Abstract
The presence of gas in highly porous young sands significantly lowers the bulk modulus and typically creates high amplitude anomalies (bright spots) in seismic stack sections that make them direct hydrocarbon indicators (DHI). Though high amplitudes are more commonly a characteristic of gas, light and normal grade oil can also manifest high seismic amplitude responses. However, all bright anomalies may not be due to hydrocarbons and may need proper validation before drilling. Other related characteristics of gas reservoirs such as velocity and polarity, and associated phenomena such as ‘flat spots’, ‘shadow zones’ and time ‘sags’, manifested in seismic, can also act as indicators and may be considered for validating DHI amplitude anomalies for hydrocarbons. The genesis of high amplitudes is analyzed and DHI limitations outlined.
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References
Anstey AN (1977) Seismic interpretation, the physical aspects, record of short course “The new seismic interpreter”. IHRDC of Boston, Massachusetts pp 4.1–4.24
Bulloch TE (1999) The investigation of fluid properties and seismic attributes for reservoir characterization. Thesis, Michigan Technological University
Clark VA (1992) The effect of oil under in-situ conditions on the seismic properties of rocks. Geophysics 57:894–901
Ebrom D (2004) The low-frequency gas shadow on seismic sections. Lead Edge 23:772
Gregory AR (1977) Aspects of rock physics from laboratory and log data that are important to seismic interpretation. AAPG Mem 26:23–30
Liu Y (1998) Acoustic properties of reservoir fluids. PhD thesis, Stanford University
Nanda NC, Wason A (2013) Seismic rock physics of bright amplitude oil sands- a case study. CSEG Recorder, Focused article, 26–32
Osif TL (1988) The effect of salt, gas, temperature, and pressure on the compressibility of water. SPE Reserv Eng 3:175–181
Schroot BM, Schüttenhelm RTE (2003) Expressions of shallow gas in the Netherlands North Sea. Neth J Geosci 82:91–105
Strecker U, Knapp S, Smith M, Uden R, Carr M, Taylor G (2004) Reconnaissance of geological prospectivity and reservoir characterization using multiple seismic attributes on 3-D surveys: an example from hydrothermal dolomite, Devonian slave point formation, northeast British Columbia, Canada, CSEG National convention, pp 1–6
Wandler A, Evans B, Link C (2007) AVO as a fluid indicator: a physical modelling study. Geophysics 72:C 9–C 17
Wang Z (2001) Y2K tutorial- fundamentals of seismic rock physics. Geophysics 66:398–412
Whang LF, Lellis PJ (1988) Bright spots related to high. GOR oil reservoir in Green Canyon: 58th SEG Ann Internat Mtg, Anaheim, California, Expanded Abs, pp 761–763
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Nanda, N.C. (2016). Direct Hydrocarbon Indicators (DHI). In: Seismic Data Interpretation and Evaluation for Hydrocarbon Exploration and Production. Springer, Cham. https://doi.org/10.1007/978-3-319-26491-2_6
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DOI: https://doi.org/10.1007/978-3-319-26491-2_6
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