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Closing the seismic resolution gap of fractures through seismic and image-log analysis, a North Sea case study

Ryan Michael Williams, Enric Pascual-Cebrian, Jon Charles Gutmanis and Gaynor Suzanne Paton
Closing the seismic resolution gap of fractures through seismic and image-log analysis, a North Sea case study
Interpretation (Tulsa) (May 2017) 5 (3): SJ21-SJ30

Abstract

The "seismic resolution gap" has been an area of ambiguity ever since the results of 3D seismic interpretation have been used as inputs for modeling purposes because many important structural events such as fractures are at or below seismic resolution, which can impinge reservoir properties such as porosity and permeability. Having the means to accurately map these events with confidence has always been a challenge. More often than not, localized mapping of these features at borehole conditions can be achieved by core or image-log analysis. Seismic-derived attributes have assisted in improving the interwell geologic understanding in a lateral sense, but they are always hampered by vertical resolution. Enhanced imaging, such as cyan-magenta-yellow blending of attributes, has helped improve the lateral understanding of fracture patterns and networks, as shown in this workflow, but the challenge with vertical resolution still persists. However, by combining borehole and seismic data studies in a distinct workflow, it has become possible to identify overlaps and misalignments, which in turn has assisted in identification of discrete structural patterns not previously identified because of the seismic resolution gap. These results will then be used to improve the confidence of structural interpretation and static fracture models, which all go toward improving reservoir simulation models and geologic understanding.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 5
Serial Issue: 3
Title: Closing the seismic resolution gap of fractures through seismic and image-log analysis, a North Sea case study
Affiliation: GeoTeric, London, United Kingdom
Pages: SJ21-SJ30
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 19
Accession Number: 2017-074491
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. charts, sects., sketch maps
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
Secondary Affiliation: GeoScience, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201739
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