bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reservoir Geology Of Incised Valley-Fill Sandstones Of The Pennsylvanian Morrow Formation, Southern Stateline Trend, Colorado And Kansas
Authors: Bowen D.W. , Weimer Paul 
Published: October 2019

ABSTRACT
Incised valley-fill deposits of the Pennsylvanian Morrow Formation of eastern Colorado and western Kansas have proven to be prolific oil reservoirs. Since the discovery of oil from a Morrow sandstone reservoir at Sorrento Field in 1979, 66.5 million barrels of oil have been produced along two major incised valley trends. Ultimate cumulative production from these reservoirs is estimated to be 107 million barrels of oil. Understanding the trapping mechanisms and internal complexities of these reservoirs provides insight to significant opportunities for further exploration and development along these trends and important analog data for similar types of incised valley-fill reservoir plays worldwide.
The Morrow Formation is Early Pennsylvanian in age. Several fourth-order sequences comprise the upper Morrow siliciclastic interval. These high order sequences developed as a result of sea level fluctuations associated with Early Pennsylvanian glacio-eustasy. During the Morrowan, the study area was part of the broad, gently dipping northwest shelf of the Anadarko basin. Rising and falling sea level alternately submerged and exposed this shelf, causing maximum shoreline displacements of 90 to 125 miles (145 to 200 km) across the low-gradient muddy shelf. Extensive drainage systems trending northwest-to-southeast developed during each of these sea level cycles as rivers incised into the muddy shelf strata during lowstand periods. The reservoirs within these valleys are primarily amalgamated fluvial channel sandstones. Marine influenced sandstones are locally important reservoirs that formed from deposition in estuarine systems developed as valleys became flooded from rising sea level. Interfluve areas were sites of soil formation during valley incisement and valley-fill accumulation.
This study focuses on the southern area of the Stateline Morrow trend along the Colorado-Kansas border. Four sequences produce oil and/or gas from incised valley-fill reservoirs in three fields along this trend - Second Wind, Jace, and Moore-Johnson. Establishing the sequence stratigraphic framework for these incised valley-fill sandstones allows for the mapping of trap geometries for petroleum accumulation. The sequence stratigraphic framework is developed by correlating wireline logs and integrating core data. Once the sequence framework is established, individual valley-fill reservoirs can be defined, attributed to specific sequences, and their geometries mapped. Three-dimensional seismic data is of great benefit in determining the dimensions and the geometries of the oldest two valley-fill systems.
Complications to development geology arise when several valley systems of different ages are superposed and cross-cut. Moore-Johnson, Jace, and Second Wind fields illustrate problems with field exploitation due both to superposition of valleys and to internal reservoir complexity resulting from high-frequency relative sea level fluctuations.
APPLICATION OF A NEW HIGH RESOLUTION SEQUENCE STRATIGRAPHY FOR RESERVOIR MODELLING STUDIES OF THE UPPER MIOCENE DELTAIC RESERVOIRS OF THE CHAMPION FIELD, OFFSHORE BRUNEI DARUSSALAM
Authors: CARTER R.R. , VAN GILS J.L.W. , WALTON W. , FAH YAP KONG , BUCK S. 
Published: October 2019

