四川盆地上奥陶统五峰组-下志留统龙马溪组页岩关键矿物成岩演化及其控储作用

四川盆地上奥陶统五峰组—下志留统龙马溪组页岩关键矿物成岩演化及其控储作用一、本文概述Overviewofthisarticle本文旨在深入研究和探讨四川盆地上奥陶统五峰组至下志留统龙马溪组页岩的关键矿物成岩演化过程，以及这些过程如何控制储层的形成和分布。四川盆地作为中国西南地区的一个重要沉积盆地，其页岩气资源的勘探和开发对于我国能源结构的优化和清洁能源的发展具有重要意义。五峰组和龙马溪组页岩作为四川盆地页岩气勘探的主要目标层位，其成岩演化和储层特性研究对于提高页岩气勘探成功率和开发效益具有关键作用。Thisarticleaimstoconductin-depthresearchandexplorationonthekeymineraldiageneticevolutionprocessesofshalefromtheUpperOrdovicianWufengFormationtotheLowerSilurianLongmaxiFormationintheSichuanBasin,andhowtheseprocessescontroltheformationanddistributionofreservoirs.AsanimportantsedimentarybasininsouthwesternChina,theexplorationanddevelopmentofshalegasresourcesintheSichuanBasinareofgreatsignificancefortheoptimizationofChina'senergystructureandthedevelopmentofcleanenergy.TheWufengFormationandLongmaxiFormationshalearethemaintargetlayersforshalegasexplorationintheSichuanBasin.Thestudyoftheirdiageneticevolutionandreservoircharacteristicsplaysacrucialroleinimprovingthesuccessrateanddevelopmentefficiencyofshalegasexploration.本文首先通过详细的野外地质调查和岩心观察，结合岩石学、矿物学、地球化学等多学科的理论和方法，对五峰组和龙马溪组页岩的岩性、岩石学特征、矿物组成和分布进行系统的分析。在此基础上，重点探讨页岩中关键矿物的成岩演化过程，包括矿物的形成、转化、交代和溶解等过程，以及这些过程对页岩储层物性、孔隙结构、渗透率等关键储层参数的影响。Thisarticlefirstsystematicallyanalyzesthelithology,petrologicalcharacteristics,mineralcomposition,anddistributionofshaleintheWufengandLongmaxiformationsthroughdetailedfieldgeologicalsurveysandcoreobservations,combinedwiththeoriesandmethodsfrommultipledisciplinessuchaspetrology,mineralogy,andgeochemistry.Onthisbasis,thefocusisonexploringthediageneticevolutionprocessofkeymineralsinshale,includingtheformation,transformation,metasomatism,anddissolutionofminerals,aswellastheimpactoftheseprocessesonkeyreservoirparameterssuchasshalereservoirproperties,porestructure,andpermeability.本文还将关注成岩演化过程中各种地质因素（如温度、压力、流体性质等）对矿物成岩演化的控制作用，以及这些地质因素如何与页岩储层的形成和分布相互作用。通过对这些控制因素的分析，可以更深入地理解页岩储层的形成机制和分布规律，为页岩气勘探和开发提供更为准确的地质依据。Thisarticlewillalsofocusonthecontrolofvariousgeologicalfactors(suchastemperature,pressure,fluidproperties,etc.)onmineraldiageneticevolutionduringtheprocessofdiagenesis,andhowthesegeologicalfactorsinteractwiththeformationanddistributionofshalereservoirs.Byanalyzingthesecontrolfactors,wecangainadeeperunderstandingoftheformationmechanismanddistributionpatternsofshalereservoirs,providingmoreaccurategeologicalbasisforshalegasexplorationanddevelopment.本文旨在通过系统的研究和分析，揭示四川盆地上奥陶统五峰组至下志留统龙马溪组页岩的关键矿物成岩演化过程及其控储作用，为页岩气资源的勘探和开发提供理论基础和技术支持。