蘇里格東部地區(qū)奧陶系馬家溝組馬五5亞段成巖作用及其對(duì)儲(chǔ)層的影響摘要

蘇里格東部地區(qū)奧陶系馬家溝組馬五5亞段是該區(qū)最重要的油氣產(chǎn)層之一，該文通過實(shí)驗(yàn)室?guī)r相學(xué)特征、化學(xué)組成、儲(chǔ)層物性等方面的研究，從沉積環(huán)境、物質(zhì)來源和成巖作用等方面解析該區(qū)儲(chǔ)層的形成和演化過程。首先通過巖石學(xué)、化學(xué)和物理學(xué)等技術(shù)手段對(duì)該區(qū)塊碎屑巖進(jìn)行研究，證實(shí)了沉積環(huán)境的酸性沉積特征，但富含硅泥質(zhì)的支流物源的供給也拓展了變化的空間。其次通過SEM、XRD等分析手段研究發(fā)現(xiàn)，該區(qū)塊的沉積物具有強(qiáng)烈的成巖作用，較強(qiáng)的地震影響在這個(gè)過程中扮演了非常重要的角色，演化成了有機(jī)質(zhì)貢獻(xiàn)、水成氣礦、粘土礦物等特征，從而提高了儲(chǔ)層成巖程度、改善了儲(chǔ)層物性，提高了儲(chǔ)層厚度和孔隙度、滲透率等方面的儲(chǔ)層性質(zhì)，進(jìn)而影響了區(qū)域油氣勘探和開發(fā)效果。最后，基于本研究結(jié)果提出了對(duì)該區(qū)油氣勘探和開發(fā)的若干建議和措施。

關(guān)鍵詞:蘇里格東部地區(qū)；奧陶系馬家溝組；成巖作用；儲(chǔ)層性質(zhì)；油氣產(chǎn)層。

Abstract

TheMa5sub-sectionoftheDevonianMaJiagouFormationintheeasternSuligeareaisoneofthemostimportantoilandgasproducinghorizonsinthearea.Thispaperstudiestheformationandevolutionofthereservoirfromtheperspectivesofsedimentaryenvironment,materialsourceanddiagenesisthroughlaboratorystudiesoflithologicalcharacteristics,chemicalcompositionandreservoirphysicalproperties.Firstly,thesedimentarycharacteristicsofacidicsedimentationenvironmentandthesupplyofsilica-richtributarysourceprovidedfortheareawereconfirmedthroughthemethodsofpetrology,chemistryandphysics.Secondly,itwasfoundthatthesedimentaryrockoftheblockhadstrongdiagenesisthroughSEMandXRDanalysis,inwhichthestrongseismicimpactplayedaveryimportantrole,leadingtoorganicmattercontribution,water-generatedgasdeposits,claymineralsandotherfeatures.Thedegreeofdiagenesisofthereservoirwasimproved,andthereservoirpropertiessuchasthickness,porosityandpermeabilitywereimproved,whichinturnaffectedtheregionalexplorationanddevelopmentofoilandgas.Finally,basedontheresultsofthisstudy,severalsuggestionsandmeasuresforoilandgasexplorationanddevelopmentintheareawereproposed.

Keywords:EasternSuligearea;DevonianMaJiagouFormation;Diagenesis;Reservoirproperties;OilandgasproducinghorizonTheEasternSuligeareaisasignificantoilandgasproducingregioninChina,andtheDevonianMaJiagouFormationisanimportantoilandgasproducinghorizoninthearea.Thediageneticevolutionofthereservoirrocksplaysacrucialroleintheaccumulationandpreservationofhydrocarbonsinthisregion.

Basedontheanalysisofthinsections,XRD,SEMandporositymeasurements,thisstudyidentifiedvariousdiageneticprocessesthatoccurredintheMaJiagouFormation,suchascompaction,cementation,dissolution,andreplacement.Theseprocessesresultedinchangesinthereservoirproperties,suchasadecreaseinporosityandpermeabilityandanincreaseinthickness.

Thecompactionofthesedimentaryrocksledtothereductionoftheporespaceandanincreaseinthedensityofthereservoirrocks.Thecementationprocessresultedinthegrowthofmineralcrystalsintheporespaces,whichreducedtheporosityandpermeabilityoftherocks.Dissolutionofunstablemineralsresultedintheenlargementofporespacesandincreasedporosity.Thereplacementofunstablemineralsbymorestablemineralssuchascalciteandquartzalsoresultedinthemodificationofthereservoirproperties.

TheresultsofthisstudyprovidevaluableinsightsintohowthereservoirpropertiesoftheMaJiagouFormationhavebeenaffectedbydiagenesis.Theseinsightscanbeusedtoimproveregionalexplorationanddevelopmentofoilandgasresources.Toenhanceoilandgasproduction,furtherstudyisneededtoinvestigatetheheterogeneityofthereservoirrocksandtheirrelationshiptothediageneticprocesses.

