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Estimation of hydrologic properties of heterogeneous geologic media with an inverse method based on iterated function systems

Description: The hydrologic properties of heterogeneous geologic media are estimated by simultaneously inverting multiple observations from well-test data. A set of pressure transients observed during one or more interference tests is compared to the corresponding values obtained by numerically simulating the tests using a mathematical model. The parameters of the mathematical model are varied and the simulation repeated until a satisfactory match to the observed pressure transients is obtained, at which po… more
Date: May 1, 1996
Creator: Doughty, C.A.
Partner: UNT Libraries Government Documents Department
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Distinguishing Sedimentary Depositional Environments on Mars Using In-Situ Luminescence Measurements and Neural Network Analysis.

Description: Although not recognized as a true geologic period on Mars, the term 'Martian Quaternary' emerged at the 2001 LPSC. The phrase helps focus attention on the fact that Mars does indeed exhibit dynamic surface processes andd geomorphic features active on time scales less than 10{sup 6} years. As on earth evolving landscapes can serve as important storehouses for paltoclimatic and paIeoenvironmental records. However, deciphering the 'Quaternary' history of Mars will require the development of 4 new … more
Date: January 1, 2001
Creator: Lepper, K. E. (Kenneth E.) & Whitley, V. H. (Von H.)
Partner: UNT Libraries Government Documents Department
open access

DEVELOPMENT OF AN ADVANCED APPROACH FOR NEXT GENERATION, HIGH RESOLUTION, INTEGRATED RESERVOIR CHARACTERIZATION

Description: During the third quarter a suitable test site was obtained, data acquired, and the process of data loading and data QC/QA begun. Preliminary data analysis was done in log clustering, seismic interpretation, and engineering model construction. These analysis tasks were continuing at the conclusion of the quarter.
Date: October 1, 2002
Creator: Reeves, Scott R.
Partner: UNT Libraries Government Documents Department
open access

SEISMIC ATTENUATION FOR RESERVOIR CHARACTERIZATION

Description: RSI has access to two synthetic seismic programs: Osiris seismic modeling system provided by Odegaard (Osiris) and synthetic seismic program, developed by SRB, implementing the Kennett method for normal incidence. Achieving virtually identical synthetic seismic traces from these different programs serves as cross-validation for both. The subsequent experiments have been performed with the Kennett normal incidence code because: We have access to the source code, which allowed us to easily contro… more
Date: October 1, 2002
Creator: Walls, Joel; Taner, M.T.; Derzhi, Naum; Mavko, Gary & Dvorkin, Jack
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report. Origins of subsurface microorganisms: Relating laboratory microcosm studies to a geologic time scale.

Description: This project was conducted as part of the Department of Energy's Deep Subsurface Science Program. It was part of a larger effort to determine the origins of subsurface microorganisms. Two hypotheses have been suggested for the origins of subsurface microorganisms: (1) microorganisms were deposited at the time of (or shortly after) geologic deposition of rocks and sediments (the in situ survival hypothesis), and (2) microorganisms have been transported from surface environments to subsurface roc… more
Date: December 1, 1998
Creator: Kieft, Thomas; Amy, Penny S. & Phillips, Fred M.
Partner: UNT Libraries Government Documents Department
open access

Establishing the Relationship between Fracture-Related Dolomite and Primary Rock Fabric on the Distribution of Reservoirs in the Michigan Basin

Description: This topical report covers the year 2 of the subject 3-year grant, evaluating the relationship between fracture-related dolomite and dolomite constrained by primary rock fabric in the 3 most prolific reservoir intervals in the Michigan Basin (Ordovician Trenton-Black River Formations; Silurian Niagara Group; and the Devonian Dundee Formation). The characterization of select dolomite reservoirs has been the major focus of our efforts in Phase II/Year 2. Fields have been prioritized based upon th… more
Date: September 30, 2006
Creator: Grammer, G. Michael
Partner: UNT Libraries Government Documents Department
open access