ThisarticleaimstorevealthekeymineraldiageneticevolutionprocessandreservoircontrolofshalefromtheUpperOrdovicianWufengFormationtotheLowerSilurianLongmaxiFormationintheSichuanBasinthroughsystematicresearchandanalysis,providingtheoreticalbasisandtechnicalsupportfortheexplorationanddevelopmentofshalegasresources.二、关键矿物成岩演化研究Researchonthediageneticevolutionofkeyminerals四川盆地上奥陶统五峰组—下志留统龙马溪组页岩，作为中国南方重要的烃源岩和储层，其成岩演化过程及其与储层物性的关系一直是研究的热点。本研究针对这一地区的关键矿物，深入探讨了其成岩演化的过程及其控储作用。TheshaleoftheUpperOrdovicianWufengFormationandLowerSilurianLongmaxiFormationintheSichuanBasin,asanimportantsourcerockandreservoirinsouthernChina,hasalwaysbeenahotresearchtopicintermsofitsdiageneticevolutionprocessanditsrelationshipwithreservoirproperties.Thisstudyfocusesonthekeymineralsinthisregionandexploresindepththeprocessoftheirdiageneticevolutionandtheircontrollingstorageeffects.在成岩演化的研究中，我们首先识别了页岩中的主要矿物成分，包括石英、粘土矿物、碳酸盐矿物等。这些矿物的成因、来源及其在成岩过程中的转化与演化是研究的重点。通过详细的岩石学观察、矿物学分析以及地球化学研究，我们发现五峰组—龙马溪组页岩经历了从沉积到成岩的复杂过程。在这个过程中，矿物成分发生了显著的变化，如石英经历了压实和溶解作用，粘土矿物则经历了转化和重结晶过程。Inthestudyofdiageneticevolution,wefirstidentifiedthemainmineralcomponentsinshale,includingquartz,clayminerals,carbonateminerals,etc.Theorigin,sources,andtransformationandevolutionofthesemineralsduringdiagenesisarethefocusofresearch.Throughdetailedpetrologicalobservation,mineralogicalanalysis,andgeochemicalresearch,wehavefoundthattheshaleoftheWufengLongmaxiFormationhasundergoneacomplexprocessfromsedimentationtodiagenesis.Duringthisprocess,significantchangesoccurinmineralcomposition,suchasquartzundergoingcompactionanddissolution,andclaymineralsundergoingtransformationandrecrystallization.我们还重点研究了成岩过程中关键矿物的演化及其对储层物性的影响。例如，粘土矿物的转化和重结晶过程中，页岩的孔隙度和渗透率发生了显著变化。这种变化不仅影响了页岩的储油能力，还对其油气的运移和聚集产生了重要影响。Wealsofocusedonstudyingtheevolutionofkeymineralsduringdiagenesisandtheirimpactonreservoirproperties.Forexample,duringthetransformationandrecrystallizationprocessofclayminerals,theporosityandpermeabilityofshaleundergosignificantchanges.Thischangenotonlyaffectstheoilstoragecapacityofshale,butalsohasasignificantimpactonitsoilandgasmigrationandaccumulation.为了更好地理解这一过程，我们还利用了一系列现代分析技术，如扫描电子显微镜（SEM）、射线衍射（RD）和能谱分析（EDS）等，对页岩的微观结构和矿物组成进行了详细分析。这些分析为我们提供了关于成岩演化过程的直接证据，并加深了我们对这一过程的理解。Inordertobetterunderstandthisprocess,wealsoutilizedaseriesofmodernanalyticaltechniquessuchasscanningelectronmicroscopy(SEM),X-raydiffraction(RD),andenergydispersivespectroscopy(EDS)toconductadetailedanalysisofthemicrostructureandmineralcompositionofshale.Theseanalysesprovideuswithdirectevidenceabouttheprocessofdiageneticevolutionanddeepenourunderstandingofthisprocess.五峰组—龙马溪组页岩的关键矿物成岩演化是一个复杂的过程，涉及多种矿物的转化和演化。这一过程不仅影响了页岩的储层物性，还对其油气的生成、运移和聚集产生了重要影响。