Inconclusion,thediageneticprocessesintheDevonianMaJiagouFormationoftheEasternSuligeareaarecomplexanddiverse.TheevolutionofthereservoirpropertiesoftheMaJiagouFormationwasinfluencedbytheseprocesses,whichhasimportantimplicationsforoilandgasexplorationanddevelopmentintheregion.Toachieveoptimalproductivity,itisessentialtotakeintoaccounttheeffectsofdiageneticprocessesonreservoirpropertiesandtodevelopeffectivestrategiesforexplorationanddevelopmentTheMaJiagouFormationoftheEasternSuligeareaisknowntocontainasignificantamountofoilandgasreserves.However,theexplorationanddevelopmentofthesereservesischallengedbythecomplexdiageneticprocessesthathavetakenplaceinthisformation.Diagenesisreferstothephysical,chemical,andbiologicalchangesthatoccurinsedimentaryrocksaftertheyaredeposited.Thesechangescansignificantlyalterthephysicalandchemicalpropertiesoftherocks,affectingtheirporosity,permeability,andotherkeyreservoirparameters.

OneofthekeydiageneticprocessesthathasaffectedtheMaJiagouFormationiscompaction.Compactionoccursassedimentaryrocksareburiedundertheweightofoverlyingsediments.Thepressurefromtheweightoftheoverlyingrockscausesthesedimentaryparticlestopackmoretightlytogether,reducingtheporespacebetweenthem.Thisprocesscansignificantlyreducetheporosityandpermeabilityoftherock,affectingitsabilitytoholdandtransmitoilandgas.

AnotherdiageneticprocessthathasaffectedtheMaJiagouFormationiscementation.Cementationoccurswhenmineralsprecipitatefromfluidsflowingthroughtheporespacesoftherock,fillinginthegapsbetweenthesedimentaryparticles.Thisprocesscanalsoreducetheporosityandpermeabilityoftherock,makingitlesseffectiveasareservoirforoilandgas.

Inadditiontothesetwoprimarydiageneticprocesses,avarietyofotherprocessescanaffectthereservoirpropertiesoftheMaJiagouFormation.Theseincludefracturing,dissolution,andthegrowthofsecondaryminerals.Eachoftheseprocessescanhaveasignificantimpactontheporosity,permeability,andotherkeyreservoirpropertiesoftherock.

ToeffectivelyexploreanddeveloptheoilandgasreservesintheMaJiagouFormation,itisessentialtotakeintoaccountthecomplexdiageneticprocessesthathaveshapedtheformation.Thisrequiresadetailedunderstandingofthegeologicalhistoryoftheformation,aswellasthecurrentphysicalandchemicalpropertiesoftherock.Bycarefullycharacterizingthesepropertiesanddevelopingeffectiveexplorationanddevelopmentstrategies,itispossibletomaximizetheproductivityoftheMaJiagouFormationandunlockitsfullpotentialasasourceofoilandgasInadditiontogeologicalandphysicalproperties,itisalsoimportanttoconsidertheeconomicviabilityofdevelopingtheMaJiagouFormation.Economicfactorssuchasmarketdemand,productioncosts,andregulatoryrequirementsallplayacrucialroleindeterminingthefeasibilityandprofitabilityofoilandgasextraction.

Marketdemandforoilandgasissubjecttofrequentfluctuationsandcanbeunpredictable.Assuch,oilandgasproducersmustcarefullyanalyzemarkettrendsandprojectionstoensurethatthereissufficientdemandtojustifythecostsofproduction.Thismayinvolveconductingextensivemarketresearchorcollaboratingwithothercompaniestosharedataandresources.

ProductioncostsforextractingoilandgasfromtheMaJiagouFormationcanalsobesignificant,andwilldependonavarietyoffactorssuchasthedepthandlocationofthereserves,theavailabilityofinfrastructureandlabor,andthecomplexityoftheextractionprocessitself.Effectivecostmanagementstrategies,suchasoptimizingdrillingtechniquesandminimizingwasteordowntime,areessentialtomaintainingprofitability.

Regulatoryconsiderationsalsoplayacriticalroleinoilandgasdevelopment,withvaryinglocalandnationallawsandregulationsgoverningeverythingfromexplorationanddrillingtotransportationandprocessing.Companiesmusthaveathoroughunderstandingofallrelevantregulationsandensurethattheyarefullycompliant,asnon-compliancecanresultinsignificantfinancialpenalties,negativepublicity,andlegalliabilities.

Finally,environmentalandsocialconsiderationsmustalsobetakenintoaccountwhendevelopingtheMaJiagouFormationoranyothernaturalresource.Thismayincludemeasuressuchasminimizingemissionsandwaste,protectingwildlifehabitats,andengagingwithlocalcommunitiestoensurethattheirneedsandconcernsareaddressed.Bytakingaresponsibleandsustainableapproachtoresourcedevelopment,companiescanmaximizethei