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簡(jiǎn)介:(煤層氣完井一種世界的觀點(diǎn))1中文中文10700字出處出處PALMERICOALBEDMETHANECOMPLETIONSAWORLDVIEWJINTERNATIONALJOURNALOFCOALGEOLOGY,2010,823184195煤層氣完井一種世界的觀點(diǎn)IANPALMERHIGGSPALMERTECHNOLOGIES10140ARROYOCRESTDRIVENW,ALBUQUERQUE,NM,87114,USA摘要由于鉆進(jìn)深度通常較淺,因此煤層氣鉆井成本較為低廉。深度較大的鉆井通常會(huì)降低煤的滲透率以及開(kāi)采率。對(duì)于煤層氣開(kāi)發(fā)商來(lái)說(shuō),低滲透率是不利的因素(致命弱點(diǎn)),成功的開(kāi)采煤層氣需要尋找那些滲透性較強(qiáng)的地層,選擇利用煤層氣水平壓裂鉆井,以及有可能通過(guò)“新范式”的方法,如剪切破碎和儲(chǔ)層壓裂來(lái)“創(chuàng)造”滲透性。本文主要討論了滲透率在選擇完井工藝中的影響和世界范圍內(nèi)一些完井工藝的例子。提供的指導(dǎo)方針都是新型的,實(shí)用的(包括滲透帶和決策樹(shù)),而且應(yīng)該是對(duì)任何煤層氣鉆井的完井方法都是有益的。關(guān)鍵詞煤層氣;滲透率;完井方式;斷裂;產(chǎn)量1引言和常規(guī)砂巖井不同,由于還沒(méi)有太多的共識(shí),煤層氣的完井和增產(chǎn)一般選擇反復(fù)試驗(yàn)的方法。這方面的一個(gè)很好的例子是在澳大利亞煤層氣完井和增產(chǎn)(KUBENK,2006)中形成的。然而,這是一種成本較高的方法。此外,滲透率在煤層氣可采性和完井中的作用并沒(méi)有得到充分的認(rèn)識(shí)(PALMER,2008)?,F(xiàn)在,經(jīng)過(guò)美國(guó)30多年的煤層氣生產(chǎn),已經(jīng)有了煤層氣的普遍性生產(chǎn)原則和決策樹(shù),它們指導(dǎo)開(kāi)采商選擇完井,這也是本文的主題所在。本文闡述了滲透性在煤層氣成功完井中的至關(guān)重要性。有關(guān)不同煤層氣完井的評(píng)論已經(jīng)發(fā)表,但這些論述主要是集中針對(duì)特定的盆地或地區(qū)的(HOLDITCH,1990;CRAMERON,1992;PALMERETAL,1993,1995;ROBINSONANDHOLDITCH,1999)。有篇論文是尋索煤層氣生產(chǎn)趨勢(shì)(跨流域)以及建立儲(chǔ)集層和完井參數(shù)PALMERANDCAMERON,2003的函數(shù)關(guān)系,雖然在本文中揭示了不同的(煤層氣完井一種世界的觀點(diǎn))3近乎直線式增長(zhǎng),儲(chǔ)量和產(chǎn)量幾乎相當(dāng)于美國(guó)天然氣總產(chǎn)值的10,這是一個(gè)相當(dāng)顯著的臨界值。最近的一項(xiàng)估計(jì)數(shù)據(jù)表明,目前美國(guó)大約有90000口煤層氣井。圖1美國(guó)煤層氣資源分布(COURTESYOFANDREWSCOTT,ALTUDA,SANANTONIO,TEXAS)澳大利亞有很多易于開(kāi)采的煤炭,火力發(fā)電使得油氣價(jià)格被人為地壓低,這讓它仍很難與煤層氣的價(jià)格競(jìng)爭(zhēng)(PALMER,2008)。不過(guò),當(dāng)?shù)氐闹饕簩託夤疽押喜?,并宣布了幾?xiàng)LNG工廠建設(shè)計(jì)劃(銷(xiāo)售到日本等等),這也提高了煤層氣的價(jià)格。有些地區(qū)其滲透性可達(dá)幾百M(fèi)D,而最大的井產(chǎn)量約為12MMCFD。在尋求最優(yōu)價(jià)格完井方面,開(kāi)釆商一直未拿定主意(KUBENK,2006),從簡(jiǎn)單的裸眼完井,洞穴完井,水力壓裂,射孔以及包括水平井壓裂裂縫(兩井呈“人”字形模式)在內(nèi)的各種完井方式之間不斷變化。在加拿大,商業(yè)煤層氣項(xiàng)目均在加拿大西部沉積盆地中(WCSB),其中最大的煤層氣項(xiàng)目位于ALBERTA省的馬蹄峽谷,那里有成千上萬(wàn)口井。該項(xiàng)目于幾年前開(kāi)始,從滲透率01100MD的三十處相互獨(dú)立的地裂縫生產(chǎn)出煤層氣。雖然更多的資源在加拿大西部沉積盆地的MANNVILLE地區(qū)形成,但這些地區(qū)煤的滲透率通常只有1MD,除了某些“甜點(diǎn)”處的水平井能夠開(kāi)采煤層氣外,其他地方難以生產(chǎn)。中國(guó)煤炭?jī)?chǔ)量十分豐富,煤層氣含量總的來(lái)說(shuō)也比較高。但是,滲透率通
