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Office of Scientific & Technical Information Technical Reports
8,626
Texas State Publications
182
Technical Report Archive and Image Library
60
Office of Technology Assessment
42
Congressional Research Service Reports
40
D. Jack Davis Art Education Collection
23
LGBT Collections
4
Dennis Vercher Collection (The Dallas Way)
3
Clara Luper Collection
2
Oklahoma Historical Society Manuscript Collection
2
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Texas Motor Vehicle Traffic Accident Summaries
42
Argonne National Laboratory Reports
35
Data Summary of Municipal Solid Waste Management Alternatives
23
Fiscal Year 1992
16
San Antonio Monthly Reports
16
United States Geological Survey Reports
16
San Antonio Board of Review for Historic Districts and Landmarks Monthly Report
14
Summary of All Reported Accidents in Rural Areas of Texas
14
Summary of All Reported Accidents in the State of Texas
14
Background paper
13
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Results:
1 - 24 of
8,985
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500 MW demonstration of advanced wall-fired combustion techniques for the reduction of nitrogen oxide (NO{sub x}) emissions from coal-fired boilers. Third quarterly progress report, 1992: Innovative Clean Coal Technology (ICCT)
The project provides a stepwise retrofit of an advanced overfire air (AOFA) system followed by low NO{sub x} burners (LNB). During each test phase of the project, diagnostic, performance, long-term, and verification testing will be performed. These tests are used to quantify the NO{sub x} reductions of each technology and evaluate the effects of those reductions on other combustion parameters such as particulatecharacteristics and boiler efficiency. Baseline, AOFA, and LNB without AOFA test segments have been completed. Analysis of the 94 days of LNB long-term data collected show the full-load NO{sub x} emission levels to be approximately 0.65 lb/MBtu. Flyash LOI values for the LNB configuration are approximately 8 percent at full-load. Corresponding values for the AOFA configuration are 0.94 lb/MBtu and approximately 10 percent. Abbreviated diagnostic tests for the LNB+AOFA configuration indicate that at 500 MWe, NO{sub x} emissions are approximately 0.55 lb/MBtu with corresponding flyash LOI values of approximately 11 percent. For comparison, the long-term full-load, baseline NO{sub x} emission level was approximately 1.24 lb/MBtu at 5.2 percent LOI. Comprehensive testing of the LNB+AOFA configuration will be performed when the stackparticulate emissions issue is resolved. Testing of a process optimization package on Plant Hammond Unit 4 was performed …
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 Annual performance report for Environmental Monitoring and Oversight at Department of Energy facilities in New Mexico
In October 1990 an Agreement-in-Principle (AIP) was entered into between the US Department of Energy (DOE) and the State of New Mexico for the purpose of supporting State oversight activities at DOE facilities in New Mexico. The State`s lead agency for the Agreement is the New Mexico Environment Department (NMED). DOE has agreed to provide the State with resources over a five year period to support State activities in environmental oversight, monitoring, access and emergency response to ensure compliance with applicable federal, state, and local laws at Los Alamos National Laboratory (LANL), Sandia National Laboratories (SNL), the Waste Isolation Pilot Plant (WIPP), and the Inhalation Toxicology Research Institute (ITRI). The Agreement is designed to assure the citizens of New Mexico that public health, safety and the environment are being protected through existing programs; DOE is in compliance with applicable laws and regulations; DOE has made substantial new commitments; cleanup and compliance activities have been prioritized; and a vigorous program of independent monitoring and oversight by the State is underway. This report relates the quality and effectiveness of the facilities` environmental monitoring and surveillance programs. This report satisfies that requirement for the January--December 1992 time frame.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 annual report on scientific programs: A broad research program on the sciences of complexity
In 1992 the Santa Fe Institute hosted more than 100 short- and long-term research visitors who conducted a total of 212 person-months of residential research in complex systems. To date this 1992 work has resulted in more than 50 SFI Working Papers and nearly 150 publications in the scientific literature. The Institute`s book series in the sciences of complexity continues to grow, now numbering more than 20 volumes. The fifth annual complex systems summer school brought nearly 60 graduate students and postdoctoral fellows to Santa Fe for an intensive introduction to the field. Research on complex systems-the focus of work at SFI-involves an extraordinary range of topics normally studied in seemingly disparate fields. Natural systems displaying complex adaptive behavior range upwards from DNA through cells and evolutionary systems to human societies. Research models exhibiting complex behavior include spin glasses, cellular automata, and genetic algorithms. Some of the major questions facing complex systems researchers are: (1) explaining how complexity arises from the nonlinear interaction of simple components; (2) describing the mechanisms underlying high-level aggregate behavior of complex systems (such as the overt behavior of an organism, the flow of energy in an ecology, the GNP of an economy); and (3) creating …
