By Robert C. Liebermann, Carl H. Sondergeld
Knowledge of the relation among sonic speed in sediments and rock lithology is without doubt one of the keys to studying facts from seismic sections or from acoustic logs of sedimentary sequences. trustworthy correlations of rock pace with different petrophysical parameters, reminiscent of porosity or density, are crucial for calculating impedance versions for man made seismic sections (BIDDLE et al. , 1992; CAMPBELL and STAFLEU, 1992) or deciding on the beginning of reflectivity on seismic strains (SELLAMI et al. , 1990; CHRISTENSEN and SZYMANSKI, 1991). speed is therefore an enormous parameter for correlating lithological with geophysical info. fresh reviews have elevated our figuring out of elastic rock homes in siliciclastic or shaly sediments. The explanations for adaptations in speed were investigated for siliciclastic rocks (VERNIK and NUR, 1992), combined carbonate siliciclastic sediments (CHRISTENSEN and SZYMANSKI, 1991), artificial sand-clay combinations (MARION et aI. , 1992) or claystones (JAPSEN, 1993). The thoughts derived from those stories are even though in simple terms partially appropriate in natural carbonates. Carbon ates wouldn't have huge compositional diversifications which are, as is the case within the different sedimentary rocks, accountable for pace contrasts. natural carbonates are personality ized by means of the shortcoming of any clay or siliciclastic content material, yet are ordinarily produced and deposited at the most sensible or at the slope of remoted or indifferent carbonate structures, that experience no hinterland as a resource of terrigeneous fabric (WILSON, 1975; EBERLI, 1991).
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Extra resources for Experimental Techniques in Mineral and Rock Physics: The Schreiber Volume
Also visible on the right side of the grain is an anastomosing fibrous precipitate crust (probably an iron-rich smectite) with blocky precipitates. Scale bar at bottom of photo is 20 I'm. EDX(SEM) scan is of the oligoclase feldspar grain (2000 counts full logarithmic scale). Exps. 4, 5: Oligoclase/quartz in brine/C0 2 It appears that virtually all of the calcium released by the dissolution of oligoclase was incorporated back into the precipitates. Dissolved sodium, for the most part, did enter into the reprecipitation process and only a small fraction remained in solution.
J. (1991), Carbon Dioxide Injection and Resultant Alteration o/'the Weber Sandstone, Rangely Field, Colorado, Am. Assoc. Petrol. Geol. Bull. 75. 1489 1499. BURLEY, S. , and MACQUAKER, J. H. , Authigenic days, diagenetic sequences and conceptual diagenetic models in contrasting basin-margin and basin-center North Sea Jurassic sandvtones and mudstones. l· (Houseknecht. D. , and Pittman, E. M. Spec. Pub. 47, 1992) pp. 81 110. CHESTER, F. , and HIGGS, N. G. (1992), Multimechanism Friction Constitutil'e Model/ilr Ultrafine Quartz Gouge at Hypocentral Conditions, JGR (B) 97, 1859 1870.
Geol. Mem. 37, 1984) pp. 195-215. LAND, L. , MILLIKEN, K. , and McBRIDE, E. F. (1987), Diagenetic Evolution of'Ceno::oic Sandstones, Gulf of Mexico Sedimentary Basin, Sedim. Geol. 50, 195-225. LONGSTAFFE, F. , TILLEY, B. , Controls on porewater el,olution during sandstone diagenesis, western Canada sedimentary basin: An oxygen isotope perspectil'e. In Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones (Houseknecht, D. , and Pittman, E. D .. M. Spec. Pub. 47, 1992) pp. 13 -34. LOUCKS, R.
Experimental Techniques in Mineral and Rock Physics: The Schreiber Volume by Robert C. Liebermann, Carl H. Sondergeld