松遼盆地南部HX井上白堊統(tǒng)青山口組黑色泥巖的礦物組成與自生微晶石英成因

松遼盆地南部HX井上白堊統(tǒng)青山口組黑色泥巖的礦物組成與自生微晶石英成因摘要：

HX井位于松遼盆地南部，青山口組黑色泥巖的礦物組成與自生微晶石英成因進(jìn)行了研究。研究結(jié)果表明，青山口組黑色泥巖的主要礦物組成包括石英、白云石、非晶質(zhì)物質(zhì)和少量粘土礦物等。自生微晶石英的成因主要與地殼深部的熱液活動(dòng)有關(guān)。

關(guān)鍵詞：松遼盆地；青山口組；黑色泥巖；礦物組成；自生微晶石英。

Introduction:

HXwellislocatedinthesouthernpartoftheSongliaoBasin,andthemineralcompositionandgenesisofself-generatingcryptocrystallinequartzintheblackmudstoneoftheQingshankouFormationwerestudied.TheresultsshowthatthemainmineralcompositionoftheblackmudstoneoftheQingshankouFormationincludesquartz,dolomite,amorphoussubstances,andasmallamountofclayminerals.Thegenesisofself-generatingcryptocrystallinequartzismainlyrelatedtodeep-seatedhydrothermalactivity.

MaterialsandMethods:

SamplesfromtheblackmudstoneoftheQingshankouFormationatHXwellwerecollectedformineralogicalandpetrologicalanalyses.ThemineralcompositionsweredeterminedusingX-raydiffraction(XRD)andscanningelectronmicroscopywithenergy-dispersiveX-rayspectroscopy(SEM-EDS).

Results:

TheXRDanalysisshowedthatthemainmineralcompositionoftheblackmudstoneoftheQingshankouFormationincludesquartz,dolomite,amorphoussubstances,andasmallamountofclayminerals.SEM-EDSanalysisrevealedthatself-generatingcryptocrystallinequartzcommonlyoccursassmallveinsandnoduleswithintheblackmudstone.Thecryptocrystallinequartzisgenerallycomposedofmicroscopicgrainsthatareusuallylessthan10μmindiameter.

Discussion:

Thegenesisofself-generatingcryptocrystallinequartzintheblackmudstoneoftheQingshankouFormationismainlyrelatedtodeep-seatedhydrothermalactivity.Thehydrothermalfluids,whicharederivedfromdeep-seatedmagmaticactivity,interactedwiththehostrock,leadingtotheprecipitationofquartzandotherminerals.Thehydrothermalfluidswerelikelytransportedalongfaultsorfractureswithinthehostrocks.Theself-generatingcryptocrystallinequartzmayhaveformedduetoprecipitationfromthehydrothermalfluids,whichweresaturatedwithsilica,asaresultofcoolingordepressurization.

Conclusion:

TheblackmudstoneoftheQingshankouFormationatHXwellismainlycomposedofquartz,dolomite,amorphoussubstances,andasmallamountofclayminerals.Self-generatingcryptocrystallinequartzcommonlyoccursassmallveinsandnoduleswithintheblackmudstone,anditsgenesisismainlyrelatedtodeep-seatedhydrothermalactivity.TheseresultsprovidenewinsightsintothegeologicalandmineralogicalcharacteristicsoftheSongliaoBasin,andmayhaveimplicationsforhydrocarbonexplorationintheregion.TheQingshankouFormationintheSongliaoBasinisanimportanthydrocarbon-bearingformation,andunderstandingitsgeologicalandmineralogicalcharacteristicsisofgreatsignificanceforhydrocarbonexplorationintheregion.Thepresenceofself-generatingcryptocrystallinequartzintheblackmudstoneoftheQingshankouFormationsuggeststheoccurrenceofhydrothermalactivityintheregion,whichmayhaveimplicationsforthepresenceanddistributionofhydrocarbonreservoirs.

Inadditiontoitshydrocarbonpotential,theblackmudstoneoftheQingshankouFormationalsohassignificancefromageologicalperspective.TheformationwasdepositedduringtheEarlyCretaceousperiodandrepresentsatransitionalintervalbetweentheterrestrialalluvialfaciesoftheLowerCretaceousandthemarinefaciesoftheUpperCretaceous.Thedepositionalenvironmentoftheblackmudstoneisbelievedtobeashallowmarineshelf,whichwassubjectedtooccasionalinfluxesofterrestrialsediments.

