Subjects -> ENGINEERING (Total: 2844 journals)
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    - ENGINEERING (1420 journals)
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    - INDUSTRIAL ENGINEERING (101 journals)
    - MECHANICAL ENGINEERING (113 journals)

ENGINEERING (1420 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 9)
3D Research     Hybrid Journal   (Followers: 22)
AAPG Bulletin     Hybrid Journal   (Followers: 11)
Abstract and Applied Analysis     Open Access   (Followers: 4)
Aceh International Journal of Science and Technology     Open Access   (Followers: 9)
ACS Nano     Hybrid Journal   (Followers: 452)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Nova     Open Access   (Followers: 1)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 4)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access   (Followers: 1)
Active and Passive Electronic Components     Open Access   (Followers: 8)
Adaptive Behavior     Hybrid Journal   (Followers: 9)
Adsorption     Hybrid Journal   (Followers: 5)
Advanced Energy and Sustainability Research     Open Access   (Followers: 8)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 14)
Advanced Engineering Research     Open Access  
Advanced Journal of Graduate Research     Open Access   (Followers: 4)
Advanced Quantum Technologies     Hybrid Journal   (Followers: 1)
Advanced Science     Open Access   (Followers: 13)
Advanced Science Focus     Free   (Followers: 7)
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 11)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 20)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Engineering Software     Hybrid Journal   (Followers: 31)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 30)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 27)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 10)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 36)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 21)
Advances in Polymer Science     Hybrid Journal   (Followers: 54)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Remote Sensing     Open Access   (Followers: 58)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aerobiologia     Hybrid Journal   (Followers: 4)
Aerospace Systems     Hybrid Journal   (Followers: 10)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 8)
AIChE Journal     Hybrid Journal   (Followers: 38)
Ain Shams Engineering Journal     Open Access   (Followers: 7)
Al-Nahrain Journal for Engineering Sciences     Open Access  
Al-Qadisiya Journal for Engineering Sciences     Open Access   (Followers: 2)
AL-Rafdain Engineering Journal     Open Access   (Followers: 3)
Alexandria Engineering Journal     Open Access   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 12)
American Journal of Engineering Education     Open Access   (Followers: 20)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 31)
Annals of Civil and Environmental Engineering     Open Access   (Followers: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
Annals of Regional Science     Hybrid Journal   (Followers: 10)
Annals of Science     Hybrid Journal   (Followers: 10)
Annual Journal of Technical University of Varna     Open Access   (Followers: 1)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 2)
Applications in Energy and Combustion Science     Open Access   (Followers: 3)
Applications in Engineering Science     Open Access   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 8)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 22)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Engineering Letters     Open Access   (Followers: 4)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 11)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Physics Research     Open Access   (Followers: 7)
Applied Sciences     Open Access   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Archives of Thermodynamics     Open Access   (Followers: 13)
Arctic     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access   (Followers: 1)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 7)
Assembly Automation     Hybrid Journal   (Followers: 2)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access   (Followers: 1)
Australasian Journal of Engineering Education     Hybrid Journal   (Followers: 3)
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Hybrid Journal   (Followers: 2)
Autocracy : Jurnal Otomasi, Kendali, dan Aplikasi Industri     Open Access  
Automotive and Engine Technology     Hybrid Journal  
Automotive Experiences     Open Access  
Automotive Innovation     Hybrid Journal   (Followers: 1)
Avances en Ciencias e Ingenierías     Open Access  
Avances: Investigación en Ingeniería     Open Access   (Followers: 6)
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 2)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 6)
Batteries     Open Access   (Followers: 11)
Batteries & Supercaps     Hybrid Journal   (Followers: 7)
Bautechnik     Hybrid Journal   (Followers: 3)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 29)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 14)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 6)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 6)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 8)
Biomicrofluidics     Open Access   (Followers: 7)
Biotechnology Progress     Hybrid Journal   (Followers: 44)
Black Sea Journal of Engineering and Science     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 15)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access   (Followers: 1)
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 50)
Carbon Resources Conversion     Open Access   (Followers: 3)
Carpathian Journal of Electronic and Computer Engineering     Open Access  
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 8)
Catalysis Communications     Hybrid Journal   (Followers: 7)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysis Today     Hybrid Journal   (Followers: 8)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
Cell Reports Physical Science     Open Access  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 2)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Journal of Population, Resources and Environment     Open Access  
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 2)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Hybrid Journal   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Hybrid Journal   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 27)
Clay Minerals     Hybrid Journal   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 14)
Coastal Engineering Journal     Hybrid Journal   (Followers: 9)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 2)
Coastal Management     Hybrid Journal   (Followers: 30)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 3)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Color Research & Application     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 17)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 20)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 10)
Composite Structures     Hybrid Journal   (Followers: 334)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 277)
Composites Part B : Engineering     Hybrid Journal   (Followers: 311)
Composites Part C : Open Access     Open Access   (Followers: 3)
Composites Science and Technology     Hybrid Journal   (Followers: 246)
Comptes Rendus : Mécanique     Open Access   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 20)
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 21)