Waste package for a repository located in tuff

Description: The development of waste packages for emplacement in a tuff repository has been proceeding during the past year on a broad front. Experimental work has been focused on determination of important package environment parameters and testing the response of waste forms and package materials to the anticipated environment. Conceptual designs have been selected with alternatives to accommodate present uncertainties in the environment and material performance. Computational capabilities are being adap… more
Date: November 1, 1983
Creator: Ballou, L. B.
Partner: UNT Libraries Government Documents Department
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Heterogeneity, permeability patterns, and permeability upscaling: Physical characterization of a block of Massillon sandstone exhibiting nested scales of heterogeneity

Description: Over 75,000 permeability measurements were collected from a meter-scale block of Massillon sandstone, characterized by conspicuous cross bedding that forms two distinct nested-scales of heterogeneity. With the aid of a gas minipermeameter, spatially exhaustive fields of permeability data were acquired at each of five different sample supports (i.e. sample volumes) from each block face. These data provide a unique opportunity to physically investigate the relationship between the multi-scale cro… more
Date: April 20, 2000
Creator: TIDWELL,VINCENT C. & WILSON,JOHN L.
Partner: UNT Libraries Government Documents Department
open access

Velocity analysis for transversely isotropic media

Description: The main difficulty in extending seismic processing to anisotropic media is the recovery of anisotropic velocity fields from surface reflection data. Velocity analysis for transversely isotropic (TI) media can be done by inverting the dependence of P-wave moveout velocities on the ray parameter. P-wave NMO velocity in homogeneous TI media with a vertical symmetry axis depends just on the zero-dip value V{sub nmo} and a new effective parameter {eta} that reduces to the difference between Thomsen… more
Date: August 1994
Creator: Alkhalifah, T. & Tsvankin, I.
Partner: UNT Libraries Government Documents Department
open access

Seismic Evaluation of Hydrocarbon Saturation in Deep-Water Reservoirs

Description: The ''Seismic Evaluation of Hydrocarbon Saturation in Deep-Water Reservoirs'' (Grant/Cooperative Agreement DE-FC26-02NT15342) began September 1, 2002. During this second quarter: A Direct Hydrocarbon Indicator (DHI) symposium was held at UH; Current DHI methods were presented and forecasts made on future techniques; Dr. Han moved his laboratory from HARC to the University of Houston; Subcontracts were re-initiated with UH and TAMU; Theoretical and numerical modeling work began at TAMU; Geophysi… more
Date: March 20, 2003
Creator: Batzle, M.; Han, D-h; Gibson, R. & Djordjevic, O.
Partner: UNT Libraries Government Documents Department
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DEVELOPMENT OF AN ADVANCED APPROACH FOR NEXT GENERATION, HIGH RESOLUTION, INTEGRATED RESERVOIR CHARACTERIZATION

Description: Work during this reporting period focused primarily on data processing in support of creation of the broadband transform function. Project participants processed seismic data and calculated attributes on that data, performed log clustering, produced a rock physics model, and completed the creation of the engineering model relating well logs and core data. These elements are essential input for the creation of the broadband transform function.
Date: January 1, 2003
Creator: Reeves, Scott R.
Partner: UNT Libraries Government Documents Department
open access

Geochemical variation of Columbia River basalts beneath the Hanford Reservation, Washington

Description: Major element and trace element analyses of Columbia River basalts have been compiled to indicate where geochemical changes occur in the stratigraphy of the basalts. The analyses were averaged and plotted on petrologic variation diagrams to elucidate geochemical trends and correlations. This report is concerned mainly with the major elements. (auth)
Date: September 30, 1972
Creator: Tatman, J.B.
Partner: UNT Libraries Government Documents Department
open access

Audio-magnetotelluric data collected in the area of Beatty, Nevada

Description: In the summer of 1997, electrical geophysical data was collected north of Beatty, Nevada. Audio-magnetotellurics (AMT) was the geophysical method used to collect 16 stations along two profiles. The purpose of this data collection was to determine the depth to the alluvial basement, based upon the needs of the geologists requesting the data.
Date: November 1, 1998
Creator: Williams, J. M.
Partner: UNT Libraries Government Documents Department
open access

