bluuebunny/crossref_metadata_2025_split huggingface dataset:
Potential Pressure Compartments Sub-Salt in the Gulf of Mexico and Beneath Massive Debris Flows in the Gulf of Cadiz
Authors: Lowrie Allen , Hamiter Rhett , Moffett Susan , Somoza Luis , Maestro Adolfo , Lerche Ian 
Published: April 2012

Abstract
Pressure compartments may be defined as those volumes within the earth’s subsurface that are characterized by specific temperature/pressure ranges for the contained fluid. These compartments are the result of lithology, ability to contain/expel fluids, and the stresses from local tectonics. Until now, pressure compartments have been described for those zones well explored by seismic and well data. Potential compartments are suggested for zones that are under initial geophysical reconnaissance. These zones are volumes beneath the sub-salt play of the deep-water Gulf of Mexico and in the lower slope/continental rise of the Gulf of Cadiz.
Three known pressure compartments include normal-and geo-pressured units above the Louann Salt and a “gumbo zone” beneath the salt in the Gulf of Mexico. Additionally, a shear couple may be established as the migrating salt wedge overrides stationary basement. Stresses may be compressive above the proposed shear
zone and extensional below it, resulting in a right-lateral motion. Tectonic stresses coupled with a slight upward coarsening of sediments from basement may result in the development at least two separate pressure compartments, above and below the potential shear zone.
Mass wasting, from blocks to turbidites, has occurred along the Atlantic-facing Iberian and Moroccan continental margins over a downdip distance up to 300 km. Salt and clays within the migrating blocks and stacked thrusts have served as lubricants. The juxtaposition of varying lithologies could provide boundaries for complex compartments. The potential compartments discussed are located 5 to 12 km sub-surface. Local tectonics becomes an integral component in compartment development.
Prediction of the Nature of Reservoir Heterogeneity of an Incised-Valley Fill and the Minimum Data Density Required to Characterize it: An Example from the Northeastern Gulf of Mexico
Authors: Lucas Jennifer L. , Bartek Louis R. 
Published: April 2012

Abstract
This study involves characterization of the minimum amount of data required to accurately determine the threedimensional (3-D) variability of the distribution of heterogeneity within reservoir facies of an incised valley fill. The focus of this investigation is on strata deposited in a continental-margin environment with low sediment supply, low velocity tidal currents, and major storm influence (frequency: once every 6 years). Minimum data density (MINDDA) analysis was conducted on this system, which is one end member of a spectrum of systems that are currently being studied to determine the minimum amount of data required to accurately recognize depositional systems and make predictions of lithofacies distributions in a whole spectrum of depositional conditions. A 1.2-km interval between data points was initially used to map the area, which was then undersampled at data-point intervals of 2.3 km, 4.7 km, and 9.3 km. Comparisons were made to observe and note contrasts between maps with decreasing data density. In order to ascertain the optimum data density for this type of depositional system, increasing percentage of difference between maps was plotted on the y-axis versus an increasing sample interval on the x-axis to determine the point of diminishing returns (PDR). PDR is the point where the difference between maps, sampled at different intervals, is very small. Data falling beyond this point fail to proportionally increase the overall understanding of the nature of heterogeneity in facies distribution and are therefore insignificant. Accurate determination of the PDR saves time and money for exploration and production by diminishing the risk of an incorrect prediction of homogeneity, which could result from working with a sample density that is insufficient to establish the existence of sedimentary facies with limited distributions. It also assists the interpreter of 3-D seismic data with determining the maximum interval between profiles that can be used characterize the system without encountering problems with spatial aliasing of the distribution of reservoir attributes.
The most prominent geological systems in this study area are two incised valleys (eastern and western), the incised valley fills, and interfluves associated with the incised valleys. Results from initial analyses reveal that the incised valley fill associated with the depositional-boundary conditions of the system investigated in this study require a sample interval of 2.3 km between data points, whereas the interfluves require a sample interval of 4.7 km to accurately map variations in facies distribution. MINDDA has already been applied to a high-energy, high-sediment-supply end member, and upon completion of this study, a comparison between the two end members will also be conducted.
Stratigraphic Trap Potential on the Margins of Confined Turbidite Systems: Optimized Well Placement and Process Controls on Trap vs. Leak
Authors: McCaffrey William D. , Kneller Benjamin C. 
Published: April 2012

