Interpretation of 3D seismic and attribute analysis in complex reservoir lithology on the fields in the Drava Depression (northern Croatia)

摘要

U ovom radu opisana je interpretacija 3D seizmike i analize atributa na plinsko-kondenzatnim poljima u Dravskoj depresiji (Molve, Kalinovac, Stari Gradac). Zadatak reinterpretacije seizmike je utvrđivanje strukturno-tektonskih elemenata, te rješavanje litoloških (kolektorskih) svojstava područja. Nakon strukturne interpretacije izrađeni su i analizirani seizmički atributi traga i horizonata. Cilj izrade seizmičkih atributa je dobiti više informacija o sadržaju, kvaliteti i diskontinuitetima unutar ležišta kao i u međuprostoru. Vrijednosti seizmičkih atributa korelirane su s petrofizikalnim parametrima dobivenih analizom jezgara i karotažnih krivulja. U skladu s proizvodnim podacima prepoznate su seizmičke indikacije koje mogu predstavljati granice tj. barijere unutar pojedinih dijelova ležišta. Konačni rezultati ovog rada je utvrđivanje novog strukturno tektonskog sklopa, a analiza atributa doprinijela je novom načinu opisivanja ležišta koji može biti od znatne pomoći za njegovo bolje razumijevanje.%This paper describes interpretation of 3D seismic and attribute analysis on the gas-condensate fields in the Drava Depression (Molve, Kalinovac, Star! Gradac). The 3D seismic interpretation was performed by using standard procedure, starting from tying the well's depth data to seismic time data. After structural interpretation, the seismic attribute analysis was performed. Different seismic attributes were extracted from the seismic as attributes of trace and attributes of horizons. The aim of seismic attribute analysis was to obtain more information about structural, tectonic and stratigraphic settings and reservoir characteristics. - Seismic attributes were correlated to the average petrophysical parameters coming from core and log analysis. Analyses showed connection between seismic attribute values and petrophysical parameters. Hydrocarbons initially in place were estimated according to production data. The main objective was to find seismic indications (attributes), which could describe barriers that could represent the borders of each reservoir/hydrodynamic unit. The 3D seismic interpretation resulted in a new structural and tectonic solution, as well as detailed characterization of reservoir. Seismic attribute analysis resulted in a new way of reservoir delineation.