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Thin-bedded strata and tuning effect as causes of seismic data anomalies in the top part of the Cenomanian sandstone in the Grobla–Rajsko–Rylowa area (Carpathian foreland, Poland)

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
A high-amplitude anomaly in seismic signal, i.e. a bright-spot, which is the main direct hydrocarbon indicator, may also occur due to interference between the reflected signals from the top and base of a thin bed (the tuning effect). In such settings the main problem is to distinguish amplitude anomalies associated with lithological changes or changes in gas saturation from anomalies originating from the tuning effect. We provide a method of interpreting the composite seismic signal produced by the interference between reflections. Such reflections occur along the top of the Cenomanian sandstone in the area of the Grobla–Rajsko–Rylowa 3-D seismic dataset (southern Poland). The non-standard method presented here is based on interpretation of seismic data which was rotated by 270°. The results of seismic modelling were used to develop criteria for interpretation of such data. These criteria are based on the difference between information carried by the peak-to-trough amplitude and that by the total amplitude of rotated seismic data. The difference was used to define the transfer function and to remove the high-amplitude anomalies caused by the constructive interference between the reflected signals from the top and bottom of the thinning stratum. The final outcome of the study was a map showing the seismic amplitude response at the top Cenomanian reflector unaffected by the tuning effect. The map shows the extent of the area where high-amplitude anomalies do not correspond with changes in thickness and petrophysical parameters within the top part of the Cenomanian. These anomalies are caused by a lateral increase in thickness of the Turonian and/or an increase in the velocity within the bottom part of the Senonian (Coniacian) strata. The map can be used to determine precisely the boundaries of the Rajsko and Rylowa gas reservoirs as well as to locate the potential extension of the reservoir zone to the east of the Rylowa 6 borehole.
Rocznik
Strony
691--710
Opis fizyczny
Bibliogr. 18 poz., rys., wykr.
Twórcy
autor
  • Faculty of Geology Geophysics and Environmental Protection, Department of Geophysics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, PoIand
  • Faculty of Geology Geophysics and Environmental Protection, Department of Geophysics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, PoIand
Bibliografia
  • 1. BARAN U., GLINIAK E., JAWOR E. and URBANIEC A. (1999) - Perspektywiczność kompleksu górnej jury w rejonie Bochnia-Dębica w świetle badań sejsmicznych i wyników geologiczno złożowych. Nauka i Przemysł w XXI wieku: 85-94.
  • 2. BROWN A.R., WRIGHT R.M., BURKHARD K.D., ABRIEL W.L. and McBEEATH R.G. (1986) - Tuning effects, lithological effects and depositional effects in the seismic response of gas reservoirs. Geophys. Prosp., 34: 623-647.
  • 3. CONNOLLY P. (2007) - A simple, robust algorithm for seismic net pay es-timation. The Leading Edge, 26 (10): 278-282.
  • 4. FLOREK R., GÓRKA A. and ZACHARSKI J. (2002) - Generation and ac-cumulation of hydrocarbons in Meso-Paleozoic structures of Carpathian Foreland - case studies of Grobla-Strzelce Wielkie-Rajsko (in Polish with English summary). Pr. Inst. Gór. Naft. i Gazow., 116: 39-43.
  • 5. FLOREK R., GÓRKA A. and ZACHARSKI J. (2006) - Wpływ architektury mezo-paleozoicznego podłoża miocenu na warunki migracji i akumulacji węglowodorów w utworach cenomanu i części przedgórza Karpat. Pr. Inst. Gór. Naft. i Gazow., 137: 231-239.
  • 6. JAWOR E. (1973) - Deposits conditions of the Grobla-Pławowice Zone in the background of deep tectonics of the area eastwards of Cracow (in Polish with English summary). Pr. Geol. PAN, 81.
  • 7. JAWOR E., JAWOR W. and BARAN U. (1997) - Rozwój piaskowców cenomanu w obszarze zapadliska przedkarpackiego i warunki występowania akumulacji węglowodorów. Rozwój polskiej myliśli w poszukiwaniach naftowych: 269-273.
  • 8. KALLWEIT R.S. and WOOD L.C. (1982) - The limit of resoluton of zero-phase wavelets. Geophysics, 47: 1035-1046.
  • 9. KARNKOWSKI P (1999) - Oil and Gas Deposits in Poland. Towarzystwo Geosynoptyków „Geos”, AGH, Kraków.
  • 10. MARZEC P. (2004) - An attempt to eliminate amplitude gains caused by tuning from a map of seismic reflexes from the Cenomanian sandstone in the Grobla oil and gas field. Pol. J. Miner. Res., 8 P: 161-172.
  • 11. MARZEC P. (2009) - Geologiczna interpretacja zapisu sejsmicznego rejestrowanego dla układów cienkowarstwowych. Ph. D. thesis Biblioteka Główna AGH, Kraków.
  • 12. OSZCZYPKO N. and ŚLĄCZKA A. (1989) - The evolution of the Miocene basin in the Polish Outer Carpathians and their foreland. Geol. Carpath., 40: 23-36.
  • 13. OSZCZYPKO N., KRZYWIEC P., POPADYUK I. and PERYT T. (2006) - Carpathian Foredeep Basin (Pol and and Ukraine) - its sedimenf ary, structural and geodynamic evolution. AAPG Mem., 84: 293-350.
  • 14. PIETSCH K. and MARZEC P. (2003) - Amplitude analysis as the tool for identifying seismic anomalies generated by tuning (in Polish with English summary). Geologia, 29 (1-2): 89-101.
  • 15. PIETSCH K., MARZEC P., TATARATA A. and KOBYLARSKI M. (2005) - Analiza zmienności sygnału sejsmicznego w strefie Grobla - Okulice-Rajsko pod kątem określenia obiektów do poszukiwań (Unpublished report). Praca Naukowo Badawcza Departamentu Poszukiwania Złóż. PGNiG S.A. CRZ: 2005/03/000051.
  • 16. WIDESS M.B. (1973) - How thin is a thin bed. Geophysl cs, 38 (6): 1176-1180.
  • 17. ZENG H. and BACKUS M.M. (2005a) - Interpretive advantages of 90°- phase wavelets: Part 1 - Modeling. Geophysics, 70: 7-15.
  • 18. ZENG H. and BACKUS M.M. (2005b) - Interpretive advantages of 90°- phase wavelets: Part 2 - Seismic applications. Geophysics, 70: 17-24.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-f394b3c9-36f6-4865-850f-c4cbec8fcc66
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