        1 2 3 4 5 6 7 8 | Last

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AAPG Bulletin
Journal Prestige (SJR): 1.825
Citation Impact (citeScore): 4
Number of Followers: 11  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0149-1423
Published by GeoScienceWorld Homepage  [19 journals]
  • Geological parameters controlling the bedding-parallel vein distribution
           in Vaca Muerta Formation core data, Neuquén Basin, Argentina

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      Authors: Larmier S; Zanella A, Lejay A, et al.
      Abstract: ABSTRACTIt is important to understand the occurrence of bedding-parallel veins in the Vaca Muerta Formation because this helps to predict their presence away from well controls so that they can ultimately be incorporated in reservoir simulators and hydraulic fracturing modelers. Given that their occurrence has a significant impact on the propagation of hydraulic fractures, their spatial distribution will help to select sweet spots for unconventional resource development. In this study, we try to identify the key parameters that control bedding-parallel veins. Therefore, detailed sedimentological core descriptions were performed on 10 different wells, including total organic carbon measurements at a spacing of 0.5 cm and several degrees of maturity ranging from 0.7% to 1.8% vitrinite reflectance. Through a comparison between bedding-parallel vein localization and sedimentological descriptions, we built a statistical method to identify key parameters controlling the localization of such veins within the Vaca Muerta Formation. We show that bedding-parallel veins are primarily located at facies boundaries (70%) rather than in homogeneous facies (30%). The major rheological discontinuities, such as ashbeds and calcitic concretion boundaries, as well as organic-rich facies have a significant impact on the localization of both bedding-parallel veins. The total organic carbon seems to influence the generation of bedding-parallel veins by locating these fractures in organic-rich areas with more than 2 wt. % in total organic carbon. We also found a correlation between the degree of maturity of the source rock within a same sequence stratigraphy and the (1) number of bedding-parallel veins and (2) thickness of the bedding-parallel vein, suggesting a strong link between the generation of hydrocarbons during the burial of the rock with the generation and distribution of bedding-parallel veins.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Geological-petrophysical insights in the deep Cambrian dolostone
           reservoirs in Tarim Basin, China

