KARAKTERISASI RESERVOAR KARBONAT MENGGUNAKAN EXTENDED ELASTIC IMPEDANCE DI LAPANGAN “VAN HALEN”



Sulistyo Oetomo Putro(1*)

(1) Geofisika Universitas Gadjah Mada
(*) Corresponding Author

Abstract


Metode inversi seismik dapat digunakan untuk karakterisasi reservoar hidrokarbon (litologi+fluida). Karakterisasi untuk menghasilkan pemisahan litologi dan fluida dapat menggunakan metode inversi elastik. Estimasi sebaran litologi dan fluida pada reservoar karbonat dilakukan menggunakan metode extended elastic impedance. Crossplot antara lambda rho dengan mu rho mampu memisahkan karbonat berisi gas terhadap litologi karbonat. Karbonat Halen porous berisi gas mempunyai cut off lambda rho 20 - 45 Gpa*g/cc dan mu rho 25 - 40 Gpa*g/cc. Sedangkan karbonat Van porous berisi gas mempunyai cut off lambda-rho 20 - 60 Gpa*g/cc dan mu-rho 15 - 44 Gpa*g/cc. Intercept dan Gradient untuk EEI di ekstrak dari seismik Near Angle Stack dan Far Angle Stack. Sudut optimal dari hasil korelasi silang antara log lambda rho dan log mu rho dengan log EEI mendapatkan sudut sensitif 16o (lambda rho) dan -40o (mu rho). Inversi sparse spike volume reflektifitas pada sudut -40o menghasilkan sebaran karbonat porous pada zona Halen-west, Van-north, Van-southeast. Sedangkan inversi pada volume reflektifitas pada sudut 16o menunjukkan sebaran gas di zona karbonat Halen-west, Van-southeast, Van-north. Zona prospek pada karbonat bertipe build up yang bersifat porous berisi gas. 


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