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Find the rocks and the fluids will follow; AVO as a tool for lithology classification

Kester D. Waters and Michael A. C. Kemper
Find the rocks and the fluids will follow; AVO as a tool for lithology classification (in Interpreting AVO, William Abriel (prefacer), John Castagna (prefacer), Douglas Foster (prefacer), Fred Hilterman (prefacer), Ron Masters (prefacer), George Smith (prefacer) and Chuan Yin (prefacer))
Interpretation (Tulsa) (May 2014) 2 (2): SC77-SC91

Abstract

Full-stack seismic interpretation continues to be the primary means of subsurface interpretation. However, the underlying impact of amplitude variation with offset (AVO) is effectively ignored or overlooked during the full-stack interpretation process. Recent advances in well-logging and rock physics techniques highlight the fact that AVO is a useful tool not only for detection of fluid anomalies, but also for the detection and characterization of lithology. We evaluated an overview of some of the key steps in the rock physics assessment of well logs and seismic data, and highlight the potential to move toward a new convention of interpretation on so-called lithology stacks. Lithology stacks may come in a variety of forms but should form the focus of interpretation efforts in the early part of the exploration and appraisal cycle. Several case studies were used to highlight that subtle fluid effects can only be extracted from the seismic data after careful assessment of the lithology response. These case studies cover a wide geography and variable geology and demonstrate that the techniques we tested are transferable and applicable across many different oil and gas provinces. The use of lithology stacks has many benefits. It allows interpretation on a single stack rather than many different offset or angle stacks. A lithology stack provides a robust, objective framework for lithostratigraphic interpretation and can be calibrated to offset wells when available. They are conceptually simple, repeatable, and transferable, allowing close cooperation across the different subsurface disciplines.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 2
Serial Issue: 2
Title: Find the rocks and the fluids will follow; AVO as a tool for lithology classification
Title: Interpreting AVO
Author(s): Waters, Kester D.Kemper, Michael A. C.
Author(s): Abriel, Williamprefacer
Author(s): Castagna, Johnprefacer
Author(s): Foster, Douglasprefacer
Author(s): Hilterman, Fredprefacer
Author(s): Masters, Ronprefacer
Author(s): Smith, Georgeprefacer
Author(s): Yin, Chuanprefacer
Affiliation: Ikon Science, London, United Kingdom
Affiliation: Chevron Upstream, San Ramon, CA, United States
Pages: SC77-SC91
Published: 201405
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 29
Accession Number: 2015-007000
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
Secondary Affiliation: University of Houston, USA, United StatesConocoPhillips, USA, United StatesGeokinetics, USA, United StatesHeadwave, USA, United StatesUniversity of Cape Town, ZAF, South AfricaFieldwood Energy, USA, United States
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: 201504
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