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Sattar N.,Uppsala University | Khan F.A.,Petronas | Farid A.,Petroleum Institute ADNOC | Khan A.A.,Saif Energy Ltd | And 2 more authors.
Leading Edge (Tulsa, OK)

It is generally believed that various exploration failures in the offshore areas of Pakistan are due to the absence of a mature petroleum system. However, a few recent gas shows and shales with 0.55-3.24% TOC suggest that a Middle-Upper Miocene lowstand systems tract (LST) exists that possesses organic, paleo-environmental, and sequence stratigraphic characteristics of a potential source rock. The objective of this work was to highlight and delineate the slope and basin facies through seismic sequence stratigraphy and seismic attribute analysis as a new approach to the interpretation of the southwestern Lower Indus Basin of Pakistan. Working within a sequence stratigraphic framework, four sequences have been delineated on the basis of reflection termination patterns. A sea-level curve was constructed from the reflection patterns representing coastal onlap. This sea-level curve was compared to a hypothetical sea-level curve generated by a spectral analysis Fourier transform function on the density logs. © 2010 Society of Exploration Geophysicists. Source

McArdle N.J.,Ffa Sciences, Llc | Ackers M.,Norwegian Energy Company ASA | Bryn B.K.,Norwegian Energy Company ASA
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources

Frequency decomposition methods have been applied to a seismic dataset which images the late Palaeocene Hermod Fm. submarine fan system which occurs within the Viking Graben in the Northern North Sea. Conventional bandpass decomposition methods are compared to HD frequency decomposition - a technique based on matching pursuit of wavelets and the sensitivities of each method are discussed. Red-Green-Blue colour blending is shown to image in great detail channels, levees and splays. In order to understand the controlling factors determining the colour, contrast and amplitude shown in the RGB blends produced using each decomposition method, synthetic models of a Hermod splay has been produced. Within these models thickness and acoustic impedance are varied to investigate which has a larger effect. Frequency decomposition and blending of the synthetic models closely resembles blends created from the original data and it is likely that thickness changes, within the Hermod fan, which varies from above the tuning thickness in the channel core, to below tuning in the distal splays is mainly responsible for colour, amplitude and constrast changes within the blends. Source

Ackers M.A.,Norwegian Energy Company ASA | Bryn B.K.L.,Norwegian Energy Company ASA | Seljebotn P.O.,Norwegian Energy Company ASA
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010

The Eocene Channel Complex (hereafter referred to as the ECC) - which was first identified by use of simple signal processing techniques performed in Petrel© - represents an untested play in the Norwegian North Sea. It is situated in close proximity to the Frigg Field (Heritier et al., 1979) and the East Frigg discoveries, and is believed to represent the eastern continuation of this proven hydrocarbon system. However, the reservoir is younger and displays a different seismic stratigraphic architecture. The finer detail of the depositional geometries was delineated by a combination of various techniques including random and coherent noise cancellation, spectral decomposition (Partyka et al., 1999) and volume blending in SV1 Pro©. This approach resulted in a significantly improved image of the ECC and the underlying Frigg and Hermod Formations. © 2010, European Association of Geoscientists and Engineers. Source

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