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      Predicting seismic velocity and other rock properties from clay content only

      1 , 2 , 1 , 3 , 1
      GEOPHYSICS
      Society of Exploration Geophysicists

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          Abstract

          It has been shown that accurate predictions of compressional and shear‐wave velocities can be derived from measurements of clay content, porosity, and bulk density. In this paper, we test the efficacy of using a sequence of established petrophysical formulations to go a step further and predict porosity and bulk density as well as velocity from clay content alone. Other variables, like grain and pore‐fluid properties, are assumed to be constant, while empirical relationships are used to model such behaviors as grain packing and compaction.

          The sequence of formulations, referred to as the “model,” is evaluated using well‐log and core data from the Amazon Fan collected during Ocean Drilling Program Leg 155. Clay contents are estimated from the borehole gamma‐ray logs. These are input to the model, which in turn predicts observed porosities to a rms error of <20%, and bulk densities and compressional velocities to rms errors of ≤10%. The results suggest that with better measurements of clay content and improvements to the model, even more accurate predictions of velocity might be achieved for unconsolidated sediments.

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          Most cited references16

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          A variational approach to the theory of the elastic behaviour of multiphase materials

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            Continental stretching: An explanation of the Post-Mid-Cretaceous subsidence of the central North Sea Basin

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              VELOCITY AND ATTENUATION OF SEISMIC WAVES IN TWO‐PHASE MEDIA: PART I. THEORETICAL FORMULATIONS

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                Author and article information

                Journal
                GEOPHYSICS
                GEOPHYSICS
                Society of Exploration Geophysicists
                0016-8033
                1942-2156
                November 2003
                November 2003
                : 68
                : 6
                : 1847-1856
                Affiliations
                [1 ]Duke University, Department of Earth and Ocean Sciences, Durham, North Carolina 27708. Emails:
                [2 ]Formerly Duke University, Department of Earth and Ocean Sciences, Durham, North Carolina 27708; presently University of Connecticut, Department of Geology, Storrs, Connecticut 06269.
                [3 ]Duke University, Department of Civil and Environmental Engineering, Durham, North Carolina 27708.
                Article
                10.1190/1.1635037
                d35ecb83-72f0-4973-9f5e-5cfa431425a6
                © 2003
                History

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