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 Annual Report to the National Science Foundation
The Geometry Center research program has a number of different aspects. This report documents the work of the past year. The activities described here are organized under intertwined areas: manifold geometry and associated group theory; optimal geometries; dynamical systems; and computational geometry and computer graphics.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 Effluent and environmental monitoring report for the Bettis Atomic Power Laboratory Pittsburgh Site
The results of the radiological and non-radiological environmental monitoring programs for 1992 at the Bettis-Pittsburgh Site are presented. The results obtained from the monitoring programs demonstrate that the existing procedures ensured that environmental releases during 1992 were in accordance with applicable Federal and State regulations. Evaluation of the environmental data indicates that operation of the Laboratory continues to have no adverse effect on the quality of the environment. A conservative assessment of radiation exposure to the general public as a result of Laboratory operations demonstrated that the dose received by any member of the public was well below the most restrictive dose limits established by the Environmental Protection Agency and the Department of Energy.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 PVUSA progress report
Photovoltaics for Utility Scale Applications (PVUSA) is a national public-private partnership that is assessing and demonstrating the viability of utility-scale photovoltaic (PV) electric generating systems. This report updates the progress of the PVUSA project, reviews the status and performance of the various PV installations during 1992, and summarizes key accomplishments and conclusions from work to date.
Date:
December 31, 1992
Creator:
Ellyn, W.
System:
The UNT Digital Library
1992 PVUSA progress report
Photovoltaics for Utility Scale Applications (PVUSA) is a national public-private partnership that is assessing and demonstrating the viability of utility-scale photovoltaic (PV) electric generating systems. This report updates the progress of the PVUSA project, reviews the status and performance of the various PV installations during 1992, and summarizes key accomplishments and conclusions from work to date. Fall PV module costs and rising environmental pressures could make PV a significant source of large-scale power within the next decade. However, utility acceptance of this technology requires knowledge of PV operational characteristics in a utility system and confidence in predicting PV performance, reliability, and economics. PVUSA consists of two types of demonstrations: Emerging Module Technologies (EMTs), which are unproven but promising state-of-the-art PV technologies in 20-kW (nominal) arrays; and Utility Scale (US) systems, which represent more mature PV technologies in 200- to 500-kW (nominal) turnkey systems.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
1992 Technical Progress Report of the University of South Carolina's High Energy Physics Group
The high energy physics group at the University of South Carolina includes five teaching faculty members, one research faculty member, and five graduate students. Professors Childers and Darden devote most of their research effort to Fermilab experiment E789, which is designed to observe charmless two-body decays of b-flavored mesons and baryons. Prof. Wilson works on E789 and also on Fermilab experiment E687 which studies charm physics in the wide-band photon beam. Professors Rosenfeld and Wang participate in the AMY collaboration, which studies electron-positron interactions using the TRISTAN collider at KEK. Prof. Rosenfeld and one student collaborate with personnel from KEK and INS, Tokyo, on an experiment to detect a 17 keV neutrino in the {beta}-decay spectrum of {sup 63}Ni. Profs. Avignone and Rosenfeld are charter members of Fermilab proposal P803, which will search for the oscillation of muon neutrino to tau neutrino with sensitivity better than a factor of 40 than previously achieved. A brief discussion on the progress of each program is given.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
Advanced direct coal liquefaction concepts. Quarterly report, October 1, 1992--December 31, 1992
During the first quarter of FY 1993, the Project proceeded close to the Project Plan. The analysis of the feed material has been completed as far as possible. Some unplanned distillation was needed to correct the boiling range of the Black Thunder solvent used during the autoclave tests. Additional distillation will be required if the same solvent is to be used for the bench unit tests. A decision on this is still outstanding. The solvent to be used with Illinois No. 6 coal has not yet been defined. As a result, the procurement of the feed and the feed analysis is somewhat behind schedule. Agglomeration tests with Black Thunder coal indicates that small agglomerates can be formed. However, the ash removal is quite low (about 10%), which is not surprising in view of the low ash content of the coal. The first series of autoclave tests with Black Thunder coal was completed as planned. Also, additional runs are in progress as repeats of previous runs or at different operating conditions based on the data obtained so far. The results are promising indicating that almost complete solubilization (close to 90%) of Black Thunder coal can be achieved in a CO/H{sub 2}O …
Date:
December 31, 1992
Creator:
Berger, D. J.; Parker, R. J. & Simpson, P. L.