ABSTRACT
Current completion targets are individual reservoir flow units, often comprising a single depositional unit such as an upper shoreface sandbody or a tidal channel which has remained undrained from previous development campaigns.
Identification, location, and accurate description of these targets requires detailed models of reservoir stratigraphy and architecture, based upon good-quality core and well data sets, together with accurate structural and stratigraphic mapping using high-resolution 3D seismic so that the connected oil in place and transmissivity can be estimated accurately for individual flow units.
The method of ichnofabric analysis, combined with routine sedimentology, provides unequivocal interpretation of shallow marine and estuarine depositional environments allowing the interpreter to recognize and determine the relative importance of the various stratal surfaces seen in cores. The tectonic tilt of the stratal surfaces as interpreted from dip-logs such as the FMI, FMS, or even the SHDT, assists in determining the relative importance of these stratal surfaces.
The key stratal surfaces concept provides the main correlation surfaces (erosional sequence boundaries and flooding surfaces) for delineating individual parasequences, parasequence sets and sequences and for constructing a new high-resolution sequence stratigraphy (HRSS). Once calibrated, these surfaces can be recognized in, and correlated between, uncored wells by the shapes of the natural gamma-ray and density logs. By careful integration of all well data with the high-resolution seismic within the HRSS framework, an accurate description of the geometries and architecture of all the reservoir sediment bodies is obtained.
The final product is a robust and accurate description of the reservoir architecture and facies contents down to the bedset (decimeter) scale. This is a sound basis from which to construct computer-based 3D reservoir models and assign petrophysical properties for reservoir simulation studies.
Shell’s proprietary reservoir modelling software (GEOCAP-MoReS) has been used to provide detailed static 3D reservoir models for reservoir simulation. Results of this work have allowed engineers to optimize field development plans in the mature development phase of field life.
ALLUVIAL FAN/FAN DELTA SEQUENCE STRATIGRAPHY IN A STRUCTURALLY SEGMENTED RIFT BASIN: SIDINGIN FIELD, NORTH AMAN TROUGH, CENTRAL SUMATRA, INDONESIA
Authors: LIRO LOUIS M. , DAWSON WILLIAM C. , YARMANTO  
Published: October 2019

ABSTRACT
The Aman Trough of Central Sumatra, Indonesia has two associated major hydrocarbon accumulations, Minas and Duri fields. As with most maturely explored basins, more recent exploration activities have involved smaller structural closures, often testing new or different exploration concepts. Sidingin Gas Field, discovered in 1989, is located on an isolated fault block on the northern end of the Aman Trough. Wells in the field encountered reservoir stratigraphy quite different from that encountered in most wells in the Aman Trough.
The stratigraphy of the North Aman Trough demonstrates several scales of stratigraphic development: (1) a 2nd order tectonic (syn-rift) cycle, encompassing the entire Pematang Group (Oligocene), composed of stacked fluvial-lacustrine-fluvial members; (2) a series of higher order (3rd order?) sequences, best observed in the fluvial strata, composed of basal coarse fluvial sandstones overlain by floodplain shales; (3) parasequences of individual sandstone/shale couplets.
The fluvial rocks in the North Aman Trough and in the Sidingin field are interpreted in terms of regularly varying and repeating base-level cycles. The sedimentology and stacking patterns can be explained in terms of lowered base-level producing highly erosional coarser-grained fluvial channel sands, likely autocyclic in origin, giving way to individual channel and splay sands deposited as base-level rose, and finally capped by a muddy floodplain shale interval. In many cases, the tops of the shale packages are capped with a paleosol, interpreted as a remnant subaerial exposure surface consistent with a relative lowering of base-level.
Although well logs through Sidingin field display somewhat similar log character to wells within the Aman Trough proper, evaluation of seismic facies and petrography yielded different stratigraphic interpretations. The reservoir in Sidingin field is interpreted as an alluvial fan and fan delta interval, sourced by highlands associated with the rift basin border fault. The facies successions from oxidized, proximal alluvial fan to intercalated fan delta–lacustrine shale strata suggest that base-level variations related to the local structuring controlled stratigraphic development and distribution in the Sidingin field area.
PROXIMAL NONMARINE SEQUENCE STRATIGRAPHY, RESERVOIR QUALITY, AND TECTONIC CONTROLS IN THE SOUTHERN GULF OF THAILAND
Authors: RADOVICH BARBARA J. 
Published: October 2019

