Lognormal field size distributions as a consequence of economic truncation
E. D. Attanasi, L.J. Drew
1985, Journal of the International Association for Mathematical Geology (17) 335-351
The assumption of lognormal (parent) field size distributions has for a long time been applied to resource appraisal and evaluation of exploration strategy by the petroleum industry. However, frequency distributions estimated with observed data and used to justify this hypotheses are conditional. Examination of various observed field size distributions across...
The copper-nickel concentration log: A tool for stratigraphic interpretation within the ultramafic and basal zones of the stillwater complex, Montana
L.J. Drew, W.J. Bawiec, N.J. Page, J.H. Schuenemeyer
1985, Journal of Geochemical Exploration (23) 117-137
An analogue to the electric well log was devised for copper-nickel concentration drill-hole data from the Basal and lower part of the Ultramafic zones of the Stillwater Complex using automated data processing. The copper-nickel concentration logs graphically represent intensity (concentration) values that reflect the distribution of the elements in sulfide...
The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O
Lawrence M. Anovitz, A.H. Treiman, E.J. Essene, B. S. Hemingway, E.F. Westrum Jr., V.J. Wall, R. Burriel, S.R. Bohlen
1985, Geochimica et Cosmochimica Acta (49) 2027-2040
Low temperature adiabatic calorimetry and high temperature differential scanning calorimetry have been used to measure the heat-capacity of ilmenite (FeTiO3) from 5 to 1000 K. These measurements yield S2980 = 108.9 J/(mol · K). Calculations from published experimental data on the reduction of ilmenite yield Δ2980(I1) = −1153.9 kJ/(mol · K). These new data, combined with available experimental and...
Conceptual model for origin of abnormally pressured gas accumulations in low-permeability reservoirs
B. E. Law, W. W. Dickinson
1985, American Association of Petroleum Geologists Bulletin (69) 1295-1304
The largest gas fields in the Rocky Mountain region occur in abnormally pressured reservoirs. These gas accumulations are different from more conventional gas accumulations in that they are commonly located in basin-center positions, they occur downdip from water-bearing rocks, and they are in overpressured or underpressured low-permeability reservoirs. We suggest...
ANNIE - INTERACTIVE PROCESSING OF DATA BASES FOR HYDROLOGIC MODELS.
Alan M. Lumb, John L. Kittle
1985, Conference Paper
ANNIE is a data storage and retrieval system that was developed to reduce the time and effort required to calibrate, verify, and apply watershed models that continuously simulate water quantity and quality. Watershed models have three categories of input: parameters to describe segments of a drainage area, linkage of the...
RAPID REMOVAL OF A GROUNDWATER CONTAMINANT PLUME.
L. Jeff Lefkoff, Steven M. Gorelick
Schmidt Kenneth D., editor(s)
1985, Conference Paper
A groundwater management model is used to design an aquifer restoration system that removes a contaminant plume from a hypothetical aquifer in four years. The design model utilizes groundwater flow simulation and mathematical optimization. Optimal pumping and injection strategies achieve rapid restoration for a minimum total pumping cost. Rapid restoration...
Chemistry and transport of soluble humic substances in forested watersheds of the Adirondack Park, New York
C. S. Cronan, G. R. Aiken
1985, Geochimica et Cosmochimica Acta (49) 1697-1705
Studies were conducted in conjunction with the Integrated Lake-Watershed Acidification Study (ILWAS) to examine the chemistry and leaching patterns of soluble humic substances in forested watersheds of the Adirondack region. During the summer growing season, mean dissolved organic carbon (DOC) concentrations in the ILWAS watersheds ranged from 21–32 mg C...
MODELING HYDRAULIC PROBLEMS USING THE CVBEM AND THE MICROCOMPUTER.
Chintu Lai, T. V. Hromadka II
1985, Conference Paper
The Complex Variable Boundary Element Method (CVBEM) offers an effective and efficient means for modeling two-dimensional potential and related flow problems. The method has been applied to various hydraulic and hydrodynamic problems - surface water, ground water, and other flows - and has proven its accuracy, reliability and usefulness. The...
