?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGGUNAAN+METODE+PRE+STACK+DEPTH+MIGRATION+VERTICAL%0D%0ATRANSVERSE+ISOTROPY+UNTUK+STUDI+PENCITRAAN+STRUKTUR%0D%0ABAWAH+PERMUKAAN&rft.creator=+AULIA+AHMAD+NAFIS%2C++1315051009&rft.subject=GB+Physical+geography&rft.subject=Teknologi+lingkungan+.+rekayasa+sanitasi&rft.description=PSDM+sering+digunakan+pada+daerah+dengan+setting+geologi+yang+kompleks+dan%0D%0Amemiliki+variasi+kecepatan+lateral+yang+cukup+kuat+sehingga+anomali+berupa%0D%0Amistacking+atau+seismik+sag+pada+daerah+fault+shadow+yang+dapat+menimbulkan%0D%0Akesalahan+interpretasi.+PSDM+mampu+mengatasi+fault+shadow+karena+model%0D%0Akecepatan+yang+digunakan+akan+lebih+akurat%2C+namun+akurasi+PSDM+sangat%0D%0Abergantung+pada+seberapa+tepat+dalam+mengestimasi+kecepatan.+Untuk+itu+dalam%0D%0Amembuat+estimasi+kecepatan+yang+akurat+maka+dibutuhkan+anisotropic+PSDM%0D%0Adimana+keadaan+bawah+permukaan+sebetulnya+tidaklah+isotropic+tetapi+cepat+rambat%0D%0Agelombang+akan+berbeda+berdasarkan+arahnya+(anisotropic).+Model+anisotropic+yang%0D%0Adigunakan+pada+penelitian+ini+adalah+Vertical+Transverse+Isotropy(VTI)+karena+model%0D%0Aini+mampu+menjelaskan+efek+anisotropic+secara+sederhana+pada+lapisan+sedimen.%0D%0ATahapan+pengolahan+data+dibagi+menjadi+dua+yaitu+PSDM+Isotropic+untuk%0D%0Amemflatkan+gather+pada+near+offset+(+angle+mute+%3C30+derajat)+dan+PSDM+Anisotropic%0D%0Auntuk+memflatkan+gather+pada+far+offset+(angle+mute+%3E30+derajat).+Kemudian%0D%0Abeberapa+parameter+yang+berpengaruh+untuk+mendapatkan+estimasi+kecepatan+yang%0D%0Atepat+seperti+estimasi+thomsen+parameter+(delta+dan+epsilon)%2C+CIP+Pick+(RMO)%2C+Dip%0D%0AEstimation%2C+dan+Tomografi.+Ketepatan+dalam+mengestimasi+model+kecepatan%0D%0Adikontrol+pula+oleh+flatness+gather+dan+Gamma+syintetic%2C+model+kecepatan+dinilai%0D%0Amemiliki+akurasi+yang+baik+sebab+gather+dinilai+sudah+flat+dan+gamma+synthetic%0D%0Amenunjukan+error+yang+kecil.+Setelah+dilakukan+beberapa+kali+iterasi+perbaikan+model%0D%0Akecepatan%2C+model+kecepatan+final+ini+digunakan+dalam+melakukan+depth+migration.%0D%0ADengan+hasil+dari+metode+PSDM+VTI+ini%2C+model+kecepatan+yang+dihasilkan+lebih%0D%0Amendekati+keadaan+yang+sebenarnya+dibandingkan+dengan+PSTM+dan+mampu%0D%0Amembuat+gather+menjadi+flat+sampai+far+offset+sehingga+mistacking+menjadi+teratasi%0D%0AKata+kunci%3A+PSDM%2C+VTI%2C+Anisotropic%2C+kecepatan%0D%0A%0D%0Aabstract%0D%0A%0D%0APSDM+is+often+used+in+areas+that+has+complex+geology+setting+and+strong+lateral%0D%0Avelocity+variations+so+that+make+an+anomaly+such+as+mistacking+or+seismic+sag+in%0D%0Afault+shadow+area%2C+this+anomaly+will+make+a+mistake+in+interpretation.+PSDM+is+able%0D%0Ato+solve+fault+shadow+because+the+velocity+model+which+is+used+in+this+method+will+be%0D%0Amore+accurate.+However+accuracy+of+PSDM+is+depends+on+how+accurate+we+estimate%0D%0Aof+the+velocity.+To+make+an+accurate+velocity+model+estimates%2C+an+anisotropic+PSDM%0D%0Ais+required+because+the+real+case+of+subsurface+is+not+only+Isotropic+but+also%0D%0AAnisotropic+(wave%E2%80%99s+propagation+depends+on+direction).+In+this+case+we+use+Vertical%0D%0ATransverse+Isotropy+(VTI)+model+for+Anisotropic+analysis+because+this+model+is+able%0D%0Ato+explain+the+anisotropic+effect+simply+on+the+sediment+layer.+The+data+processing+is%0D%0Adivided+into+two+parts+namely+isotropic+PSDM+to+flatten+near+offet+gather+(angle+mute%0D%0A%3C30+degree)+and+anisotropic+PSDM+to+flatten+far+offet+gather+(angle+mute+%3E30%0D%0Adegree).+Then+some+parameter+which+is+it+play+the+important+role+to+make+more%0D%0Aaccurate+velocity+estimation+are+Thomsen%E2%80%99s+parameter+(delta+and+epsilon)%2C+CIP+Pick%0D%0A(RMO)%2C+Dip+Estimation+and+Tomografi+(CIP+Diff+and+Ztomo).+The+accuracy+of+the%0D%0Avelocity+model+estimation+is+controlled+by+flatness+gather+and+gamma+synthetic.+The%0D%0Avelocity+has+a+good+accuracy+because+the+gather+is+flat+and+gamma+synthetic+shows%0D%0Amore+a+little+error%2C+after+that+the+final+velocity+model+is+used+for+depth+migration%0D%0Aprocess.+With+this+PSDM+VTI+method%2C+the+result+of+the+velocity+model+is+closer+to+the%0D%0Areal+condition+than+PSTM+and+able+to+flatten+the+gather+until+far+offset+so+that+the%0D%0Amistacking+can+be+resolved%0D%0AKeyword%3A+PSDM%2C+VTI%2C+Anisotropic%2C+Velocity&rft.publisher=+FAKULTAS+TEKNIK&rft.date=2017-08-29&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28694%2F1%2FABSTRACT%2520%2528ABSTRAK%2529.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28694%2F15%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28694%2F16%2FSKRIPSI%2520FULL.pdf&rft.identifier=+++AULIA+AHMAD+NAFIS%2C+1315051009++(2017)+PENGGUNAAN+METODE+PRE+STACK+DEPTH+MIGRATION+VERTICAL+TRANSVERSE+ISOTROPY+UNTUK+STUDI+PENCITRAAN+STRUKTUR+BAWAH+PERMUKAAN.+++FAKULTAS+TEKNIK%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F28694%2F