System:
The UNT Digital Library
Advanced liquefaction using coal swelling and catalyst dispersion techniques. Quarterly technical progress report, January--March 1992
Research in this project centers upon developing a new approach to the direct liquefaction of coal to produce an all-distillate product slate at a sizable cost reduction over current technology. The approach integrates all aspects of the coal liquefaction process including coal selection, pretreatment, coal swelling with catalyst impregnation, coal liquefaction experimentation, product recovery with characterization. alternate bottoms processing, and a technical assessment including an economic evaluation. The Department of Energy has not yet authorized starting the experimental aspects of this and other similar projects; specifically, approval of the National Environmental Policy Act (NEPA) requirements. A set of coal samples were sent to Hazen Research for beneficiation so that experimentation can get underway after DOE has approved the document.
Date:
December 31, 1992
Creator:
Curtis, C. W.; Gutterman, C. & Chander, S.
System:
The UNT Digital Library
Advanced liquefaction using coal swelling and catalyst dispersion techniques. Quarterly technical progress report, July--September 1992
The experimental study of coal swelling ratios have been determined with a wide variety of solvents. Only marginal levels of coal swelling were observed for the hydrocarbon solvents, but high levels were found with solvents having heteroatom functionality. Blends were superior to pure solvents. The activity of various catalyst precursors for pyrene hydrogenation and coal conversion was measured. Higher coal conversions were observed for the S0{sub 2}-treated coal than the raw coal, regardless of catalyst type. Coal conversions were highest for Molyvan-L, molybdenum naphthenate, and nickel octoate, respectively. Bottoms processing consists of a combination of the ASCOT process coupling solvent deasphalting with delayed coking. Initial results indicate that a blend of butane and pentane used near the critical temperature of butane is the best solvent blend for producing a yield/temperature relationship of proper sensitivity and yet retaining an asphalt phase of reasonable viscosity. The literature concerning coal swelling, both alone and in combination with coal liquefaction, and the use of dispersed or unsupported catalysts in coal liquefaction has been updated.
Date:
December 31, 1992
Creator:
Curtis, C. W.; Gutterman, C. & Chander, S.
System:
The UNT Digital Library
Advanced liquefaction using coal swelling and catalyst dispersion techniques. Quarterly technical progress report, October--December 1992
The evaluation of various catalyst pre or pyrene coal conversion continued. Higher coal conversions were observed for the S0{sub 2}-treated coal than the raw coal, regardless of catalyst type. Coal conversions were highest for Molyvan-L, molybdenum naphthenate, and nickel octoate. A technique to measure the effect of coal swelling and catalyst impregnation upon coal liquefaction has been developed, and experimentation is under way. Reactivity tests have been performed using S0{sub 2}-treated and untreated swelled Black Thunder Coal. Thermal reactions with swelled coals yielded much less coal conversion and pyrene conversion than did the swelled coal reactions with Molyvan-L. The study of bottoms processing consists of coupling solvent deasphalting with delayed coking to maximize the production of coal-derived liquids while rejecting solids within the coke drum. The batch deasphalting screening tests have been completed. While n-butane/pentane solvent blends initially appeared best, pentane alone at 380{degree}F provided an oil yield (63.6 wt%) that was desired for subsequent tests. The production of asphalt for the transport tests is underway. The target deasphalted oil yields are 40, 50 and 60 wt% of feed. This would produce asphalt with ash levels ranging from 20 to 30 wt% with which to run the transport tests.
Date:
December 31, 1992
Creator:
Curtis, C. W.; Gutterman, C. & Chander, S.
