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1、西沙海槽研究区天然气水合物地球化学勘探及成藏模式研究1225432孙春岩,牛滨华,王宏语,赵克斌,吴能有,苏新,李佳1.中国地质大学工程技术学院,北京1000832.中国地质大学地球物理与信息技术学院,北京1000833.中国地质大学海洋学院,北京1000834.广州海洋地质调查局,广东广州5107605.中石化研究院化探中心,安徽合肥230022122SUNChun-yan,NIUBin-hua,WANGHong-yu,5432ZHAOKe-bin,WUNeng-you,SUXin,LIJia1.SchoolofEngineerin
2、g&Technology,ChinaUniversityofGeosciences,Beijing100083,China2.SchoolofGeophysics&InformationTechnology,ChinaUniversityofGeosciences,Beijing100083,China3.SchoolofOcean,ChinaUniversityofGeosciences,Beijing100083,China4.OceanGeologyInvestigationBureauofGuangzhou,Guangzhou
3、510760,China51InstituteofPetroleumGeochemicalProspecting(SINOPEC),Hefei230022,ChinaSUNChun-yan,NIUBin-hua,WANGHong-yu,etal.AstudyofgashydrategeochemicalexplorationanddepositformationpatternsintheXishaocean.EarthScienceFrontiers,2005,12(1):243-251Abstract:Thepaperrelieso
4、ntheacidolysishydrocarbonresultsofsamplesobtainedfromlegODP204,1250Csite.Wehaveanalyseddatafromseveralsitesandinvestigatedthepatternsofgashydratedepositsinthearea,andtheoriginofthegashydrate.Theresultsofthisresearchshowthatthegeochemicalanomaliesofgaseoushydrocarbonindi
5、catrixaremainlydistributedinthesouthernslopeoftheareastudied.ThisiscloselyrelatedtotheseismicBSRmarkerandtothedevelopmentoftheruptures;andthatthecauseofformationofsubma-rinesedimentarygaseoushydrocarbonmethaneintheXishaoceantroughismainlyascribedtopyrolysis.Wediscussthe
6、fault-filteringandcomprehensiveformationpatternofthegashydrate,whichreasonablyexplainstheinconsistencyoftheBSRzonewiththehighvalueanomalyzoneofseabedmethane,andpredictssomefa-vorableprospectingareas.Theresultsalsoprovidethegeochemicalevidencefortheexplorationofthegashy-
7、drate,andshedlightonthecauseofitsformation.Keywords:gashydrate;BSR;geochemicalanomaly;Xishaoceantrough;favorableprospectingarea;depositformationpattern摘要:依据ODP204航次1250C站位钻井样品酸解烃数据结果,以及作者在南海西沙海槽研究区天然气水合物地球化学现场勘查中得到的多种烃类指标数据、异常点上微量甲烷碳同位素数值等资料,对海洋水合物地球化学勘探的依据和研究区气态烃异常特征、气
8、体成因、天然气水合物成藏模式等相关问题进行了研究探讨。结果表明:气态烃指标地球化学异常主要分布在工区北部斜坡地带,并与BSR等地震标志及深部断裂关收稿日期:2004123;修回日期:20041217基金项目:国家/863
