbyintergranularporesandorganicmatterpores.Thefractaldimensionsofthetransitionalfaciesshaleporesindicateastrongcorrelationwiththemineralcompositionsandorganiccontent.Theporestructuresandfractaldimensionsoftransitionalfaciesshalearesignificantindicatorsfordeterminingshalegasexplorationpotentialinmarine-continentaltransitionzonereservoirs. Introduction Shalegashasbecomeanimportantenergyresourceduetoitslargereservesandhighenergydensity.Themarine-continentaltransitionzoneisakeyareafortheexplorationandexploitationofshalegasreservoirsinChina.However,theexploitationofshalegasinthisareaissubjecttochallengesduetothecomplexgeologicalconditionsanddifficultiesinreservoircharacterization.Theporestructureandfractaldimensionofshaleareimportantfactorsaffectingshalegasstorageandflowbehavior.Therefore,studyingtheporestructureandfractaldimensionoftransitionalfaciesshaleinmarine-continentaltransitionzonehasgreatsignificancefortheexplorationanddevelopmentofshalegasresourcesinthisarea. Materialsandmethods Thesamplesusedinthisstudywerecollectedfromtransitionalfaciesshaleinthemarine-continentaltransitionzoneofSouthChina.Thesamplesweresubjectedtoscanningelectronmicroscopy(SEM)andmercuryinjectioncapillarypressure(MICP)teststoanalyzetheporestructurecharacteristicsandfractaldimensionsoftheshale. Results Thetransitionalfaciesshaleinmarine-continentaltransitionzoneismainlycomposedofclayminerals,quartz,feldspar,andminoramountsofcalciteandpyrite.Theporestructuresoftransitionalfaciesshalearedominatedbyintergranularpores,organicmatterpores,andmicro-fractures.The