System:
The UNT Digital Library
Advanced Nmr Approaches in the Characterization of Coal. [Quarterly] Report No. 8
The paper submitted earlier on the use of (bicyclo[3.2.1]4pyrrolidino-N-methyl-octan-8-one triflate) ({sup 13}CO-123) as a {sup 13}C intensity standard was accepted for publication. Subsequently, {sup 13}CO-321 was used in this manner for quantitative {sup 13}C CP-MAS NMR analysis (including spin counting) of Argonne Premium coals. The cross-polarization time constants, T{sub CH}, and the rotating-frame proton spin-lattice relaxation times, T{sub 1p}{sup H}, were determined for each major peak of each coal via a combination of variable contact-time and variable spin-lock (T{sub 1p}{sup H}) experiments. Two or three components of rotating-frame {sup 1}H relaxation decay and two or three components of T{sub CH} behavior were observed for each major {sup 13}C peak of each coal. These data were used to determine the number of carbon atoms detected in each coal; these values are in the range between 77% and 87% of the amount of carbon known to be in each coal from elemental analysis data, except for Pocahontas No. 3, for which only 50% of the carbon was detected. In an attempt to use {sup 1}H CRAMPS to elucidate chemical functionality in coal, pyridine-saturated samples of the Argonne Premium coals were examined in detail in terms of their {sup 1}H CRAMPS NMR spectra. …
Date:
December 31, 1992
Creator:
Maciel, G. E.
System:
The UNT Digital Library
Advanced Nmr Approaches in the Characterization of Coal. [Quarterly] Report No. 9
A considerable effort in this project during the past few months has been focussed on the development of {sup 1}H and {sup 13}C NMR imaging techniques to yield spatially-resolved chemical shift (structure) information on coal. In order to yield the chemical shift information, a solid-state NMR imaging technique must include magic-angle spinning, so rotating gradient capabilities are indicated. A {sup 13}C MAS imaging probe and a {sup 1}H MAS imaging probe and the circuitry necessary for rotating gradients have been designed and constructed. The {sup 1}H system has already produced promising preliminary results, which are briefly described in this report.
Date:
December 31, 1992
Creator:
Maciel, G. E.
System:
The UNT Digital Library
Advanced NMR-based techniques for pore structure analysis of coal. Quarter report No. 4, 1 October 1992--30 December 1992
One of the main problems in coal utilization is the inability to properly characterize its complex pore structure. Coals typically have micro/ultra-micro pores but they also exhibit meso and macroporosity. Conventional pore size techniques (adsorption/condensation, mercury porosimetry) are limited because of this broad pore size range, microporosity, reactive nature of coal, samples must be completely dried, and network/percolation effects. Small angle scattering is limited because it probes both open and closed pores. Although one would not expect any single technique to provide a satisfactory description of a coal`s structure, it is apparent that better techniques are necessary. We believe that measurement of the NMR parameters of various gas phase and adsorbed phase NMR active probes can provide the resolution to this problem. We will investigate the dependence of the common NMR parameters such as chemical shifts and relaxation times of several different nuclei and compounds on the pore structure of model microporous solids, carbons, and coals. In particular, we will study the interaction between several small molecules and the pore surfaces in coals. These molecules have been selected for their chemical and physical properties. A special NMR probe will be constructed which will allow the concurrent measurement of NMR properties …
Date:
December 31, 1992
Creator:
Smith, D. M.
System:
The UNT Digital Library
Advanced NMR-based techniques for pore structure analysis of coal. Quarterly report No. 3, July 1, 1992--September 30, 1992
One of the main problems in coal utilization is the inability to properly characterize its complex pore structure. Coals typically have micro/ultra-micro pores but they also exhibit meso and macroporosity. Conventional pore size techniques (adsorption/condensation, mercury porosimetry) are limited because of this broad pore size range, microporosity, reactive nature of coal, samples must be completely dried, and network/percolation effects. Small angle scattering is limited because it probes both open and closed pores. Although one would not expect any single technique to provide a satisfactory description of a coal`s structure, it is apparent that better techniques are necessary. We believe that measurement of the NMR parameters of various gas phase and adsorbed phase NMR active probes can provide the resolution to this problem. We now have two suites of well-characterized microporous materials including oxides (zeolites and silica gel) and activated carbons from our industrial partner, Air Products in Allentown, PA. Our current work may be divided into three areas: small-angle X-ray scattering (SAXS), adsorption, and NMR.
Date:
December 31, 1992
Creator:
Smith, D. M.