Abstract
Many turbidite-hosted fields rely on stratigraphic trapping on pinchout margins. In such fields, a key appraisal issue is characterization of the pinchout. In laterally or obliquely confined systems, for example, outcrop analog studies show that there are two end-member configurations. In end member (1), sand turbidites thin onto the confining surface, although the sandstone pinchout is commonly abrupt and individual events tend not to erode into earlier deposits. As a consequence of the poor connectivity between adjacent sandstones, targeted production wells must be drilled parallel or subparallel to the confining surface in order to sweep the reservoir effectively. In end member (2), turbidite sandstones commonly thicken toward the onlap slope, and individual events may incise into earlier deposits.
Although slope angle, flow incidence angle, and flow steadiness all play a role in determining onlap character, we maintain that the principal control is flow magnitude, with smaller magnitude flows producing end member (1) and large-magnitude flows producing end member (2). As paleoflow magnitude may be assessed from core, it becomes possible to make reasonable estimates of onlap character, even using core from wells placed away from the field margins. Where the position of the slope is poorly constrained, it can be difficult to optimize well placement. However, systematic facies and paleoflow variations are seen in individual turbidite sandstones as they approach the onlap, and they can potentially be exploited to provide information on both slope presence and proximity.
Climatic Control on Facies Architecture of Continental Stratigraphic Sequences in the Lower Jurassic Kayenta Formation of the Colorado Plateau
Authors: Sanabria Diego I. , Wagoner John C. Van , Vail Peter R. 
Published: April 2012

Abstract
The Lower Jurassic Kayenta Formation along the Echo Cliffs of northern Arizona represents an excellent analog for arid to semi-arid continental strata. Wet/dry climatic cycles exerted a major control on the regional distribution of facies tracts during deposition of the Kayenta Formation.
Two scales of wet/dry climatic cyclicity can be recognized in the record of the Kayenta Formation. Long-term climatic cycles are represented by three sequence sets that span the Kayenta and its transition to the Navajo Sandstone. Superimposed on this long-term signal is a series of high-frequency sequences expressed by an alternation of widespread fluvial and eolian deposition.
Dry portions of the cycles are characterized by low lake levels, fluvial incision, depressed water tables, and the development of extensive deflationary surfaces. Consequently, sequence boundaries at the base of incised valleys correlate with broad deflationary surfaces in a landward direction. Incised valleys, along the lower reaches of the system, are filled with fluvial strata deposited by ephemeral streams during lowstands of the lake level.
Eolian facies of regional to sub-regional extent are preserved during rises of the water table and serve as prominent stratigraphic markers. The top of these deposits is interpreted as the transgressive surface because it represents the peak of the first significant base-level rise.
Wet portions of the cycle consist of widespread fluvial deposits that correlate with lacustrine parasequences arranged in aggradational to progradational stacking patterns. Fluvial deposits in this part of the cycle are typically represented by amalgamated sandy facies punctuated by fine-grained overbank deposition.
Integrated Characterization of Clastic Reservoirs in the Veracruz Basin: A Case Study from Novillero Field, Veracruz, Mexico
Authors: Rosete Karyna Rodriguez , Gutiérrez Alvaro Chaveste , Engelhardt-Moore Nancy L. , Hill Bruce E. , Chen Jeff , Berendson Eduardo , Shenawi Shamsuddin , Dimas Marcos Quesada , Islas Felipe Jaime León , Vela Pedro 
Published: April 2012