ABSTRACT
Texaco Exploration drilled the Mayura #1 well in the southern Pattani Basin of the Gulf of Thailand in the first half of 1994 with partners Fina and Ampolex. The well was drilled on the ramp side of a half-graben and had numerous oil shows in proximal, nonmarine reservoirs within the synrift section. One DST zone flowed oil but the permeability of the reservoir units was compromised by kaolinite in the pore system. High frequency, nonmarine sequence stratigraphy was applied to the wireline log data. Interpretation criteria are outlined suitable for application to proximal stratigraphic positions within alluvial fan to braided plain environments. A typical sequence is composed of stacked, fining-upward parasequence units that aggrade during times of relative base level rise. Each sequence shows the depositional response to factors that reorganize the drainage patterns and/or the delivery system of sediments to the basin. This response records an overall maturing-upward of depositional processes in each sequence through geologic time. Alluvial fan lithologies accumulated near the base of the sequence and braided plain to high energy fluvial sands aggraded in the middle to the top of each sequence. The resulting stratigraphic architecture formed two reservoir plumbing systems that affected the DST results in the Mayura well.
Interpretation of seismic data shows that two large-scale movements on the border fault also affected the sediments in this basin. Tectonically-controlled sediment packages formed with rapid deposition into the accommodation created by slip on the border fault. Poorly organized depositional processes dominated at this time. As the accommodation filled, the fluvial plain broadened and a more mature, fluvial plain had time to develop and aggrade. Tectonic control on the sediments reduced and the influence of other factors, like base level, increased causing a stacked sequence architecture. Each rapid slip on the border fault created a low-order, shallowing-upward sediment package. It is also interpreted to be a ‘maturing-upward’ cycle of depositional processes. The low-order tectonic and higher-order sequence stratigraphy in graben settings show a hierarchy of depositional packages that can lead explorationists to greater predictability of reservoirs within nonmarine environments.
L’exemple du CETA pour les rapports futurs Union européenne / Royaume-Uni – et le report du CETA ?
Authors: Neuwahl Nanette 
Published: October 2019

Le Comprehensive Economic and Trade Agreement (CETA, soit l’Accord économique et commercial global entre l’Union européenne et le Canada) est un modèle utile pour les relations commerciales entre l’Union européenne (UE) et le Royaume-Uni après le retrait de ce pays du marché commun. Durant la phase de transition – s’il y en a une –, mais encore plus en absence d’un tel arrangement, les deux parties négociantes feraient bien de travailler à une entente basée sur tel accord commercial, qu’on pourrait provisoirement appeler CC-CETA (Cross-Channel CETA). Un accord inspiré du CETA, possiblement élargi avec d’autres secteurs, tels les services, apporterait des avantages distincts au Royaume-Uni et à l’UE, en remplacement partiel des relations du marché unique. Après avoir examiné d’autres options qui seraient également envisageables, des recommandations pour la conclusion d’un tel CC-CETA sont faites. La question de savoir comment le CETA lui-même pourrait être affecté par le Brexit ou par la conclusion d’un accord UE-Royaume-Uni, ainsi que l’effet préemptif d’un tel accord sur les relations entre le Canada et le Royaume-Uni sont également pris en considération. Finalement, le report du CETA pourrait aussi paraître une solution temporaire pour « assouplir » un Brexit trop dur. Toutefois, cette dernière option est pleine d’incertitudes et mérite d’être accompagné de mesures spécifiques pour certains secteurs.
La place déclinante de la critique dans la sociologie de l’école au Québec ? Hypothèses et pistes de réflexion
Authors: Maroy Christian 
Published: October 2019

Cet essai réflexif se propose de comprendre le recul relatif de la dimension critique au sein de la sociologie de l’éducation au Québec. En nous basant sur trois acceptions (épistémologique, rationnelle et sociale) de la critique, nous avançons trois hypothèses. La première hypothèse souligne la complexification et la fragmentation de la base normative de la critique des politiques et pratiques d’enseignement. Elle ne s’appuie plus seulement sur un idéal de démocratisation sociale, mais, parfois de façon ambigüe ou contradictoire, sur une pluralité de référents comme la subjectivation, la reconnaissance des différences culturelles, l’égalité des genres, mais aussi l’efficacité. Il en ressort une transformation mais aussi un affaiblissement de la critique sociale. La seconde hypothèse souligne combien la base épistémologique et rationnelle de la critique est fragilisée par l’évolution du contexte institutionnel dans lequel s’élabore la sociologie de l’éducation (inscription dans les facultés professionnelles ; articulation accrue entre recherche et commande sociale). Enfin, il y a un découplage entre une critique profane et une critique savante de l’école.
Fundamental niche unfilling and potential invasion risk of the slider turtle Trachemys scripta
Authors: Espindola Sayra , Parra Juan L. , Vázquez-Domínguez Ella 
Published: October 2019