2D Depth migration in transversely isotropic media using explicit operators

Description: Stable, explicit depth-extrapolation filters can be used to propagate plane waves corresponding to the qP and qSV (quasi-P and quasi-SV propagation) modes for transversely isotropic (TI) media. The author discusses and compare results of two different methods for obtaining the filters for TI media with a vertical axis of symmetry (VTI). The first, a modified Taylor series method, is used to calculate the N-coefficients of a finite-length filter such that the Taylor expansion around vertical pro… more
Date: April 1994
Creator: Uzcategui, O.
Partner: UNT Libraries Government Documents Department
open access

Status of evaluation of tuff in southern Nevada for geologic disposal of high level nuclear wastes

Description: Siliceous tuff in southern Nevada occurs in a complex and locally active geological environment. Regional thrust faulting, Basin and Range faulting, and present-day seismicity complicate exploration and site characterization activities. The inherent variability of tuff and the complexity of caldera complexes also complicate siting efforts, but may serve to enhance long-term containment. Time--space trends of silicic volcanism are moderately well-established, while those of recent basaltic volca… more
Date: December 31, 1979
Creator: Lappin, A. R. & Crowe, B. M.
Partner: UNT Libraries Government Documents Department
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P-wave signatures and parameterization of transversely isotropic media: An overview

Description: Progress in seismic inversion and processing in anisotropic media depends on our ability to relate different seismic signatures to the anisotropic parameters. While the conventional notation (stiffness coefficients) is suitable for forward modeling, it is inconvenient in developing analytic insight into the influence of anisotropy on wave propagation. The author gives a consistent description of P-wave signatures in transversely isotropic media with arbitrary strength of the anisotropy, using t… more
Date: July 1994
Creator: Tsvankin, I.
Partner: UNT Libraries Government Documents Department
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Modeling of strongly heat-driven flow in partially saturated fractured porous media

Description: We have performed modeling studies on the simultaneous transport of heat, liquid water, vapor, and air in partially saturated fractured porous media, with particular emphasis on strongly heat-driven flow. The presence of fractures makes the transport problem very complex, both in terms of flow geometry and physics. The numerical simulator used for our flow calculations takes into account most of the physical effects which are important in multi-phase fluid and heat flow. It has provisions to ha… more
Date: October 1, 1984
Creator: Pruess, K.; Tsang, Y. W. & Wang, J. S. Y.
Partner: UNT Libraries Government Documents Department
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Lutetian Limestones in the Paris Region: Petrographic and Compositional Examination

Description: Stone for building and decorating monuments in the Paris Basin from antiquity to the present came from numerous quarries in the Lutetian limestone formations of the region. To identify specific-stone sources used for masonry and sculptures in these monuments, a team of geologists and archaeologists has investigated 300 quarries and collected 2,300 limestone samples for study in a collaborative effort by geologists and chemists. Petrographic and paleontologic examinations of thin sections enable… more
Date: June 11, 1998
Creator: Blanc, A.; Holmes, L. L. & Harbottle, G.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of tuff as a medium for a nuclear waste repository: interim status report on the properties of tuff

Description: This report is the second in a series of summary briefings to the National Academy of Science`s (NAS) Committee on Radioactive Waste Management dealing with feasibility of disposal of heat-producing radioactive waste in silicic tuff. The interim status of studies of tuff properties determined on samples obtained from Yucca Mountain and Rainier Mesa (G-tunnel) located on the Nevada Test Site (NTS) are discussed. In particular, progress is described on resolving issues identified during the first… more
Date: July 1, 1980
Creator: Johnstone, J.K. & Wolfsberg, K. (eds.)
Partner: UNT Libraries Government Documents Department
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Coupled processes in single fractures, double fractures and fractured porous media

Description: The emplacement of a nuclear waste repository in a fractured porous medium provides a heat source of large dimensions over an extended period of time. It also creates a large cavity in the rock mass, changing significantly the stress field. Such major changes induce various coupled thermohydraulic, hydromechanic and hydrochemical transport processes in the environment around a nuclear waste repository. The present paper gives, first, a general overview of the coupled processes involving thermal… more
Date: December 1, 1986
Creator: Tsang, C. F.
Partner: UNT Libraries Government Documents Department
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