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      Authors: Lai J; Liu S, Xin Y, et al.
      Abstract: ABSTRACTCores, thin sections, and cathodoluminescence analysis were integrated to document the occurrence and petrology of dolomites, and their pore systems in the Cambrian of Tarim Basin, China. Depositional facies, pore types, and dolomitization processes of various dolostone reservoir types are determined. Six types of dolomite are recognized, including microbial dolomite, dolomicrite, fabric-retentive dolomite, fabric-obliterative dolomite, fine to medium crystalline dolomite cement, and saddle dolomite cement. Pore systems are dominantly vugs, anhydrite dissolution pores, intercrystalline pores, intercrystalline dissolution pores, fabric dissolution pores, and microfractures. Four porous dolostone reservoirs include sabkha dolostone, seepage-reflux dolostone, burial dolostone, and hydrothermal dolostone. Fractures are an important factor in enhancing reservoir quality in dolostone reservoirs.  Conventional wire-line logs and image logs are calibrated with cores and related thin sections. Sabkha dolostone reservoirs are characterized by dark and bright spots on the image logs. Seepage-reflux dolostone reservoirs are related to high-energy depositional facies and are characterized by low gamma-ray amplitude, increasing sonic transit time and neutron porosity but reducing bulk density values. Evident dark spots (vugs) are recognized on image logs, and all three porosity logs suggest relatively high reservoir quality in burial dolostone reservoirs. Hydrothermal dolostone reservoirs are recognized by high gamma-ray response caused by hydrothermal minerals (fluorite), and porosity curves indicate good reservoir quality, which is supported by dark spots (vugs) on the image logs. Rapid decrease in resistivity, increasing in sonic transit time values, and the dark sinusoidal waves on the image logs are typical of fractured dolostone reservoirs. The distribution of dolostone reservoirs in each well is predicted using a comprehensive analysis of conventional and image logs, and they are calibrated with oil test data. The research provides insights in the analysis of genetic model of deeply buried dolostone reservoirs and establishes the predictable model for reservoir quality in dolostones via well logs.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Miocene seismic stratigraphy and geomorphology of Bibiyana gas field,
           Surma Basin, Bangladesh

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      Authors: Ehman KD; Lisi AF, Kowalik WS, et al.
      Abstract: ABSTRACTAn integrated approach using a three-dimensional (3-D) seismic survey over the Chevron-operated Bibiyana field in Bangladesh along with petrophysical well data and cores provides new insights into the stratigraphic development of the Miocene–early Pliocene Ganges Delta. From this, a sequence stratigraphic model was constructed for the Bibiyana field that more accurately depicts the internal architecture of the reservoir units of the field. As of 2019, Bibiyana field was producing approximately 1.3 billion SCF/day of gas and accounted for more than 45% of Bangladesh’s daily gas supply.The 3-D seismic volumes covering the field area were stratigraphically flattened using multihorizon seismic flattening techniques. The well-log data were also flattened to enable the wells to be tied and visualized within the flattened domain. Core data from the field were examined, interpreted, and integrated into the stratigraphic model.Reservoirs at Bibiyana are divided into a series of sequence stratigraphic units, each recognized by a seismically defined sequence boundary at both the base and the top of the units. Two types of major reservoir sandstones were observed: (1) erosional remnants of shallow-marine, tidal sandstones below sequence boundaries and (2) channel sandstones at the base of incised canyons above sequence boundaries. The focus of this investigation was on the architecture of the main reservoir known as the BB60 series (Miocene Bokabil Formation), containing approximately 50% of the field reserves. The BB60 series reservoir is an erosional remnant below a major sequence boundary (SB60) sealed by the thick canyon-fill prodelta shale of the BB55 interval. Channelized sandstones and associated mass transport deposits are present locally at the base of the canyon and have reservoir properties that contrast with the underlying and adjacent shallow-water, tidal-dominated deltaic sandstones of the BB60 reservoir. Multihorizon flattening of the seismic and well data in concert with 3-D visualization reveals the complexly eroded canyon system, incised into the underlying tidal deltaic deposits of the BB60 series.Similar erosional patterns are present in the underlying BH series reservoirs (Miocene Bhuban Formation), and the conceptual model developed for the BB60 reservoir can be applied and aide the understanding of the deeper reservoirs that are less well imaged by the existing seismic data.The recognition that unconformities with overlying canyon-fill shales seal many of the reservoirs at Bibiyana is critical in understanding and modeling the reservoir architecture and performance over time.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Seismic interpretation workflows for deep-water systems: A practical guide
           for the subsurface