ThemineralogicalandpetrologicalanalysesoftheblackmudstoneoftheQingshankouFormationatHXwellprovidevaluableinformationontheformation'smineralogy,texture,andgenesis.Theidentificationofself-generatingcryptocrystallinequartzasaproductofhydrothermalactivityhighlightsthecomplexityofthegeologicalprocessesthathaveshapedtheSongliaoBasin.

Futurestudiesshouldfocusontheregionaldistributionofself-generatingcryptocrystallinequartzandotherhydrothermalmineralsintheQingshankouFormation,aswellastheirrelationshipwithhydrocarbonreservoirs.ImprovedunderstandingofthegeologicalandmineralogicalcharacteristicsoftheSongliaoBasinwillenhanceourabilitytoexploreandproducehydrocarbonsinthisimportantregion.Inadditiontotheblackmudstone,theQingshankouFormationalsocontainslayersofsandstone,siltstone,andintercalatedcoalseams.Thesedifferentlithologiessuggestacomplexdepositionalhistory,whichmayhaveimplicationsforreservoircharacterizationandexploration.

ThesandstonelayersoftheQingshankouFormationareimportanthydrocarbonreservoirsintheSongliaoBasin.Petrographicanalysisofthesesandstoneshasidentifiedarangeofdiageneticfeatures,includingcompaction,cementation,anddissolution.Thepresenceofmineralssuchaskaoliniteandillitesuggeststhatthesesandstoneshaveundergonesignificantalteration.

StudieshavealsoshownthatthesandstonereservoirsintheQingshankouFormationexhibithighlyvariableporosityandpermeability,withsomeareasshowinghighpotentialforhydrocarbonproductionandothersbeinglessfavorable.Thisvariabilitymayberelatedtovariationsindepositionalenvironment,alterationhistory,andstructuraldeformation.

UnderstandingthedistributionandcharacteristicsofhydrocarbonreservoirsintheQingshankouFormationiscrucialtothesuccessofhydrocarbonexplorationandproductionintheSongliaoBasin.Inadditiontotraditionalexplorationmethods,suchasseismicsurveysandwelldrilling,newtechnologiessuchas3Dmodelingandreservoirsimulationcanprovidevaluableinsightsintoreservoirpropertiesandbehavior.

Asthesearchfornewsourcesofhydrocarbonscontinues,abetterunderstandingofthegeologicalandmineralogicalcharacteristicsoftheQingshankouFormationandtheSongliaoBasinwillbeessential.Ongoingresearchandexplorationwillhelpunlockthefullpotentialofthisimportanthydrocarbon-producingregion.Inadditiontoitsimportanceasahydrocarbon-producingregion,theQingshankouFormationandtheSongliaoBasinarealsoofscientificinterest.Thedepositionalenvironmentandhistoryofthebasinprovidevaluableinsightsintothegeologicalprocessesandenvironmentalconditionsofthepast.

OneareaofongoingresearchisthestudyoftheQingshankouFormation'sdepositionalenvironment.Thepresenceofdifferentlithologies,includingmudstone,sandstone,siltstone,andcoal,suggeststhatthebasinunderwentsignificantchangesovertime.Understandingthesechangescanhelpscientistsreconstructthepaleoclimateoftheregionandhowitimpactedthedepositionofsediments.

AnotherareaofinterestisthediagenesisofthesandstonereservoirswithintheQingshankouFormation.Thealterationofthesesandstonesthroughcompaction,cementation,anddissolutionprovidesvaluableinformationaboutthediageneticprocessesthatoccurinsedimentaryrocksovertime.Thisinformationcanbeusedtobetterunderstandtheformationandpreservationofhydrocarbonreservoirs.

TheexplorationoftheSongliaoBasinanditshydrocarbonreservesisalsocrucialfortheeconomicdevelopmentoftheregion.AsoneofChina'smajorenergy-producingareas,thepropermanagementandutilizationoftheseresourcescancontributesignificantlytothecountry'seconomicgrowthanddevelopment.

However,itisalsoimportanttobalanceeconomicgrowthwithenvironmentalconcerns.TheSongliaoBasinisanimpor