System:
The UNT Digital Library
Agency for Nuclear Projects/Nuclear Waste Project Office final progress report
The Nevada Agency for Nuclear Projects/Nuclear Waste Project Office (NWPO) was formally established by Executive Policy in 1983 following passage of the federal Nuclear Waste Policy Act of 1982 (Act). That Act provides for the systematic siting, construction, operation, and closure of high-level radioactive defense and research by-products and other forms of high-level radioactive waste from around the country which will be stored at such repositories. In 1985 the Nevada legislature formally established the NWPO as a distinct and statutorily authorized agency to provide support to the Governor and State Legislature on matters concerning the high-level nuclear waste programs. The NWPO utilized a small, central staff supplemented by contractual services for needed technical and specialized expertise in order to provide high quality oversight and monitoring of federal activities, to conduct necessary independent studies, and to avoid unnecessary duplication of efforts. This report summarizes the results of this ongoing program to ensure that risks to the environment and to human safety are minimized. It includes findings in the areas of hydrogeology, geology, quality assurance activities, repository engineering, legislature participation, socioeconomic affects, risk assessments, monitoring programs, public information dissemination, and transportation activities. The bulk of the reporting deals with the Yucca Mountain …
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
Alternative Formulations of Regenerable Flue Gas Cleanup Catalysts. Progress Report, September 1, 1991--August 31, 1992
We have used non-aqueous impregnation techniques to prepare an aluminum oxide surface covered with a well-dispersed magnesium oxide layer using magnesium acetylacetonate dehydrate [Mg(acac){sub 2}{sm_bullet}2H{sub 2}0] as a precursor. Using lithium acetylacetonate as a precursor, we have begun attempts to prepare a similarly well dispersed surface layer of lithium ``oxide.`` We have generated higher weight loadings of magnesium on alumina by using a Soxhlet extractor to dissolve the sparingly soluble Mg(acac){sub 2}{sm_bullet}2H{sub 2}0 in methanol. With this device we are able to obtain loadings of MgO on the alumina up to 0.66 wt/wt%. The precursor samples were examined by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and our results indicate that the complex loses the water of hydration upon adsorption. It appears, however, that the initial form of the complex on the surface is as anhydrous crystallites. Heating the supported precursor under vacuum leads to ``melting`` of the crystals, which can be observed by DRIFTS. Decomposition of the precursor under nitrogen or air leads to very similar activity when adsorbing SO{sub 2}. SO{sub 2} uptake appears to be independent of whether O{sub 2} is Present in the gas stream or not. We have shown that SO{sub 2} adsorption increases with …
Date:
December 31, 1992
Creator:
Mitchell, M. B. & White, M. G.
System:
The UNT Digital Library
Alternative Formulations of Regenerable Flue Gas Cleanup Catalysts. Progress Report, September 1, 1992--November 30, 1992
Lithium can be used with good effectiveness as a promoter for SO{sub 2} adsorption on alumina due to its high basicity. The difficulty of depositing a layer on the surface of alumina must be overcome to achieve this goal. The x-ray diffraction studies indicate that the Mg precursor is well-dispersed on the alumina surface, and that the crystals formed, if any, are too small to be detected by the diffractometer. Further work must be done on the lithium-promoted samples to examine the dispersion on alumina.
Date:
December 31, 1992
Creator:
Mitchell, M. B. & White, M. G.
System:
The UNT Digital Library
Aluminum Coordination and Active Sites on Aluminas, Y Zeolites and Pillared Silicates. Progress Report, January 31, 1992--January 31, 1993
Effort was continued to characterize the nature of the Al species responsible for Lewis acidity in zeolites and in aluminas by NMR. While numerous techniques have been successful for scaling the acid strength of Broensted sites, the situation is not satisfactory for the Lewis acid sites. Initial rate of dehydrochlorination of 1,1,1-trichloroethane is sensitive to strength of Lewis acid sites. N-Butene isomerization has been extended to the new aluminas obtained from nano-sized precursors. O-Xylene isomerization was carried out in a recirculation reactor on H-mordenite samples containing Lewis or Broensted acid sites; effects of H{sub 2} and NO were also investigated. Cracking of methylcyclohexane and 3-methylpentane was investigated by EPR on H-mordenite. Sepiolite, a Mg silicate with zeolitic channels, had Al substituted for Si; the negative charge is balanced by, say, VO{sup 2+}. Transformation of ethanol into butadiene on this dual-function catalyst appears to result from a Prins reaction between acetaldeyde formed on the redox sites and ethylene resulting from dehydration of ethanol on Lewis sites.