Persisting effects of armored military maneuvers on some soils of the Mojave Desert
D.V. Prose
1985, Environmental Geology and Water Sciences (7) 163-170
Soil compaction and substrate modification produced during large-scale armored military maneuvers in the early 1940s were examined in 1981 at seven sites in California's eastern Mojave Desert Recording penetrometer measurements show that tracks left by a single pass of an M3 "medium" tank have average soil resistance values that are...
Partition coefficients of organic compounds in lipid-water systems and correlations with fish bioconcentration factors
C. T. Chiou
1985, Environmental Science & Technology (19) 57-62
Triolein-water partition coefficients (KtW) have been determined for 38 slightly water-soluble organic compounds, and their magnitudes have been compared with the corresponding octanol-water partition coefficients (KOW). In the absence of major solvent-solute interaction effects in the organic solvent phase, the conventional treatment (based on Raoult's law) predicts sharply lower partition...
Simulation of ground-water flow in southeastern Oahu, Hawaii
P. R. Eyre
1985, Groundwater (23) 325-330
On the leeward side of southeastern Oahu, Hawaii, near-vertical dikes have intruded the gently dipping and highly permeable lava flows of the Koolau mountain. These dikes bound the study area on the north and west and internally divide it into the Waialae and Wailupe-Hawaii Kai...
Recent movement on the Garlock Fault as suggested by water level fluctuations in a well in Fremont Valley, California
Diane K. Lippincott, John D. Bredehoeft, W. R. Moyle Jr.
1985, Journal of Geophysical Research Solid Earth (90) 1911-1924
Water levels have been continuously recorded since March 1978 in a well in Fremont Valley, where several strands of the adjacent Garlock fault zone have exhibited both left-lateral displacement and components of normal displacement. Differences in water levels indicate that a fault segment lies between the observation well and a...
The plumbotectonics of the West Shasta mining district, eastern Klamath Mountains, California
B. R. Doe, M.H. Delevaux, J. P. Albers
1985, Economic Geology (80) 2136-2148
The tectonic setting comprising the West Shasta mining district has often been compared with that of primitive island arcs. Concentrations of uranium, thorium, and lead and lead isotope compositions were determined for Devonian ores and rocks of the West Shasta district, eastern Klamath Mountains, California, to help evaluate the tectonic...
Excitation of a buried magmatic pipe: A seismic source model for volcanic tremor
Bernard Chouet
1985, Journal of Geophysical Research Solid Earth (90) 1881-1893
Recent observations of seismic events at various volcanoes suggest that harmonic tremor results from the sustained occurrence of so-called long-period or low-frequency events. Accordingly, we can view the long-period volcanic event as the elementary process of tremor and interpret it as the impulse response of the tremor-generating system. We present...
Cleavage strain in the Variscan fold belt, County Cork, Ireland, estimated from stretched arsenopyrite rosettes
M. Ford, C.C. Ferguson
1985, Journal of Structural Geology (7) 217-223
In south-west Ireland, hydrothermally formed arsenopyrite crystals in a Devonian mudstone have responded to Variscan deformation by brittle extension fracture and fragment separation. The interfragment gaps and terminal extension zones of each crystal are infilled with fibrous quartz. Stretches within the...
NATIONAL WATER INFORMATION SYSTEM OF THE U. S. GEOLOGICAL SURVEY.
Melvin D. Edwards
1985, Conference Paper
National Water Information System (NWIS) has been designed as an interactive, distributed data system. It will integrate the existing, diverse data-processing systems into a common system. It will also provide easier, more flexible use as well as more convenient access and expanded computing, dissemination, and data-analysis capabilities. The NWIS is...
Resolving controls on epeiric sedimentation using trend surface analysis
W.L. Watney
1985, Journal of the International Association for Mathematical Geology (17) 427-454
An understanding of patterns of regional sedimentation is crucial to identifying trends of perspective petroleum reservoirs. The Upper Pennsylvanian, Missourian Kansas City Group consists of repetitions of widespread carbonate rock and shale. Each of four cyclothems chosen for subsurface study of western Kansas contains transgressive and regressive lithofacies with evidence...
