By Robert C. Liebermann, Carl H. Sondergeld
Knowledge of the relation among sonic pace in sediments and rock lithology is likely one of the keys to reading facts from seismic sections or from acoustic logs of sedimentary sequences. trustworthy correlations of rock speed with different petrophysical parameters, corresponding to porosity or density, are crucial for calculating impedance versions for man made seismic sections (BIDDLE et al. , 1992; CAMPBELL and STAFLEU, 1992) or picking out the starting place of reflectivity on seismic strains (SELLAMI et al. , 1990; CHRISTENSEN and SZYMANSKI, 1991). pace is hence an enormous parameter for correlating lithological with geophysical facts. contemporary experiences have elevated our figuring out of elastic rock homes in siliciclastic or shaly sediments. The explanations for diversifications 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 innovations derived from those reviews are notwithstanding simply partially appropriate in natural carbonates. Carbon ates wouldn't have huge compositional diversifications which are, as is the case within the different sedimentary rocks, liable for pace contrasts. natural carbonates are personality ized by means of the inability of any clay or siliciclastic content material, yet are normally produced and deposited at the most sensible or at the slope of remoted or indifferent carbonate systems, that experience no hinterland as a resource of terrigeneous fabric (WILSON, 1975; EBERLI, 1991).
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A pace version could have enduring and becoming interpretive price, past its preliminary construction to optimize the seismic photograph. The 3-D pace version is usually equipped conscientiously with a mixture of geophysical and geologic enter a result of accuracy calls for put on it through the necessities of intensity imaging.
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And Surdam, R. ) (Amer. Assoc. Petrol. Geol. Mem. 37, 1984) pp. 15 45. , and ENG ELDER, T. (1988), An Experimental Study of' Permeability and Fluid Chemistry in an Artificially Jointed Marble, J. Geol. Res. 93 (B), 13763-13775. Vol. 141, 1993 Experimental Simulation of Plagioclase Diagenesis 247 MATHISEN, M. , Diagenesis of Plio-pleistocene nonmarine sandstones, Cayagan Basin, Philippines: Early del'elopment of secondary porosity in volcanic sandstones. In Clastic Diagenesis (McDonald, D. , and Surdam, R.
Part II: A Rel'ised Concept of Sediment Diagenesis, Can. Petrol. Geol. Bull. 26,57 -86. WHITE, D. fsedimentary rocks. , and Galley, 1. ) (Am. Assoc. Petrol. Geol. Mem. 4, 1965) pp. 342-366. , and SURDAM, R. C. (1985), Naturally Enhanced Porosity and Permeability in the Hydrocarbon Reserroirs of the Gippsland Basin, Australia, Proc. of the First Enhanced Oil Recovery Symposium, 79-109. 20/0 © 1993 Birkhiiuser Verlag, Basel PAGEOPH, Vol. 141, No. 2/3/4 (1993) A New Exploration Tool: Quantitative Core Characterization CARL H.
Magnesium and potassium, although present in the pore fluid, did not appear to have played a major role in the reprecipitation process as they were not detected by EDX(SEM). This observation for magnesium disagrees with the experiments of HAJASH and BLOOM (1991) who noted a dramatic decrease in their fluid concentration of Mg within the first two days. This disparity may be due to the difference in the initial Mg concentration. or result from the difference in the experiment temperature (Mg 1370 ppm at 200 C.