Date:
December 31, 1992
Creator:
Fripiat, J. J.
System:
The UNT Digital Library
Ames Laboratory Site Environmental Report, Calendar year 1992
The summarized data and conclusions from the Ames Laboratory environmental monitoring program are presented in this Annual Site Environmental Report. Pollution awareness and waste minimization programs and plans implemented in 1990 are continuing to date. Ames Laboratory (AL) is responsible for a small chemical burial site, located on ISU property. The site was used for the disposal of chemical and metal slags from thorium and uranium production. Samples of water from existing test wells, and upstream and downstream sites on the nearby Squaw Creek, have not detected migration of the buried materials off site. Surface, hand auger and deep boring soil samples have been collected from the site. The analytical results are pending, Six new monitoring wells have been installed and sampled. Analytical results are pending. Ames Laboratory is responsible for an area contaminated by diesel fuel that leaked from an underground storage tank (UST) in 1970. The tank was removed that year. Soil borings and groundwater have been analyzed for contamination and a preliminary assessment written. Nine small inactive waste sites have been identified for characterization. The NEPA review for this work resulted in a CX determination. The work plans were approved by AL and CH. A subcontractor has …
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
Ames test mutagenicity studies of the subfractions of the mild gasification composite material, CTC No. 11. [Quarterly report, July--September 1992]
The results of the Ames testing of the CTC No. 11 subfractions indicates significant genotoxic activity in each of the four fractions. CTC No. 11 is quite genotoxic to bacteria and apparently contains a wide variety of mutagens. Since mutation is generally accepted as one of the first steps in carcinogenesis, CTC No. 11 has displayed potential carcinogenicity. The evidence collected from this study and testing of the whole sample is sufficient to suggest further testing of CTC No. 11 as a possible carcinogen.
Date:
December 31, 1992
Creator:
unknown
System:
The UNT Digital Library
Anaerobic processing of low-rank coals. Quarterly progress report, July 1--September 30, 1992
The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals and to assess the properties of the modified coal towards coal liquefaction. The main objectives for this quarter were: (i) continuation of microbial consortia maintenance and completion of coal decarboxylation using batch reactor system, (ii) decarboxylation of model polymer, (iii) characterization of biotreated coals, and (iv) microautoclave liquefaction of the botreated coal. Progress is reported on the thermogravimetric analysis of coal biotreated in the absence of methanogens and under 5% hydrogen gas exhibits increased volatile carbon to fixed carbon ratio; that the microbial consortia developed on coal are being adapted to two different model polymers containing free carboxylic groups to examine decarboxylation ability of consortium; completion of experiments to decarboxylate two model polymers, polyacrylic acid and polymethyl methacrylate, have been completed; that the biotreated coal showed increase in THF-solubles.
Date:
December 31, 1992
Creator:
Jain, M. K.; Narayan, R. & Han, O.
System:
The UNT Digital Library
Analysis and evaluation of interwell seismic logging techniques for reservoir characterization. [Quarterly report], April 1--June 30, 1992
The objective of this three-year research program is to investigate interwell seismic logging techniques for indirectly interpreting oil and gas reservoir geology and pore fluid permeability. This work involves a balanced study of advanced theoretical and numerical modeling of seismic waves transmitted between pairs of reservoir wells combined with experimental data acquisition and processing of measurements at controlled sites as well as in full-scale reservoirs. This reservoir probing concept is, aimed at demonstrating unprecedented high-resolution measurements and detailed interpretation of heterogeneous hydrocarbon-bearing formations. Part of the numerical model task is to investigate the sensitivity of the in-situ rock-physical properties of the formation such as porosity and permeability on three-component seismograms, and the pressure, as well as phase velocity and attenuation. For this purpose we have developed software to simulate synthetic seismograins associated with a point-source (compressional wave), and a point force (shear wave), in stratified fluid-filled porous media. In addition, we have developed software to calculate phase velocity and attenuation from interwell seismic waveforms. To demonstrate the use of these capabilities we present examples to simulate seismograms and dispersion and attenuation curves.
Date:
December 31, 1992
Creator:
Parra, J. O.
System:
The UNT Digital Library