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      Authors: Mayall M; Kneller B.
      Abstract: ABSTRACTEffective exploration, appraisal, and development of deep-water reservoirs require systematic mapping, description, and characterization of the depositional systems that host them. Success in these areas requires that there is a firm understanding of hydrocarbon volumes and uncertainties, facies distributions to locate exploration and appraisal wells, and a framework to build reservoir models. We present a practical seismic interpretation workflow methodology that will be applicable in most cases and with most seismic data sets. The workflows are for channels, sheets, and mass transport deposits (MTDs). Each step of the workflow is illustrated with subsurface and/or outcrop examples. The channel workflow guides the interpreter through identification of three hierarchical levels of channel architecture and the recognition of six key seismic facies: channel axis, channel margin, basal lags, slumps, thin-bedded facies (internal levees and terraces), and external levees. The sheet sandstone workflow emphasizes a series of steps including understanding the regional and local context, understanding the evolution of seafloor topography at basinal and depositional scales, and generating detailed amplitude maps. Mass transport complexes are rarely reservoirs but can have a major impact on reservoir distribution. The workflow encourages inquiries into these impacts, which include potential erosion of underlying reservoirs, ponding on and around the MTD, diversion and deflection of subsequent reservoir-hosting depositional systems, and their potential as sealing facies. The workflows are designed to be efficient and practical and will provide an appropriate characterization encompassing exploration and appraisal to early development phases.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Seismic-stratigraphic interpretation and modeling of offshore synrift and
           postrift Cretaceous sequences in the Kribi-Campo subbasin, southern
           Cameroon

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      Authors: Yugyè J; Ngos S, III, Angoua Biouélé S, et al.
      Abstract: ABSTRACTThe interpretation of the two-dimensional regional seismic lines covering the offshore of the Kribi-Campo subbasin allows the identification of one aggrading synrift depositional sequence (SS1) of Barremian'–Aptian age and three postrift prograding depositional sequences (SS2, SS3, and SS4) of Albian–Maastrichtian age. The seismic sequences SS1, SS2, SS3, and SS4 correspond, respectively, to the Lower Mundeck, Upper Mundeck, Logbadjeck, and Logbaba Formations. These sequences are bounded respectively by erosional unconformities (H1, H2, H3, H4, and H5). These erosional unconformities are designed in three-dimensional geological models that define the paleotopography of the Kribi-Campo subbasin. The sediment supply is mostly continental, transported by coastal paleorivers, and grouped into three depositional systems: (1) deltaic, fan-delta, and platform facies; (2) neritic; and (3) bathyal. Synrift sequence (SS1) and Cretaceous postrift sequences (SS2, SS3, and SS4) are affected by northwest-southeast unidirectional submarine canyons that are perpendicular to the paleoshelf margin. Several trap types are present in the study area, including structural traps associated with antithetic faults, rollover anticlines bounded by listric faults, and combination traps associated with salt diapirs and compressive structures.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Pore structure evolution characteristics of continental shale in China as
           indicated from thermal simulation experiments

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      Authors: Gao Z; Xuan Q, Hu Q, et al.
      Abstract: ABSTRACTOrganic matter (OM) pores in shale can provide abundant storage space for gas. However, there are different types of OM with different compositions and structures in continental shale, and their pore structure evolution lacks direct observations. In this study, anhydrous thermal simulation experiments in an open system were conducted on a continental Jurassic Ziliujing Formation shale sample with a low initial thermal maturity, taken from an outcrop in the northeastern Sichuan Basin. Changes in the pore structure of a specific OM at different thermal maturities were captured by field emission–scanning electron microscopy (FE-SEM). These FE-SEM images processed by image processing software were combined with N2 adsorption and high-pressure mercury intrusion porosimetry data to help clarify the pore structure evolution characteristics. Our results show that OM developed in Ziliujing Formation shale can be divided into four types based on their morphological characteristics. The pore structure evolution process is closely related to the processes of petroleum generation, migration, and thermal cracking. More specifically, the filling of pores by generated oil at lower temperature caused a decrease of the macropore volume in the shale sample and these filled macropores were released at higher temperature by thermal cracking of oil. In addition, there were no OM pores larger than 10 nm created during thermal simulation experiments, which indicates that the development of such sized OM pores is largely dependent on the original composition and structure of the parent OM.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • A comparison of three-dimensional–printed porous rocks with nano x-ray
           computed tomography: Silica sand, gypsum powder, and resin