Background
How species colonize new environments is still a fundamental question in ecology and evolution, assessable by evaluating range characteristics of invasive species. Here we propose a model approach to evaluate environmental conditions and species features to predict niche changes in non-equilibrium contexts. It incorporates potentially range-limiting processes (fundamental niche), hence allowing for better predictions of range shifts, differentiation of analog and non-analog conditions between the native and non-native (invaded) ranges, and identification of environmental conditions not currently available but likely in the future. We apply our approach with the worldwide invasive slider-turtle Trachemys scripta.

Methods
We estimated the native and non-native realized niches of T. scripta and built its fundamental niche based on key features of the turtle’s temperature physiological tolerance limits and survival-associated factors. We next estimated response functions adjusted to the physiological predictor variables and estimated habitat suitability values, followed by a comprehensive set of analyses and simulations to compare the environmental conditions occupied by T. scripta (at its native and non-native ranges).

Results
Climatic space analysis showed that the T. scripta’s non-native realized niche is 28.6% greater than the native one. Response curves showed that it does not use its entire range of temperature tolerances (density curves for native: 5.3–23.7 °C and non-native: 1.7–28.4 °C ranges). Whether considering the mean temperature of the warmest or the coldest quarter, it occupies a wider range of temperatures along its non-native distribution. Results of the response curves for worldwide (global) and across Mexico (regional) comparisons showed it occupies analog and non-analog conditions between its native and invaded ranges, exhibiting also unoccupied suitable climatic conditions.

Discussion
We demonstrate that T. scripta occupies a wider subset of its fundamental niche along its non-native range (within its physiological tolerances), revealing that the species observed niche shift corresponds to a different subset of its fundamental niche (niche unfilling). We also identified suitable environmental conditions, globally and regionally, where the slider turtle could potentially invade. Our approach allows to accurately predict niche changes in novel or non-equilibrium contexts, which can improve our understanding about ecological aspects and geographic range boundaries in current and potential invasions.
The innovation algorithms for multivariable state‐space models
Authors: Ding Feng , Zhang Xiao , Xu Ling 
Published: October 2019

SummaryThis paper derives the input‐output representation of the dynamical system described by a linear multivariable state‐space model and the corresponding multivariate linear regressive model (ie, multivariate equation‐error model). A projection identification algorithm, a multivariate stochastic gradient identification algorithm, and a multi‐innovation stochastic gradient (MISG) identification algorithm are proposed for multivariate equation‐error systems by using the negative gradient search and the multi‐innovation identification theory. The convergence analysis of the MISG algorithm indicates that the parameter estimation errors converge to zero under the persistent excitation condition. Finally, a numerical example illustrates the effectiveness of the proposed algorithms.
Vascularized and Innervated Skeletal Muscle Tissue Engineering
Authors: Gilbert‐Honick Jordana , Grayson Warren 
Published: October 2019

AbstractVolumetric muscle loss (VML) is a devastating loss of muscle tissue that overwhelms the native regenerative properties of skeletal muscle and results in lifelong functional deficits. There are currently no treatments for VML that fully recover the lost muscle tissue and function. Tissue engineering presents a promising solution for VML treatment and significant research has been performed using tissue engineered muscle constructs in preclinical models of VML with a broad range of defect locations and sizes, tissue engineered construct characteristics, and outcome measures. Due to the complex vascular and neural anatomy within skeletal muscle, regeneration of functional vasculature and nerves is vital for muscle recovery following VML injuries. This review aims to summarize the current state of the field of skeletal muscle tissue engineering using 3D constructs for VML treatment with a focus on studies that have promoted vascular and neural regeneration within the muscle tissue post‐VML.
Boosting the Performance of Environmentally Friendly Quantum Dot‐Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure
Authors: Pan Zhenxiao , Yue Liang , Rao Huashang , Zhang Jie , Zhong Xinhua , Zhu Zonglong , Jen Alex K.‐Y. 
Published: October 2019

