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Simple AVO Inversion for the Identification and Classification of Injected Heimdal Sands, Mariner Field, UKCS
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
The Heimdal reservoir component of the Mariner field is believed to have distinctive sand-injectite geometries and although a secondary reservoir target for field development, these Heimdal sands are known to be oil-bearing and have significant potential. Providing a detailed mapping of the location, thickness and fluid content of Heimdal reservoir massively de-risks their potential development and allows the best economic case to be made. Sub surface imaging of Heimdal sands is aided through inversion and quantitative interpretation of high quality PSDM Isometrix broadband data. The use of broadband data is a huge benefit for imaging sand injectites that have a low amplitude seismic response; the reduced side lobes and low frequency content is necessary to distinguish low impedance sand from background shale. This study implements simple AVO attributes using relative impedance of near and far stacks to image and distinguish oil and brine filled and this technique is verified with rock physics modeling and observations from a number of wells. This simple approach is satisfactory, particularly within the constraints of seismic uncertainty related to low impedance class IIP responses associated with heavy oil that occurs within Heimdal.