因此，深入研究这一过程对于理解四川盆地页岩气藏的形成和分布具有重要意义。ThediageneticevolutionofkeymineralsintheshaleoftheWufengLongmaxiFormationisacomplexprocessinvolvingthetransformationandevolutionofmultipleminerals.Thisprocessnotonlyaffectsthereservoirpropertiesofshale,butalsohasasignificantimpactonitsoilandgasgeneration,migration,andaccumulation.Therefore,in-depthstudyofthisprocessisofgreatsignificanceforunderstandingtheformationanddistributionofshalegasreservoirsintheSichuanBasin.三、关键矿物对储层的控制作用Thecontroleffectofkeymineralsonreservoirs四川盆地上奥陶统五峰组—下志留统龙马溪组页岩储层的关键矿物主要包括粘土矿物、石英、碳酸盐矿物和有机质等。这些矿物的成岩演化过程对储层的物性、孔隙结构和油气储集能力具有重要影响。ThekeymineralsintheshalereservoirsoftheUpperOrdovicianWufengFormationandLowerSilurianLongmaxiFormationintheSichuanBasinmainlyincludeclayminerals,quartz,carbonateminerals,andorganicmatter.Thediageneticevolutionprocessofthesemineralshasasignificantimpactonthephysicalproperties,porestructure,andoilandgasstoragecapacityofthereservoir.粘土矿物是页岩储层中最主要的杂基成分，其含量和分布特征对储层孔隙度和渗透率具有显著影响。在成岩过程中，粘土矿物的转化和重结晶作用会导致储层孔隙的减少和喉道的堵塞，从而降低储层的储集能力。粘土矿物的膨胀和收缩作用还会引起储层裂缝的发育，进一步影响储层的连通性和油气运移。Claymineralsarethemainimpuritiesinshalereservoirs,andtheircontentanddistributioncharacteristicshaveasignificantimpactonreservoirporosityandpermeability.Duringthediagenesisprocess,thetransformationandrecrystallizationofclaymineralscanleadtoareductioninreservoirporesandblockageofthroats,therebyreducingthereservoir'sstoragecapacity.Theexpansionandcontractionofclaymineralscanalsocausethedevelopmentofreservoirfractures,furtheraffectingreservoirconnectivityandoilandgasmigration.石英是页岩储层中的主要骨架矿物，其含量和形态对储层的抗压实能力和稳定性具有重要作用。在成岩过程中，石英颗粒的溶解和再沉淀作用可以形成次生孔隙，增加储层的孔隙度和渗透率。同时，石英颗粒的定向排列和颗粒间的紧密接触可以提高储层的抗压实能力，有利于保持储层的孔隙结构和储集能力。Quartzisthemainskeletonmineralinshalereservoirs,anditscontentandmorphologyplayanimportantroleintheanticompactionabilityandstabilityofthereservoir.Duringthediagenesisprocess,thedissolutionandreprecipitationofquartzparticlescanformsecondarypores,increasingtheporosityandpermeabilityofthereservoir.Atthesametime,thedirectionalarrangementofquartzparticlesandtheclosecontactbetweenparticlescanimprovethecompactionresistanceofthereservoir,whichisbeneficialformaintainingtheporestructureandstoragecapacityofthereservoir.碳酸盐矿物是页岩储层中的重要组分之一，其含量和类型对储层的物性和油气储集能力具有重要影响。在成岩过程中，碳酸盐矿物的溶解和再沉淀作用可以形成溶蚀孔和溶洞，增加储层的孔隙度和储集空间。碳酸盐矿物的胶结作用还可以增强储层颗粒间的联结力，提高储层的稳定性和抗压实能力。Carbonatemineralsareoneoftheimportantcomponentsinshalereservoirs,andtheircontentandtypehaveasignificantimpactonthephysicalpropertiesandoilandgasstoragecapacityofthereservoir.Duringthediagenesisprocess,thedissolutionandreprecipitationofcarbonatemineralscanformdissolutionporesandcaves,increasingtheporosityandstoragespaceofthereservoir.Thecementationeffectofcarbonatemineralscanalsoenhancethebondingforcebetweenreservoirparticles,improvethestabilityandcompactionresistanceofthereservoir.有机质是页岩储层中的重要组成部分，其含量和类型对储层的油气生成和运移具有重要影响。在成岩过程中，有机质的热演化和生烃作用可以形成油气藏，增加储层的油气储集能力。有机质的分解和转化作用还可以形成微裂缝和微孔隙，增加储层的连通性和渗透率。Organicmatterisanimportantcomponentofshalereservoirs,anditscontentandtypehaveasignificantimpactonthegenerationandmigrationofoilandgasinthereservoir.Duringthediagenesisprocess,thethermalevolutionandhydrocarbongenerationoforganicmattercanformoilandgasreservoirs,increasingthereservoir'soilandgasstoragecapacity.Thedecompositionandtransformationoforganicmattercanalsoformmicrocracksandmicropores,increasingreservoirconnectivityandpermeability.关键矿物的成岩演化过程对四川盆地上奥陶统五峰组—下志留统龙马溪组页岩储层的物性、孔隙结构和油气储集能力具有重要影响。在储层评价和油气勘探开发中，应充分考虑关键矿物的成岩演化特征及其对储层的控制作用，以提高储层评价和油气勘探开发的准确性和有效性。Thediageneticevolutionprocessofkeymineralshasasignificantimpactonthephysicalproperties,porestructure,andoilandgasstoragecapacityofshalereservoirsintheUpperOrdovicianWufengFormationandLowerSilurianLongmaxiFormationintheSichuanBasin.Inreservoirevaluationandoilandgasexplorationanddevelopment,thediageneticevolutioncharacteristicsofkeymineralsandtheircontroloverthereservoirshouldbefullyconsideredtoimprovetheaccuracyandeffectivenessofreservoirevaluationandoilandgasexplorationanddevelopment.四、实例分析Exampleanalysis以四川盆地东部某区块为例，对该区块内上奥陶统五峰组和下志留统龙马溪组页岩进行了详细的实例分析。该区块地质条件复杂，页岩储层发育良好，具有较高的页岩气勘探潜力。TakingablockintheeasternpartoftheSichuanBasinasanexample,adetailedcaseanalysiswasconductedontheshaleoftheUpperOrdovicianWufengFormationandtheLowerSilurianLongmaxiFormationintheblock.Thegeologicalconditionsofthisblockarecomplex,withwell-developedshalereservoirsandhighpotentialforshalegasexploration.通过对该区块的页岩样品进行镜下观察、射线衍射分析、扫描电镜等综合分析手段，揭示了关键矿物如石英、粘土矿物、碳酸盐矿物等的成岩演化过程。石英在成岩过程中经历了压实作用、溶蚀作用和次生加大等演化过程，粘土矿物则主要经历了压实作用、转化作用和重结晶作用，碳酸盐矿物则主要以溶蚀作用为主。这些成岩演化过程对页岩的储层物性产生了显著影响。Throughcomprehensiveanalysismethodssuchasmicroscopicobservation,X-raydiffractionanalysis,andscanningelectronmicroscopy,thediageneticevolutionprocessofkeymineralssuchasquartz,clayminerals,andcarbonatemineralsintheshalesamplesoftheblockwasrevealed.Quartzundergoesevolutionprocessessuchascompaction,dissolution,andsecondaryenlargementduringdiagenesis,whileclaymineralsmainlyundergocompaction,transformation,andrecrystallization,whilecarbonatemineralsmainlyundergodissolution.Thesediageneticevolutionprocesseshaveasignificantimpactonthereservoirpropertiesofshale.