Vp/Vs—A POTENTIAL HYDROCARBON INDICATOR

Tatham, Robert H.; Stoffa, Paul L.

doi:10.1190/1.1440668

Cited by 82 publications

(26 citation statements)

References 12 publications

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“…The ratio of the velocity of compressional waves, V p , to the velocity of shear waves, V^, is an important parameter for discriminating lithology and differentiating between water and gas saturations (Gregory, 1977;Tatham and Stoffa, 1976;Hamilton, 1979;Tatham, 1982). Recently, Rafavich et al (1984) suggested that VplV s velocity ratios discriminate mineralogy in limestones (specifically calcite vs. dolomite) and Wilkens et al (1984) showed that carbonate content dominates V p /V s in siliceous limestones.…”

Section: Vplv S Velocity Ratiomentioning

confidence: 99%

Parameters Controlling Acoustic Properties of Carbonate and Volcaniclastic Sediments at Sites 866 and 869

Ivanov¹

1995

Proceedings of the Ocean Drilling Program, 143 Scientific Results

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Comparison of the acoustic and index properties with the petrographic character of 125 brine-saturated carbonate and volcaniclastic rocks from Sites 866 and 869 indicates that porosity is the dominant parameter influencing P-and S-wave velocity and acoustic impedance. Porosity in the mid-Cretaceous platform carbonates (Site 866) is controlled by diagenetic alteration, rather than primary depositional texture. Replacement and cementation by dolomite yields the highest acoustic velocities. Similarly, porosity in the volcaniclastics (Site 869) is controlled by diagenetic alteration of components and partial replacement and cementing by zeolite.The density-velocity relationship of the carbonates shows excellent correlation with Gardners curve for limestone. The general Gardners curve, however, underestimates the velocities of the volcaniclastics. Laboratory porosity-velocity trends of the carbonates are consistently 5% to 20% higher than those predicted by the time-average equation using the correct matrix velocities. Similar crossplots for the volcaniclastics show a division into two distinct subgroups, each corresponding to a time-average equation with a different matrix velocity, which suggests that progressive diagenetic alteration of the volcaniclastics has decreased the matrix velocity. The VjJV s ratios of the carbonates do not discriminate mineralogic composition. Laboratory measurements, under effective pressure simulating in situ conditions, are 5% to 25% higher than analyses of velocity made aboard JOIDES Resolution under atmospheric pressure.The carbonates at Site 866 have a considerably wider range of acoustic impedance than the basalt. As a consequence, the contact between the carbonate succession and the underlying basalt basement in many drowned Cretaceous guyots of the equatorial Pacific Ocean may be difficult to image seismic-reflection profiles.

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Section: Vplv S Velocity Ratiomentioning

confidence: 99%

Parameters Controlling Acoustic Properties of Carbonate and Volcaniclastic Sediments at Sites 866 and 869

Ivanov¹

1995

Proceedings of the Ocean Drilling Program, 143 Scientific Results

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“…Stoffa (1976), andMcCormack et al (1984) demonstrated the combined use of V P and V S from seismic data for identification of hydrocarbon anomalies and stratigraphic interpretation. This was followed by development of empirical relationships between V P and V S in clastics (Castagna et al, 1985;Han et al, 1986) and carbonates (Rafavich et al, 1984).…”

Section: Geophysical Characterization Of Heavy-oil Formationsmentioning

confidence: 99%

1. Heavy-Oil Reservoirs: Their Characterization and Production

Chopra¹,

Lines²,

Schmitt³

et al. 2010

Heavy Oils

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“…To Figure 13.1a. PSSP reflections generated by conversion at the sea floor (after Tatham and Stoffa, 1976). (i) Geometry; (ii) the conversion coefficient versus angle of incidence in the water; the curves are labeled with the seafloor P-wave velocity in km/s.…”

Section: Solutionmentioning

confidence: 99%

Problems in Exploration Seismology and their Solutions

Geldart¹,

Sheriff²

2004

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Contents Preface xReferences 505Index 509Downloaded 06/25/14 to 134.153.184.170. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ Preface A number of geophysics texts (including our own) provide problems, but few furnish solutions to the problems. Thus students (and professors) who struggle with the problems but do not work them out for themselves miss many of the benefits of the problems. This work is our attempt to partially remedy this situation. This volume was begun to furnish solutions for the problems in the first edition of Exploration Seismology by Sheriff and Geldart; however, that project was never completed. After the second edition appeared in 1995, we revived and expanded the project to provide solutions not only for the problems in Exploration Seismology but also for additional problems. Our intention is to provide a stand-alone volume independent of Exploration Seismology which can be used with whatever textbooks professors and students are using. To this end many problems provide a brief summary of the basic theory required to solve the problem. These "backgrounds" should be regarded as an aide memoires only since they are not intended to develop the subject rigorously or in detail.Although this volume is independent of Exploration Seismology, we expect that a number of our readers will be using that text, and therefore we have organized and numbered the problems so as to be generally compatible with it; we have also used the same mathematical conventions and symbols (with a few exceptions).Measurements of time, fundamental in exploration seismology, are usually made to the nearest millisecond, but in some of the problems a precision of 10 ms or even less is used, especially when measurements on graphs are involved. Graphical solutions were generally obtained from plots on sheets of graph paper large enough to achieve the required accuracy, but the plots included here are, of necessity, reduced in sizes.A list of references cited is located at the end of the book. Terms which are in effect being defined have been italicized. The authors wish to acknowledge the generous assistance of Michael K. Fenwick in the preparation of this book.We invite readers to advise us of errors and faulty derivations or interpretations and also to send us alternative solutions or interpretations.L. P. Geldart R. E. Sheriffx Downloaded 06/25/14 to 134.153.184.170. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ Problems in Exploration Seismology and their Solutionswhat quantities or factors must be considered in arriving at the correct answer. Thirdly, we must consider the available information from which the answer is to be deduced. Some of the available data may not be relevant. Finally, we must determine how the relations between the various factors can be used to get from the starting point to the final goal, that is, the path that must be followed. We should plan how to obtain the solution. Often a diagram will help to u...

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Vp/Vs—A POTENTIAL HYDROCARBON INDICATOR

Cited by 82 publications

References 12 publications

Parameters Controlling Acoustic Properties of Carbonate and Volcaniclastic Sediments at Sites 866 and 869

Parameters Controlling Acoustic Properties of Carbonate and Volcaniclastic Sediments at Sites 866 and 869

1. Heavy-Oil Reservoirs: Their Characterization and Production

Problems in Exploration Seismology and their Solutions

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