Abstract
Tertiary clastic sequences within the Veracruz Basin of Mexico have been prolific hydrocarbon producers for many decades. However, during the last few years, production in older fields has declined. Several fields have recently been restudied to evaluate behind-pipe, deepening potential, and new exploration opportunities in the area. This paper focuses on a multidisciplinary integrated reservoir characterization study of Novillero field situated in the Veracruz Basin.
Novillero field is located about 100 km southeast of Veracruz, Mexico, between the towns of Loma Bonita and Cosamaloapan (Fig. 1). Discovered in 1966, this 15-well field has produced about 59 BCF of gas from calcareous turbidites and mudstone-rich debris flows.
Reprocessing of 2D seismic in 1996-97, along with the generation and calibration of synthetic seismograms, permitted seismic sequence stratigraphic analysis. Integration of the seismic and sequence stratigraphy, AVO analysis, biostratigraphy, well and core data, petrophysical analysis, and production data resulted in a complete reservoir model based on all available data. This field study led to the identification of numerous exploration and exploitation opportunities (both short- and long-term) in the field area.
A multidisciplinary team working on a common integrated Landmark™ platform incorporated geological, geophysical, petrophysical, and engineering data and expertise. This integration significantly reduced turnaround time and risk and obtained results that surpassed those of previous studies. Single-well recompletion of behind-pipe potential in previously untested horizons doubled total field production and led to renewed interest and development of older fields in the Veracruz Basin.
Genetic modifiers of sickle cell disease
Authors: Steinberg Martin H. , Sebastiani Paola 
Published: April 2012

AbstractSickle cell anemia is associated with unusual clinical heterogeneity for a Mendelian disorder. Fetal hemoglobin concentration and coincident α thalassemia, both which directly affect the sickle erythrocyte, are the major modulators of the phenotype of disease. Understanding the genetics underlying the heritable subphenotypes of sickle cell anemia would be prognostically useful, could inform personalized therapeutics, and might help the discovery of new “druggable” pathophysiologic targets. Genotype‐phenotype association studies have been used to identify novel genetic modifiers. In the future, whole genome sequencing with its promise of discovering hitherto unsuspected variants could add to our understanding of the genetic modifiers of this disease. Am. J. Hematol. 2012. © 2012 Wiley Periodicals, Inc.
Gender differences in acute pesticide‐related illnesses and injuries among farmworkers in the United States, 1998–2007
Authors: Kasner Edward J. , Keralis Jessica M. , Mehler Louise , Beckman John , Bonnar‐Prado Joanne , Lee Soo‐Jeong , Diebolt‐Brown Brienne , Mulay Prakash , Lackovic Michelle , Waltz Justin , Schwartz Abby , Mitchell Yvette , Moraga‐McHaley Stephanie , Roisman Rachel , Gergely Rita , Calvert Geoffrey M. 
Published: April 2012

AbstractBackgroundFarmworkers have a high risk for acute pesticide‐related illness and injury, and the rate among female farmworkers is approximately twice as high as that among males. Surveillance data were used to identify reasons for this gender difference.MethodsWe identified acute pesticide‐related illness and injury cases among farmworkers from the Sentinel Event Notification System for Occupational Risks (SENSOR)‐Pesticides Program and the California Department of Pesticide Regulation. Gender‐specific associations with acute pesticide‐related illness and injury were assessed using chi‐square tests. National Agricultural Workers Survey data were also examined.ResultsThe over‐representation of females among farmworker illness and injury cases was confined to females who did not handle pesticides (non‐handlers). Female non‐handler farmworkers who were affected were more likely to be working on fruit and nut crops, to be exposed to off‐target pesticide drift, and to be exposed to fungicides and fumigants compared to males.ConclusionsAlthough there is an increased risk for acute pesticide‐related illness and injury among female farmworkers, the absolute number of farmworkers with acute pesticide‐related illness and injury is far higher among males than females. Furthermore, farmworkers have little or no control over many of the identified contributing factors that led to illness and injury. Stringent enforcement of existing regulations and enhanced regulatory efforts to protect against off‐target drift exposures may have the highest impact in reducing acute pesticide‐related illness and injury among farmworkers. Am. J. Ind. Med. Published 2012. This article is a U.S. Government work and is in the public domain in the USA. Am. J. Ind. Med. 55:571–583, 2012. © 2012 Wiley Periodicals, Inc.
Statistical analysis for the Q‐factor of twin kHz QPOs
Authors: Wang J. , Chang H.K. , Zhang C.M. , Wang D.H. , Chen L. 
Published: April 2012

