--> Abstract: The Use of Spectral Decomposition and Seismic Attribute Volumes in Mapping of Truncating Carbonate Units, by Hussain Najwani, Mahmood Mahrooqi, and Janine Jones; #90077 (2008)
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The Use of Spectral Decomposition and Previous HitSeismicNext Hit Previous HitAttributeNext Hit Volumes in Mapping of Truncating Carbonate Units

Hussain Najwani*, Mahmood Mahrooqi, and Janine Jones
PDO
*[email protected]

The mid-Cretaceous Natih Formation produces oil and gas in northern and central Oman. It consists of seven main carbonate members intercalated with shales of variable seal quality. The carbonate and shale sequence forms a total thickness of about 500 m. Previous and ongoing work suggested that conventional structural plays are creamed and that the future of Natih exploration lies in identifying stratigraphic sub-plays. The Natih truncation play consists of carbonate units truncating against the base Tertiary unconformity. Mapping of the truncating carbonate units is critical in verifying existing leads and identifying new ones. Various Previous HitseismicNext Hit volumes were examined out of which spectral decomposition slices volume (frequency slices), Previous HitseismicNext Hit envelope volume (instantaneous amplitude) and a coloured impedance volume (Previous HitseismicNext Hit inversion) proved useful for mapping the lateral extent of Natih truncations. These volumes yielded two comparable sets of truncating Natih unit trends. Most of the trends are compliant with well data and modelling results. Furthermore, a new well drilled to target a deeper objective confirmed a Natih trend. Despite this confidence, imprints of Previous HitseismicNext Hit data quality were noted and a Previous HitseismicNext Hit re-processing project was initiated to overcome observed Previous HitseismicNext Hit artefacts. Combining available well results with the Previous HitseismicNext Hit data and associated Previous HitattributeTop volumes resulted in refining current Natih interpretation that allowed for an improved understanding of some Natih prospects.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain