Up-to-date discoveries and perspectives for hydrocarbon exploration in the Upper Jurassic formations of the Polish Carpathian foreland

• Autorzy: Gliniak P.
• Konferencja: International Congress on the Jurassic System (7 ; 06-18.09.2006 ; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

A number of hydrocarbon accumulations with recoverable reserves ca. 6.5 million tons of oil equivalent, e.g. Grobla, Pławowice, Łąkta, Tarnów-Jurassic, Dąbrowa Tarnowska, Smęgorzów, Gruszów, Partynia-Podborze, Korzeniow, traped within the epicontinental Upper Jurassic formations have been discovered so far in the Polish Carpathian foreland and the Carpathian basement (Fig 1). The traps are of combined structural and stratigraphic type. Reservoir rock types are found to vary between matrix-dominated porous rocks to dual-porosity and dual-permeability rocks and from porous fractured to entirely fractured rocks. The types of reservoir rocks could ultimately be linked to sediment type, diagenetic processes, and position in the basin. Location of hydrocarbon accumulation is strictly connected with fault systems developed within the Mesozoic formations. The traps are sealed by Miocene claystones-mudstones and/or Upper Cretaceous marls. Results of recently carried out analysis of the petroleum system, especially identification of sufficient source rocks combined with effective geochemical and thermodynamic conditions for hydrocarbon generation and migration, indicate that there are still perspectives for further oil and gas discoveries within the Mesozoic formations, especially the Upper Jurassic ones. Using modern techniques of geophysical and geological data acquisition, integration and interpretation, like e.g. modeling of seismic images by artificial neural networks, is crucial for further successful exploration. It enables us for identification and classification of different genetically hydrocarbon traps. Interpretation of 2D and 3D seismic images is carried out using several additional procedures connected with PAL and RAVE applications of the Landmark Inc. software package. Also, additional analysis of seismic data based on differentiation of frequency image for particular objects like Fourier & Karhunen-Loeve transformations and spectral decomposition is used. Recently, a detailed facies and stratigraphic analysis of the Mesozoic formations of the Carpathian foreland resulted in defining some new possibilities of finding hydrocarbon fields within traps of a combined stratigraphic and tectonic type. Existing fields were used as case stories for identification of criteria for finding new prospective traps. Taking into account regional tectono-stratigraphic model of evolution of the Late Jurassic-Cretaceous sedimentary basin gives a perspective for further successful exploration in the areas formerly regarded as non-prospective.

Słowa kluczowe

EN

hydrocarbon accumulations; traps; seal; reservoir; prospective effect

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 258--260

Twórcy

autor

Gliniak P.

• Polish Oil and Gas Company, ul. Lubicz 25, PL-31503 Kraków, Poland,