AbstractGenerally, high light‐harvesting efficiency, electron‐injection efficiency, and charge‐collection efficiency are the prerequisites for high‐efficiency quantum‐dot‐sensitized solar cells (QDSCs). However, it is fairly difficult for a single QD sensitizer to meet these three requirements simultaneously. It is demonstrated that these parameters can be felicitously balanced by a cosensitization strategy through the adoption of environmental‐friendly Zn–Cu–In–Se and Zn–Cu–In–S dual QD sensitizers with cascade energy structure. Experimental results indicate that: i) the combination of the dual QDs can improve the light‐harvesting capability of the cells, especially in the visible light window; ii) the cosensitization approach can facilitate electron injection, benefitting from the cascade energy structure of the two QD sensitizers employed; iii) the charge‐collection efficiency can be remarkably enhanced by the suppressed charge‐recombination process due to the improved QD coverage on TiO2. Consequently, this cosensitization strategy delivers a new certified efficiency record of 12.98% for liquid‐junction QDSCs under AM 1.5G 1 sun irradiation. Moreover, the constructed cells exhibit good stability in a high‐humidity environment.
Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells
Authors: Jia Donglin , Chen Jingxuan , Zheng Siyu , Phuyal Dibya , Yu Mei , Tian Lei , Liu Jianhua , Karis Olof , Rensmo Håkan , Johansson Erik M. J. , Zhang Xiaoliang 
Published: October 2019

AbstractLiquid‐state ligand exchange provides an efficient approach to passivate a quantum dot (QD) surface with small binding species and achieve a QD ink toward scalable QD solar cell (QDSC) production. Herein, experimental studies and theoretical simulations are combined to establish the physical principles of QD surface properties induced charge carrier recombination and collection in QDSCs. Ammonium iodide (AI) is used to thoroughly replace the native oleic acid ligand on the PbS QD surface forming a concentrated QD ink, which has high stability of more than 30 d. The ink can be directly applied for the preparation of a thick QD solid film using a single deposition step method and the QD solid film shows better characteristics compared with that of the film prepared with the traditional PbX2 (X = I or Br) post‐treated QD ink. Infrared light‐absorbing QDSC devices are fabricated using the PbS‐AI QD ink and the devices give a higher photovoltaic performance compared with the devices fabricated with the traditional PbS‐PbX2 QD ink. The improved photovoltaic performance in PbS‐AI‐based QDSC is attributed to diminished charge carrier recombination induced by the sub‐bandgap traps in QDs. A theoretical simulation is carried out to atomically link the relationship of QDSC device function with the QD surface properties.
A UV‐LEDs based photomicroreactor for mechanistic insights and kinetic studies in the norbornadiene photoisomerization
Authors: Shen Chong , Shang Minjing , Zhang Hong , Su Yuanhai 
Published: October 2019

AbstractIn this work, we report a simple and inexpensive UV‐LEDs based photomicroreactor assembly constructed by commercially available components. The photoisomerization of norbornadiene to quadricyclane was selected to validate this novel photomicroreactor design. Mass transport limitation was eliminated and indicated by dimensionless numbers Fo and Da
II, and photons loss was evaluated considering the absorption and reflection of the microreactor walls. The solvents, photosensitizers, and light sources selections were optimized for achieving better photochemical performance and mechanistic insights. The detailed comparison between the high‐pressure mercury arc lamp and the UV‐LEDs strip revealed great potential of UV‐LEDs as appealing light source for photochemical transformations. Moreover, the reaction mechanism was thoroughly discussed and illustrated by the Jablonski diagram indicating electronic states transitions. According to possible intermediate steps, a kinetic model was proposed with the reaction rate constant being correlated with the photon flux, which is valuable for process optimization and further understanding reaction mechanisms.