Thickness of ice on perennially frozen lakes
C.P. McKay, G.D. Clow, R.A. Wharton Jr., S. W. Squyres
1985, Nature (313) 561-562
The dry valleys of southern Victoria Land, constituting the largest ice-free expanse in the Antarctic, contain numerous lakes whose perennial ice cover is the cause of some unique physical and biological properties 1-3. Although the depth, temperature and salinity of the liquid water varies considerably from lake to lake, the...
A policy evaluation tool: Management of a multiaquifer system using controlled stream recharge
Wesley R. Danskin, Steven M. Gorelick
1985, Water Resources Research (21) 1731-1747
A model for the optimal allocation of water resources was developed for a multiaquifer groundwater and surface water system near Livermore, California. The complex groundwater system was analyzed using a transient, quasi-three-dimensional model that considers the nonlinear behavior of the unconfined aquifer. The surface water system consists of a reservoir...
Interpretation with a Donnan-based concept of the influence of simple salt concentration on the apparent binding of divalent ions to the polyelectrolytes polystyrenesulfonate and dextran sulfate
J.A. Marinsky, Robert F. Baldwin, M.M. Reddy
1985, Journal of Physical Chemistry (89) 5303-5307
It has been shown that the apparent enhancement of divalent metal ion binding to polyions such as polystyrenesulfonate (PSS) and dextran sulfate (DS) by decreasing the ionic strength of these mixed counterion systems (M2+, M+, X-, polyion) can be anticipated with the Donnan-based model developed by one of us (J.A.M.)....
Errors and parameter estimation in precipitation-runoff modeling: 1. Theory
Brent M. Troutman
1985, Water Resources Research (21) 1195-1213
Errors in complex conceptual precipitation-runoff models may be analyzed by placing them into a statistical framework. This amounts to treating the errors as random variables and defining the probabilistic structure of the errors. By using such a framework, a large array of techniques, many of which have been presented in...
Origin and evolution of the alkalic ultramafic rocks in the Coyote Peak diatreme, Humboldt County, California
J. W. Morgan, G.K. Czamanske, Wandless A. Gregory
1985, Geochimica et Cosmochimica Acta (49) 749-759
Instrumental-neutron-activation analyses are reported for two uncontaminated rocks, a phlogopite-rich clot, and two contaminated rocks from the Coyote Peak diatreme, northwestern California. These data, combined with Nd, Sr, and Pb isotopic evidence, have been modeled to a multi-stage evolution for the...
Isotopic studies of the late Archean plutonic rocks of the Wind River Range, Wyoming
J. S. Stuckless, C. E. Hedge, R. G. Worl, K. R. Simmons, Ignatius T. Nkomo, D. B. Wenner
1985, Geological Society of America Bulletin (96) 850-860
Isotopic studies of the Rb-Sr and U-Th-Pb systems in whole-rock samples and the U-Pb systematics for zircons document the existence of two late Arehean intrusive events in the Wind River Range. All of the systems examined indicate an age of ∼2,630 ± 20...
Regional magnetotelluric surveys in hydrocarbon exploration, Parana Basin, Brazil
William D. Stanley, Antonio Roberto Saad Roberto, Walter Ohofugi
1985, American Association of Petroleum Geologists Bulletin (69) 346-360
The magnetotelluric geophysical method has been used effectively as a hydrocarbon exploration tool in the intracratonic Parana basin of South America. The Parana basin has an area of about 1,200,000 km2 (463,000 mi2), extending over portions of Brazil, Paraguay, Uruguay, Argentina, and Bolivia. The Paleozoic marine sedimentary rocks in the Parana...
Correlations among hydrocarbon microseepage, soil chemistry, and uptake of micronutrients by plants, Bell Creek oil field, Montana
S.S. Roeming, T.J. Donovan
1985, Journal of Geochemical Exploration (23) 139-162
Chelate-extractable iron and manganese concentrations in soils over and around the Bell Creek oil field suggest that compared to low average background values, there are moderate amounts of these elements directly over the production area and higher concentrations distributed in an...