AbstractUsing the recently published data of twin kHz quasi‐period oscillations (QPOs) in neutron stars of low‐mass X‐ray binaries (LMXBs), we study the different profiles between bright Z sources and less luminous Atoll sources. The quality factors of upper kHz QPOs show a narrow distribution both for Z sources and Atoll sources, which concentrate at 7.98 and 9.75, respectively. The quality factors of lower kHz QPOs show a narrow distribution for Z sources and a broader distribution for Atoll sources, which concentrate at 5.25 and 86.22, respectively. In order to investigate the relation between the quality factor and the peak frequency of kHz QPOs, we fit the data with power‐law, linear, and exponential functions, respectively. There is an obvious trend that the quality factors increase with the peak frequencies both for upper and lower QPOs. The implications of our results are discussed (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Cyclic light and period variations of the UV Leonis system
Authors: Manzoori D. 
Published: April 2012

AbstractSolutions of the new standard V‐light curves for the EA type binary UV Leo are obtained using the PHOEBE code (0.31a version). Absolute parameters of the stellar components were then determined, enabling them to be positioned on the absolute magnitude‐color (l.e. MV vs. B – V) isochrones diagram, based on which the age of the system is estimated to be >4×109 yr. Also times of minima data (“O – C curve”) have been analyzed. Apart from an almost sinusoidal variation with a period of 29.63 yr, which modulates the orbital period, and was attributed to a third body orbiting around the system, other cyclic variation in the orbital period and also brightness, with time scales of 24.25 and 22.77 yr were found, respectively. We associate this with a magnetic activity cycle newly reported here for UV Leo (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Recent photometry of symbiotic stars
Authors: Skopal A. , Shugarov S. , Vaňko M. , Dubovský P. , Peneva S.P. , Semkov E. , Wolf M. 
Published: April 2012

AbstractWe present new multicolour (UBVRCIC) photometric observations of classical symbiotic stars, EG And, Z And, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C1, AG Peg, and AX Per, carried out between 2007.1 and 2011.9. The aim of this paper is to present new data of our monitoring programme, to describe the main features of their light curves (LC) and to point problems for their future investigation. The data were obtained by the method of the classical photoelectric and CCD photometry (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Second‐order error propagation in the Mueller matrix of a spectropolarimeter
Authors: Ilyin I. 
Published: April 2012

AbstractAccurate measurements of Stokes IQUV in spectral lines is required for precise reconstruction of stellar magnetic field geometries with Zeeman‐Dopper imaging. Spectral Zeeman features are intrinsically weak and subjected to a number of instrumental uncertainties. The aim of this work is to study the details of the instrumental uncertainties in the Stokes IQUV measurements in spectral lines and ways of their reduction. We make a practical comparison of the polarimetric performances of two high‐resolution échelle spectropolarimeters, namely SOFIN at the NOT, and HARPS at ESO. We show the residual spectra for both instruments to characterize the cross‐talk between the observed Stokes parameters. We employ a self‐calibrating least‐squares fit to eliminate some of the polarization uncertainties to derive the full Stokes vector from stellar spectra (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Kinetic helicity decay in linearly forced turbulence
Authors: Brandenburg A. , Petrosyan A. 
Published: April 2012

AbstractThe decay of kinetic helicity is studied in numerical models of forced turbulence using either an externally imposed forcing function as an inhomogeneous term in the equations or, alternatively, a term linear in the velocity giving rise to a linear instability. The externally imposed forcing function injects energy at the largest scales, giving rise to a turbulent inertial range with nearly constant energy flux while for linearly forced turbulence the spectral energy is maximum near the dissipation wavenumber. Kinetic helicity is injected once a statistically steady state is reached, but it is found to decay on a turbulent time scale regardless of the nature of the forcing and the value of the Reynolds number (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Methoxychlor‐Induced Ovarian Follicle Toxicity in Mice: Dose and Exposure Duration‐Dependent Effects
Authors: Paulose Tessie , Tannenbaum Lawrence V. , Borgeest Christina , Flaws Jodi A. 
Published: April 2012