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簡(jiǎn)介:COALBEDMETHANECOMPLETIONSAWORLDVIEWIANPALMERHIGGSPALMERTECHNOLOGIES,10140ARROYOCRESTDRIVENW,ALBUQUERQUE,NM,87114,USAABSTRACTARTICLEINFOARTICLEHISTORYRECEIVED1JULY2009RECEIVEDINREVISEDFORM23DECEMBER2009ACCEPTED24DECEMBER2009AVAILABLEONLINE7JANUARY2010KEYWORDSCOALBEDMETHANEPERMEABILITYWELLCOMPLETIONSSTIMULATIONPRODUCTIONCBMWELLSARECHEAPBECAUSETHEYAREUSUALLYSHALLOWDEEPERWELLSTENDTOHAVELOWERCOALPERMEABILITYANDPRODUCTIVITYLOWPERMEABILITYISTHEWEAKPOINTACHILLESHEELFORCBMVENTURES,ANDSUCCESSWILLENTAILFINDINGREGIONSOFENHANCEDPERMEABILITY,UTILIZINGHORIZONTALWELLSWITHTHEOPTIONOFFRACTURINGTHESEWELLS,ANDPOSSIBLYIN“CREATING”P(pán)ERMEABILITYBYNEWPARADIGMMETHODSSUCHASSHEARSTIMULATIONANDBRANCHFRACTURINGTHISPAPERDISCUSSESTHEROLEOFPERMEABILITYINCHOOSINGCBMCOMPLETIONS,ASWELLASEXAMPLESOFTHOSECOMPLETIONSFROMAROUNDTHEWORLDTHEGUIDELINESOFFEREDARENEWANDPRACTICALINCLUDINGPERMBANDSANDADECISIONTREE,ANDSHOULDBENEFITANYCBMCOMPLETIONSTRATEGY?2010ELSEVIERBVALLRIGHTSRESERVED1INTRODUCTIONWELLCOMPLETIONSANDSTIMULATIONSFORCOALBEDMETHANECBMHAVEGENERALLYBEENCHOSENBYTRIALANDERROR,BECAUSETHEREHASNOTBEENMUCHCONSENSUS,UNLIKEWELLSINCONVENTIONALSANDSTONEAGOODEXAMPLEOFTHISISTHEDEVELOPMENTOFCBMWELLCOMPLETIONSANDSTIMULATIONSINAUSTRALIAKUBENK,2006HOWEVER,THISISANEXPENSIVEAPPROACHFURTHER,THEROLEOFPERMEABILITYINCBMSUCCESSANDINCBMCOMPLETIONSHASNOTBEENFULLYAPPRECIATEDPALMER,2008NOW,AFTEROVER30YEARSOFCBMPRODUCTIONINTHEUSA,GENERALPRINCIPLESANDDECISIONTREESHAVEEMERGEDTOGUIDEANOPERATORINCHOOSINGAWELLCOMPLETIONTHISISTHESUBJECTOFTHISPAPERTHEPAPERILLUSTRATESTHECENTRALIMPORTANCEOFPERMEABILITYINTHESUCCESSOFCBMCOMPLETIONSREVIEWSHAVEBEENPUBLISHEDONDIFFERENTCBMCOMPLETIONS,BUTTHESEAREMAINLYFOCUSEDONPARTICULARBASINSORPLAYSHOLDITCH,1990CRAMER,1992PALMERETAL,1993,1995ROBINSONANDHOLDITCH,1999ONEPAPERHASSEARCHEDFORTRENDSINCBMPRODUCTIONACROSSBASINSASAFUNCTIONOFRESERVOIRANDCOMPLETIONPARAMETERSPALMERANDCAMERON,2003ALTHOUGHDIFFERINGINDUSTRYVIEWPOINTSAREREVEALEDINTHISPAPER,THEREISNOTMUCHCONSENSUSGEOLOGICALPREDICTIONSOFPERMEABILITYHAVENOTBEENDISCUSSED,BECAUSETHISISALARGEANDSOMETIMESCONTROVERSIALSUBJECTWHICHISBEYONDTHESCOPEOFTHISPAPERFURTHER,PREDICTIONSBASEDONGEOLOGYAREMOREQUALITATIVETHANQUANTITATIVE,WHEREASTHISPAPERFOCUSESONQUANTITATIVEMEASUREMENTOFPERMEABILITYTHEINTENTIONISNOTTOBERIGOROUS,BECAUSETHATWOULDREQUIREPRESENTINGANANALYSISOF30YEARSOFCBMDATAFROMTHEUSA,ASWELLASDATAFROMOTHERCOUNTRIESWHERECBMISNOWEXPLOITEDINPLACEOFTHIS,THEREADERMAYREFERTOTHEREFERENCESABOVEALLREVIEWARTICLES,ANDPARTICULARLYTHATOFPALMERANDCAMERON2003EFFECTIVESTRESSHASANEFFECTONCOALPERMEABILITYHOWEVER,INTHISPAPERTHEPRINCIPALMESSAGEISTOMEASURETHECOALPERMEABILITYINAPROSPECTIVECBMPLAY,ANDCHOOSETHEWELLCOMPLETIONACCORDINGLYTHEPOTENTIALEFFECTOFSTRESSANDDEPTHONPERMEABILITYISNOTNEEDEDIFONEMEASURESTHEPERMEABILITYAFTERABACKGROUNDOFCBMPRODUCTIONWORLDWIDE,THEPAPERDISCUSSESTHEROLEOFPERMEABILITYINCHOOSINGCBMCOMPLETIONS,ASWELLASEXAMPLESOFTHOSECOMPLETIONSWEDEFINEPERMBANDSASRANGESOFCOALPERMEABILITYINWHICHCERTAINWELLCOMPLETIONTYPESAREPREFERREDATANOTHERLEVEL,THISAPPROACHLEADSTOADECISIONTREEWHICHINCLUDESVARIOUSCOMPLETIONOPTIONSASAFUNCTIONOFTHECOALPERMEABILITYTHISAPPROACHISNEWANDPRACTICAL,ANDSHOULDBENEFITANYCBMCOMPLETIONSTRATEGY2WORLDWIDEBACKGROUNDCOALBEDMETHANECBMHASBECOMEARESOURCEOFGLOBALSIGNIFICANCE,WITHTHEEMERGENCEOFACTIVECBMPLAYSINCANADA,AUSTRALIA,INDIA,ANDCHINA,FOREXAMPLEPALMER,2008ATTHEOTHERENDOFTHESPECTRUM,COUNTRIESLIKEENGLAND,FRANCE,TURKEY,ANDCOLOMBIAHAVEMUCHSMALLERRESOURCES,ANDSOFARHAVENOTBEENABLETOGETACBMINDUSTRYSTARTED,THOUGHTHEYAREACTIVELYTRYINGTHEATTRACTIONISUSUALLYGOODGASCONTENTANDCOALTHICKNESS,BUTTHEROADBLOCKISOFTENPOORPERMEABILITYLESSTHAN1MD,ANDTHISISCRITICALFORPROJECTECONOMICSINTHEUS,BPANDCONOCOPHILLIPSARETWOOFTHEBIGGESTCBMPRODUCERSINTHESANJUANBASINSEEFIG1,WHEREBPHASOVER1500WELLS,WHILECONOCOPHILLIPSHASOVER800PRODUCINGWELLSPALMER,INTERNATIONALJOURNALOFCOALGEOLOGY822010184–195EMAILADDRESSIANHIGGSPALMERCOM01665162/–SEEFRONTMATTER?2010ELSEVIERBVALLRIGHTSRESERVEDDOI101016/JCOAL200912010CONTENTSLISTSAVAILABLEATSCIENCEDIRECTINTERNATIONALJOURNALOFCOALGEOLOGYJOURNALHOMEPAGEWWWELSEVIERCOM/LOCATE/IJCOALGEOTOPRODUCEECONOMICGASFROMLOWPERMCOALSREQUIRESATHREEPRONGEDSTRATEGYPALMER,20081LOCATEASWEETSPOTBYUSINGSTRUCTURALGEOLOGYTOPREDICTWHERETOFINDONE,ORBYDRILLINGALOTOFWELLSUNTILYOUENCOUNTERONE,2DRILLHORIZONTALWELLS,AND3DEPLOYNOVELSTIMULATIONTECHNIQUESANEXAMPLEOFTHEFIRSTSTRATEGYISTHEAUSTRALIANCBMPLAYONTHEUNDULLANOSE,WHICHISTHE“FAIRWAY”O(jiān)FTHESURATBASIN,WITHPERMEABILITIESUPTO500MDSCOTTETAL,2004THEUNDULLANOSEISASTRUCTURALHIGH,ANDTHECOALMEASURESAREDRAPEDACROSSTHENOSETHISDRAPINGCAUSEDCLEATSANDFRACTURESTODEVELOPDURINGCOALIFICATIONSTRATEGIES2AND3WILLBEDISCUSSEDBELOWANASSIGNMENTOFCBMCOMPLETIONSBASEDONPERMEABILITYISSHOWNINFIG2WEWILLELABORATEMOREONTHISRANKINGSHORTLYBUTFIRST,TOFOLLOWTHISPERMBASEDCOMPLETIONSTRATEGYREQUIRESAFULLPERMEABILITYPICTUREOFTHEPROSPECTIVERESERVOIRTHISMEANSPERFORMINGLOTSOFPERMEABILITYMEASUREMENTSBOTHAREALLY~50MEASUREMENTSDESIRABLEACROSSTHECBMPLAYANDWITHINDIFFERENTSEAMSTHISCANBEEXPENSIVE,BUTISIMPORTANTTOOPTIMIZ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簡(jiǎn)介:FROMTHEWORLDOFRADIOINTHEWORLDTOASINGLECHIPMODERNCOMPUTERTECHNOLOGY,INDUSTRIALREVOLUTION,THEWORLDECONOMYFROMTHECAPITALINTOTHEECONOMYTOKNOWLEDGEECONOMYFIELDINTHEELECTRONICWORLD,FROMTHE20THCENTURYINTOTHEERAOFRADIOTOCOMPUTERTECHNOLOGYINTHE21STCENTURYASTHECENTEROFTHEINTELLIGENTMODERNERAOFELECTRONICSYSTEMSTHEBASICCOREOFMODERNELECTRONICSYSTEMSAREEMBEDDEDCOMPUTERSYSTEMSREFERREDTOASEMBEDDEDSYSTEMS,WHILETHEMICROCONTROLLERISTHEMOSTTYPICALANDMOSTEXTENSIVEANDMOSTPOPULAREMBEDDEDSYSTEMSFIRST,RADIOHASCREATEDGENERATIONSOFEXCELLENCEINTHEWORLDFIFTIESANDSIXTIESINTHE20THCENTURY,THEMOSTREPRESENTATIVEOFTHEADVANCEDELECTRONICTECHNOLOGYISWIRELESSTECHNOLOGY,INCLUDINGRADIOBROADCASTING,RADIO,WIRELESSCOMMUNICATIONSTELEGRAPH,AMATEURRADIO,RADIOPOSITIONING,NAVIGATIONANDOTHERTELEMETRY,REMOTECONTROL,REMOTETECHNOLOGYEARLYTHATTHESEELECTRONICTECHNOLOGYLEDMANYYOUNGPEOPLEINTOTHEWONDERFULDIGITALWORLD,RADIOSHOWWASAWONDERFULLIFE,THEPROSPECTSFORSCIENCEANDTECHNOLOGYELECTRONICSBEGANTOFORMANEWDISCIPLINERADIOELECTRONICS,WIRELESSCOMMUNICATIONSBEGANEWORLDJOURNEYRADIOTECHNOLOGYNOTONLYASAREPRESENTATIVEOFADVANCEDSCIENCEANDTECHNOLOGYATTHATTIME,BUTALSOFROMPOPULARTOPROFESSIONALFIELDSOFSCIENCE,ATTRACTINGTHEYOUNGPEOPLEANDENABLETHEMTOFINDALOTOFFUNOREFROMTHEBEDSIDETOTHESUPERHETERODYNERADIORADIOREPORTISSUEDFROMTHERADIOAMATEURRADIOSTATIONSFROMTHETELEPHONE,ELECTRICBELLTOTHERADIOCONTROLMODELBECAMEPOPULARYOUTHRADIOTECHNOLOGY,SCIENCEANDTECHNOLOGYEDUCATIONISTHEMOSTPOPULARANDMOSTEXTENSIVECONTENTSOFAR,MANYOFTHEOLDERGENERATIONOFENGINEERS,EXPERTS,PROFESSOROFTHEYEARARERADIOENTHUSIASTSFUNRADIOTECHNOLOGY,RADIOTECHNOLOGY,COMPREHENSIVETRAINING,FROMBASICPRINCIPLESOFELECTRONICS,ELECTRONICCOMPONENTSTOTHERADIOBASEDREMOTECONTROL,TELEMETRY,REMOTEELECTRONICSYSTEMS,HASTRAINEDSEVERALGENERATIONSOFTECHNOLOGICALEXCELLENCESECOND,FROMTHEPOPULARITYOFTHERADIOERATOERAOFELECTRONICTECHNOLOGYTHEEARLYRADIOTECHNOLOGYTOPROMOTETHEDEVELOPMENTOFELECTRONICTECHNOLOGY,MOSTNOTABLYELECTRONICVACUUMTUBETECHNOLOGYTOSEMICONDUCTORELECTRONICCIRCUITOTHERTHANTHESHRINKINGOFELECTRONICTECHNOLOGY,ELECTRONICTECHNOLOGYISNOTTHEOLDDAYSOFRADIOFUNTIMESANDCOMPREHENSIVEENGINEERINGTRAININGTHIRD,FROMTHECLASSICERAOFELECTRONICTECHNOLOGYTOMODERNELECTRONICTECHNOLOGYOFTHETIMES80YEARSINTOTHE20THCENTURY,THECENTURYOFECONOMICCHANGEISTHEMOSTIMPORTANTREVOLUTIONINTHECOMPUTERTHECOMPUTERREVOLUTIONINTHEMOSTIMPORTANTSIGNISTHEBIRTHOFTHECOMPUTEREMBEDDEDAPPLICATIONSMODERNCOMPUTERNUMERICALREQUIREMENTSSHOULDBEBORNALONGPERIODOFTIME,ISTODEVELOPTHEMASSIVECOMPUTERNUMERICALDUTYBUTTHECOMPUTERSHOWSTHELOGICOPERATION,PROCESSING,CONTROL,ATTRACTINGEXPERTSINTHEFIELDOFELECTRONICCONTROL,THEYWANTDEVELOPMENTTOMEETTHECONTROLOBJECTREQUIREMENTSOFEMBEDDEDAPPLICATIONS,COMPUTERSYSTEMSIFYOUMEETTHEMASSIVEDATAPROCESSINGCOMPUTERSYSTEMKNOWNASGENERALPURPOSECOMPUTERSYSTEM,THENTHESYSTEMCANBETHEEMBEDDEDOBJECTSUCHASSHIPS,AIRCRAFT,MOTORCYCLES,ETCINACOMPUTERSYSTEMCALLEDTHEEMBEDDEDCOMPUTERCLEARLY,BOTHTHEDIRECTIONOFTECHNOLOGYDEVELOPMENTAREDIFFERENTTHEFORMERREQUIRESMASSIVEDATASTORAGE,HANDLING,PROCESSINGANDANALYSISOFHIGHSPEEDDATATRANSMISSIONWHILETHELATTERREQUIRESRELIABLEOPERATIONINTHETARGETENVIRONMENT,THEEXTERNALPHYSICALPARAMETERSONHIGHSPEEDACQUISITION,ANALYSISANDPROCESSINGLOGICANDTHERAPIDCONTROLOFEXTERNALOBJECTSITWILLADDANEARLYGENERALPURPOSECOMPUTERDATAACQUISITIONUNIT,THEOUTPUTDRIVERCIRCUITRELUCTANCETOFORMAHEATTREATMENTFURNACETEMPERATURECONTROLSYSTEMTHISGENERALPURPOSECOMPUTERSYSTEMISNOTPOSSIBLEFORMOSTOFTHEELECTRONICSYSTEMUSED,ANDTOMAKEGENERALPURPOSECOMPUTERSYSTEMMEETSTHEREQUIREMENTSOFEMBEDDEDAPPLICATIONS,WILLINEVITABLYAFFECTTHEDEVELOPMENTOFHIGHSPEEDNUMERICPROCESSINGINORDERTOSOLVETHECONTRADICTIONBETWEENTHEDEVELOPMENTOFCOMPUTERTECHNOLOGY,INTHE20THCENTURY70S,SEMICONDUCTOREXPERTSANOTHERWAY,INFULLACCORDANCEWITHTHEELECTRONICSYSTEMEMBEDDEDCOMPUTERAPPLICATIONREQUIREMENTS,AMICROCOMPUTERSBASICSYSTEMONACHIP,THEFORMATIONOFTHEEARLYSCMSINGLECHIPMICROCOMPUTERAFTERTHEADVENTOFSINGLECHIPINTHECOMPUTERINDUSTRYBEGANTOAPPEARINTHEGENERALPURPOSECOMPUTERSYSTEMSANDEMBEDDEDSYSTEMSTHETWOBRANCHESSINCETHEN,BOTHTHEEMBEDDEDSYSTEM,ORGENERALPURPOSECOMPUTERSYSTEMSHAVEBEENDEVELOPEDRAPIDLY
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簡(jiǎn)介:字?jǐn)?shù)英文字?jǐn)?shù)英文31723172單詞,單詞,1849718497字符;中文字符;中文57585758漢字漢字出處出處ROKVENROKVENJJ,J,WEIJTERSWEIJTERSG,G,BEERTHUIZENBEERTHUIZENMGCJ,J,ETETALALJUVENILEJUVENILEDELINQUENCYDELINQUENCYININTHETHEVIRTUALVIRTUALWORLDWORLDSIMILARITIESSIMILARITIESANDANDDIFFERENCESDIFFERENCESBETWEENBETWEENCYBERENABLED,CYBERENABLED,CYBERDEPENDENTCYBERDEPENDENTANDANDOFFLINEOFFLINEDELINQUENTSDELINQUENTSININTHETHENETHERLANDSJNETHERLANDSJINTERNATIONALINTERNATIONALJOURNALJOURNALOFOFCYBERCYBERCRIMINOLOGY,CRIMINOLOGY,2018121274620181212746外文文獻(xiàn)外文文獻(xiàn)JUVENILEDELINQUENCYINTHEVIRTUALWORLDSIMILARITIESANDDIFFERENCESBETWEENCYBERENABLED,CYBERDEPENDENTANDOFFLINEDELINQUENTSINTHENETHERLANDSABSTRACTTHISSTUDYEXAMINESSIMILARITIESANDDIFFERENCESBETWEENJUVENILEDELINQUENTSOFSELFREPORTEDCYBERENABLEDOFFENSES,CYBERDEPENDENTOFFENSES,ANDOFFLINEOFFENSESTHESTUDYBUILDSONPASTSTUDIESBYEXAMININGABROADRANGEOFONLINEANDOFFLINEOFFENSESAMONGANATIONALPROBABILITYSAMPLEOFDUTCHJUVENILESAGED1217YEARSOLDRESULTSSHOWTHATJUVENILESWHOREPORTBOTHOFFLINEANDONLINEOFFENSESHAVETHEMOSTHIGHRISKPROFILEWITHINTHEGROUPONLINEDELINQUENTS,JUVENILESWHOCOMMITBOTHCYBERDEPENDENTANDCYBERENABLEDOFFENSESHAVETHEHIGHESTRISKPROFILETHERESULTSFURTHERINDICATETHATCYBERDEPENDENTDELINQUENTSAREADISTINCTGROUPFROMONLINEDELINQUENTSKEYWORDSONLINEOFFENDING,CYBERCRIME,CYBERDEPENDENTCRIME,CYBERENABLEDCRIME,RISKANDPROMOTIVEFACTORSINTRODUCTIONSINCE2007POLICECENSUSDATAHAVESHOWNASHARPDECLINEINJUVENILECRIMEIN2009YAR,2005ATOTHEBESTOFOURKNOWLEDGE,ONLYONESTUDYHASFOCUSEDONABROADERRANGEOFONLINEOFFENSES,WHILSTALSOINCLUDINGOFFLINEOFFENSESDONNER,JENNINGSBANFIELD,2015DONNERANDCOLLEAGUESFOUNDTHATONLINEDELINQUENTSWEREOFTENPRONETOOFFLINEDELINQUENCYASWELLHOWEVER,THESEFINDINGSAREBASEDONASAMPLEFROMASPECIFICPOPULATION,NAMELYUNDERGRADUATECOLLEGESTUDENTSINTHEUSTHEQUESTIONISWHETHERTHEIRRESULTSCANBEGENERALIZEDTOANATIONALPROBABILITYSAMPLEOFJUVENILESINTHECURRENTSTUDY,WEBUILDONPREVIOUSRESEARCHBYFIRSTINVESTIGATINGTHEEXTENTTOWHICHCYBERENABLEDANDCYBERDEPENDENTDELINQUENTSDIFFERFROMEACHOTHER,ANDSECONDLYTHEEXTENTTOWHICHTHEYDIFFERFROMOFFLINEDELINQUENTSSTUDYINGTYPESOFONLINEDELINQUENTSANDTHEIRSIMILARITIESANDDIFFERENCESWITHTRADITIONALOFFLINEDELINQUENTSISIMPORTANT,BECAUSEIFONLINEDELINQUENTSARESIMILARTOOFFLINEDELINQUENTS,THESAMEPREVENTIONMETHODSCOULDBEUSEDFORBOTHHOWEVER,IFDIFFERENCESEMERGEWITHINANDBETWEENGROUPS,DIFFERENTAPPROACHESREGARDINGPREVENTIONANDFORENSICTREATMENTMAYBEREQUIREDTOSTUDYPOTENTIALDIFFERENCESBETWEENCYBERENABLED,CYBERDEPENDENT,ANDOFFLINEDELINQUENTS,WEUSEDTHEYOUTHDELINQUENCYSURVEYYDS,ACROSSSECTIONALSELFREPORTEDSTUDYONANATIONALPROBABILITYSAMPLEOFJUVENILESFROMTHENETHERLANDSSEEVANDERLAAN,BLOMKLEEMANS,2009THEYDSCONTAINSDETAILEDINFORMATIONONBOTHSELFREPORTEDONLINEANDOFFLINEDELINQUENCY,ANDONRISKANDPROMOTIVEFACTORSTHATARERELATEDTOTRADITIONALOFFLINEDELINQUENCYRISKFACTORSINCREASETHELIKELIHOODOFDELINQUENCY,WHEREASPROMOTIVEFACTORSDECREASETHISLIKELIHOODDETERMININGTHEDIFFERENCESBETWEENCYBERENABLEDANDCYBERDEPENDENTDELINQUENTS,ANDDETERMININGTHEEXTENTTOWHICHONLINEDELINQUENTSDIFFERFROMOFFLINEDELINQUENTS,ISDONEBYEXAMININGTHESERISKANDPROMOTIVEFACTORSTHEMAINRESEARCHQUESTIONSOFTHISSTUDYAREWHATDISTINGUISHESJUVENILEDELINQUENTSOFCYBERENABLEDOFFENSESFROMJUVENILEDELINQUENTSOFCYBERDEPENDENTOFFENSESWHATDISTINGUISHESJUVENILEDELINQUENTSOFONLINEOFFENSESFROMJUVENILEDELINQUENTSOFOFFLINEOFFENSES
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