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四川盆地下古生界页岩气研究现状及勘探前景.docx

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四川盆地下古生界页岩气研究现状及勘探前景 Abstract TheSichuanBasinisoneofthemostpromisingareasforshalegasexplorationinChina.TheshalegasresourcesintheLowerPaleozoicstrataarethemostimportanttargetsforexploration.ThispaperreviewsthecurrentresearchonshalegasintheLowerPaleozoicstrataintheSichuanBasin,includingthegeologicalcharacteristicsoftheshalegasreservoirs,themethodsforevaluatingtheshalegasresources,andtheexplorationanddevelopmentstatus.ThepaperalsodiscussesthefutureprospectsofshalegasexplorationintheSichuanBasin. Introduction Shalegasisanunconventionalnaturalgasresourcethatistrappedwithinshaleformations.Inrecentyears,shalegashasattractedincreasingattentionfromtheoilandgasindustryduetoitsvastpotentialresources,lowexplorationcosts,andenvironmentalbenefits.Chinahaslargeshalegasresources,withtheSichuanBasinbeingoneofthemostimportantareasforshalegasexploration. LocatedinsouthwesternChina,theSichuanBasinhasalargeareaofPaleozoicstrata,whichcontainabundantshalegasresources.TheLowerPaleozoicstrata,includingtheCambrianandOrdovicianformations,arethemostimportanttargetsforshalegasexploration.Inrecentyears,manyresearchstudieshavebeenconductedtobetterunderstandthegeologicalcharacteristicsoftheshalegasreservoirs,toevaluatetheshalegasresources,andtoexploreanddevelopshalegasintheSichuanBasin. GeologicalCharacteristicsoftheShaleGasReservoirs TheshalegasreservoirsintheLowerPaleozoicstrataoftheSichuanBasinhaveuniquegeologicalcharacteristicsthatmakethemsuitableforshalegasexploration.Thereservoirsarecharacterizedbyacomplexlithology,ahighorganiccontent,alowpermeability,andahighporosity.TheCambrianandOrdovicianformationsarerichinorganicmatter,andarecomposedmainlyofshale,withsomeinterbeddedsandstoneandlimestonelayers. ThemainoilandgassourcerocksintheCambrian-Ordovicianformationsareorganic-richshales,whichprovidetheidealconditionsforshalegasgeneration.TheorganicmatterintheshalesismainlycomposedoftypeIIandIIIkerogen,whichhasahighpotentialforoilandgasgeneration.Inaddition,theshalegasreservoirsintheLowerPaleozoicst