1887

Abstract

Summary

In this study, we present a method for identification of the transition zone between mechanical and chemical compaction in data from shaly lithologies. By utilizing crossplots of wireline log-measured shear wave velocity (Vs) and bulk density (ρb), we observe an increased sensitivity compared to compressional wave velocity (Vp) to the onset of chemical compaction/cementation, while eliminating uncertainties related to porosity estimations. A clear change in the velocity (Vs) gradient with increasing density is shown to occur in data from eight exploration wells. Data above and below a certain velocity value (Vs = 1350 m/s) show substantially different behavior which is expected to be a result of cementation. A linear relation in the Vs –density domain is derived from the data and suggested as a representative trend for mechanical compaction in the study area. Our suggestion is that whenever recorded with sufficient vertical coverage, direct measurements of Vs and density are trust-worthy parameters for identifying the transition zone between mechanical and chemical compaction.

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/content/papers/10.3997/2214-4609.201702462
2017-11-11
2024-04-19
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References

  1. Avseth, P., Mukerji, T., Mavko, G. and Dvorkin, J.
    [2010] Rock-physics diagnostics of depositional texture, diagenetic alterations, and reservoir heterogeneity in high-porosity siliciclastic sediments and rocks — A review of selected models and suggested work flows. Geophysics, 75, 75A31–75A47.
    [Google Scholar]
  2. Bjørlykke, K.
    [2015] Compaction of sedimentary rocks: Shales, sandstones and carbonates, In Bjørlykke, K. (Ed.) Petroleum Geoscience. From Sedimentary Environments to Rock Physics - Second Edition. Springer-Verlag Berlin Heidelberg, 351–360.
    [Google Scholar]
  3. Clavier, C., Hoyle, W. and Meunier, D.
    [1971] Quantitative interpretation of thermal neutron decay time logs: Part I. Fundamentals and techniques. Journal of Petroleum Technology, 23, 743–755.
    [Google Scholar]
  4. Marcussen, Ø., Maast, T. E., Mondol, N. H., Jahren, J. and Bjørlykke, K.
    [2010] Changes in physical properties of a reservoir sandstone as a function of burial depth – The Etive Formation, northern North Sea. Marine and Petroleum Geology, 27, 1725–1735.
    [Google Scholar]
  5. Mondol, N. H.
    [2015] Well logging: Principles, Applications and Uncertainties, In Bjørlykke, K. (Ed.) Petroleum Geoscience. From Sedimentary Environments to Rock Physics -Second Edition. Springer-Verlag Berlin Heidelberg, 385–425.
    [Google Scholar]
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