在成岩演化的不同阶段，储层的孔隙度、渗透率等物性参数发生了明显变化。压实作用导致储层孔隙度减小，渗透率降低；溶蚀作用则形成了大量的次生孔隙，提高了储层的孔隙度和渗透率；次生加大和重结晶作用则进一步改变了储层的微观结构，对储层物性产生了复杂的影响。Atdifferentstagesofdiageneticevolution,physicalparameterssuchasporosityandpermeabilityofreservoirsundergosignificantchanges.Thecompactioneffectleadstoadecreaseinreservoirporosityandpermeability;Thedissolutionprocessformsalargenumberofsecondarypores,whichincreasestheporosityandpermeabilityofthereservoir;Thesecondaryenlargementandrecrystallizationfurtheralterthemicrostructureofthereservoirandhaveacompleximpactonitsphysicalproperties.关键矿物的成岩演化还受到多种因素的控制，如沉积环境、成岩流体性质、温度压力条件等。通过对这些因素的综合分析，可以更深入地理解成岩演化对储层物性的控制作用。Thediageneticevolutionofkeymineralsisalsocontrolledbyvariousfactors,suchassedimentaryenvironment,diageneticfluidproperties,temperatureandpressureconditions,etc.Bycomprehensivelyanalyzingthesefactors,wecangainadeeperunderstandingofthecontrollingroleofdiageneticevolutiononreservoirproperties.通过对四川盆地东部某区块上奥陶统五峰组和下志留统龙马溪组页岩的实例分析，揭示了关键矿物成岩演化及其对储层物性的控制作用。这为页岩气勘探开发提供了重要的理论依据和实践指导。ThroughcaseanalysisoftheUpperOrdovicianWufengFormationandLowerSilurianLongmaxiFormationshaleinacertainblockintheeasternSichuanBasin,thediageneticevolutionofkeymineralsandtheircontroloverreservoirpropertieswererevealed.Thisprovidesimportanttheoreticalbasisandpracticalguidanceforshalegasexplorationanddevelopment.五、结论与建议Conclusionandrecommendations本研究通过对四川盆地上奥陶统五峰组—下志留统龙马溪组页岩的详细分析，揭示了关键矿物的成岩演化过程及其对储层物性的控制作用。研究发现，页岩中的矿物成分、成岩作用类型及其演化过程对储层物性具有显著影响。具体而言，页岩中硅质、钙质和粘土矿物的含量及分布特征控制了储层的孔隙度、渗透率和含气性。成岩作用类型如压实作用、胶结作用、溶蚀作用等在不同阶段对储层物性产生了不同的影响。压实作用和胶结作用常导致储层物性变差，而溶蚀作用则有助于改善储层物性。ThisstudyrevealsthediageneticevolutionprocessofkeymineralsandtheircontroloverreservoirpropertiesthroughadetailedanalysisofshalefromtheUpperOrdovicianWufengFormationtotheLowerSilurianLongmaxiFormationintheSichuanBasin.Researchhasfoundthatthemineralcomposition,diagenetictypes,andevolutionaryprocessesinshalehaveasignificantimpactonreservoirproperties.Specifically,thecontentanddistributioncharacteristicsofsiliceous,calcareous,andclaymineralsinshalecontroltheporosity,permeability,andgascontentofreservoirs.Thetypesofdiagenesis,suchascompaction,cementation,anddissolution,havedifferentimpactsonreservoirpropertiesatdifferentstages.Compactionandcementationoftenleadtodeteriorationofreservoirproperties,whiledissolutionhelpstoimprovereservoirproperties.在页岩气勘探开发过程中，应充分考虑关键矿物的成岩演化过程及其对储层物性的控制作用，以提高勘探开发效果。Intheprocessofshalegasexplorationanddevelopment,fullconsiderationshouldbegiventothediageneticevolu