BACKGROUNDMethoxychlor (MXC) is specifically known to target ovarian antral follicles, increasing atresia (death via apoptosis) in them. This is of concern because females are born with a finite pool of ovarian follicles. Only limited studies have explored the phenomenon of a reduced fertility threshold for effect based on the percentage of antral follicle atresia. METHODS: In this article, we report on adult female CD‐1 mice exposed intraperitoneally to various doses of MXC for 5, 10, 20, and 30 days. In the 20‐day treatment, mice were dosed with either the vehicle or MXC at 64 or 96 mg/kg/day, whereas in the 30‐day treatment, mice were dosed with vehicle or MXC at 48, 64, or 96 mg/kg/day. The mice that were dosed with MXC for 30 days were also mated with untreated males for a determination of overall fertility.RESULTSA significantly increased percentage (50%) of atretic antral follicles was observed only after 20 and 30 days of treatment. Specifically, mice treated with MXC64 for 20 and 30 days had an increased percentage of atretic antral follicles compared with vehicle‐treated mice. Interestingly, mice dosed with MXC96 had an increased percentage of atretic antral follicles after 30 days, but not after 20 days of treatment compared with vehicle‐treated mice. Overall fertility of the mice was not different compared with controls.CONCLUSIONSThe results indicate that as much as a 50% increase in atretic antral follicles does not affect the immediate fertility of the mice. Birth Defects Res (Part B) 00:1–6, 2012. Published 2012 by Wiley Periodicals, Inc.
Similarity in Venom Alkaloid Chemistry of Alate Queens of Imported Fire Ants: Implication for Hybridization between Solenopsis richteri and S. invicta in the Southern United States
Authors: Chen Li , Lu Yong‐Yue , Hu Qiong‐Bo , Fadamiro Henry Y. 
Published: April 2012

AbstractBoth cis‐ and trans‐2‐methyl‐6‐undecylpiperidines, MC11P, have been previously reported as the major components of the venom of alate queens of the imported fire ants, Solenopsis richteri (black) and S. invicta (red). To identify the minor components of venom alkaloids from alate queens and compare the venom alkaloid chemistry of alate queen of their hybrid (S. richteri×S. invicta) with that of the two parental fire ant species (S. richteri and S. invicta), silica‐gel short‐column chromatography was utilized for separating cis‐stereoisomers of venom alkaloids from trans‐stereoisomers. GC/MS Analyses of venom‐alkaloid chemistry of alate queens demonstrated that fewer alkaloid peaks were detected in the chromatograms of the alate queens compared to those of workers. Three new compounds, 7, 12, and 13, were detected as minor components in the venom of alate queens of all three fire ant species. Alate queens of hybrid fire ants showed cis‐ and trans‐alkaloid patterns similar to those of the parental species. Similarity in venom‐alkaloid chemistry of alate queens of S. richteri and S. invicta, and their hybrid may indicate their reproductive compatibility in the hybrid zone in southern United States, where all three species occur sympatrically.
Chemical Diversity of Essential Oils from Asteriscus graveolens (Forssk.) Less.: Identification of cis‐8‐Acetoxychrysanthenyl Acetate as a New Natural Component
Authors: Cristofari Gregory , Znini Mohamed , Majidi Lhou , Mazouz Hamid , Tomi Pierre , Costa Jean , Paolini Julien 
Published: April 2012

AbstractAsteriscus graveolens is an endemic medicinal plant mainly distributed in south‐western Algeria and south‐eastern Morocco. The essential oils of leaves, stems, and flowers of A. graveolens had been studied by GC, GC/MS, and 13C‐NMR. The spectral data of two nerolidol derivatives, 6‐oxo‐ and 6‐hydroxycyclonerolidol, were reassigned by 1D‐ and 2D‐NMR spectroscopy. These compounds can be considered as chemical markers of this genus. The structure of a monoterpenic diester with a chrysanthenane skeleton, i.e., cis‐8‐acetoxychrysanthenyl acetate, was determined for the first time on the basis of GC/MS, and 1D‐ and 2D‐NMR. The stem and leaf oils were characterized by high content of oxygenated sesquiterpenes with 6‐oxo‐ and 6‐hydroxycyclonerolidol as major components, and the flower essential oils were dominated by the new monoterpenic compound cis‐8‐acetoxychrysanthenyl acetate.