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      Authors: Kong L; Ostadhassan M, Liu B, et al.
      Abstract: ABSTRACTTo date, a variety of three-dimensional (3-D) printing methods and materials have been used to replicate natural rocks, yet no study has compared their outputs. Such work can enable us to select the most appropriate printing technique and material combinations to ensure better results when natural rocks are substituted with replicas. The present study compares binder jetting and stereolithographic (SLA) 3-D printing methods in the manufacturing of a porous rock model. The materials employed are gypsum powder and silica sand for the binder jetting technique and resin for the SLA method. First, a digital rock model based on Berea Sandstone was created with computed microtomography imaging; then the image was printed using the aforementioned methods and materials. The replicas were examined by computed nanotomography imaging to compare the resemblance of internal pore structures to the natural specimen. It was found that powder-based printing with gypsum created an output that was comparable only on the exterior parts to the reference model, silica sand failed in the interior boundaries because of loosely packed particles, and the resin-based model was the most similar to the reference in terms of pore shape and geometry. Ultimately, this study should help lay out general guidelines in selecting appropriate purpose-based printing techniques and materials to benefit the field of geosciences.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Understanding lateral and vertical fluid variations in the Pliocene
           sandstone reservoirs in the eastern South Caspian Basin

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      Authors: Mehay S; Hashem M, Rouis L, et al.
      Abstract: ABSTRACTThe South Caspian Basin hosts more than 600 onshore and offshore oil and gas fields characterized by large variations in fluid properties impacting field development and nearby exploration efforts. A total of 32 surface and downhole fluid samples collected from six distinct Pliocene sandstones in an offshore anticline field in the eastern South Caspian Basin were analyzed (gas, light- and midrange–fraction composition, biomarkers, and bulk and gas compound-specific carbon isotopes) to investigate the processes controlling the fluid properties at the field scale. Sampling and sample handling methodologies enabled preservation and recovery of representative light-end compositions.  Lateral fluid property variations within the main productive sandstone reservoir (API gravity from 36.8° to 53.4° and gas–oil ratio from 544 to 947 SCF/bbl) were found to result from the combined effects of biodegradation, water washing, and a light charge contribution, the latter having the predominant impact on the observed fluid properties variations. Ongoing migration of higher-maturity fluids generated deeper in the South Caspian Basin or evaporative fractionation, which likely affected fluids in the deeper sandstones, may be responsible for the contribution of a volatile enriched charge to the shallow reservoirs. A comparison based on source and maturity diagnostic parameters with Pliocene reservoir oils from the western South Caspian Basin is consistent with a similar reservoir filling history but more complex migration pathways for the eastern South Caspian Basin reservoirs.
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
  • Chemostatistic allocation of shale oil production using acidic
           heterocompounds

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      Authors: Han Y; Horsfield B, Mahlstedt N, et al.
      Abstract: ABSTRACTHydraulic fracturing is routinely used to release and produce petroleum from multistacked shale layers. Although it is known that some shale layers are more productive than others, actually allocating produced oil volumes to individual reservoirs is difficult. In this paper, we introduce a new allocation technique that is based on the heterocompounds (nitrogen-, sulfur-, and oxygen-containing) detected by electrospray negative-ion ESI(−) Fourier transform ion cyclotron resonance mass spectrometry. A total of 2 oils and 5 mixtures thereof prepared in the laboratory, 4 produced oils and 2 shale bitumens extracted from the Vaca Muerta Formation (Argentina), and 5 produced oils and 15 shale bitumens extracted from the Niobrara Formation were used to test and illustrate the utility of the newly developed technique. The allocation results show a good match to conventional geochemistry indices based on gross polarity fractions, C27-28-29 diasteranes, pristane, and phytane. The chemostatistic allocation method is capable of deconvoluting the contributions of individual shale layers using bitumen extracts and is not influenced by fractionation. The newly developed allocation technique can assist in the rapid development of multistacked shale reservoirs. Allocating point source or genetic contribution to a conventional oil play is another potential application (i.e., oil-source correlation).
      PubDate: Mon, 01 Nov 2021 00:00:00 GMT
       
 
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