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Innovations in Exploration and Energy Conversion Pathways of Unconventional Hydrocarbon Reservoirs

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H1: Petroleum Engineering".

Deadline for manuscript submissions: 5 June 2026 | Viewed by 1758

Special Issue Editor


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Guest Editor
Bob L. Herd Department of Petroleum Engineering, Texas Tech University, Lubbock, TX 79414, USA
Interests: natural hydrogen; vibrations; drilling system control; AI in geosience; unconventional reservoir evaluation
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Special Issue Information

Dear Colleagues,

This Special Issue invites contributions that advance exploration strategies, production technologies, energy storage, and monitoring for conventional, unconventional, geothermal, and natural hydrogen systems. We welcome experimental, numerical, field, and review papers that strengthen the energy chain for unconventional resources and related subsurface–surface energy infrastructures, with emphasis on process performance, diagnostics, and operability.

In light of the current global sustainable transition and the pressing challenges surrounding energy and climate change, this Special Issue also seeks research addressing the sustainability pathways and policy–technology interfaces of energy systems. Studies linking energy technologies with environmental impact mitigation, carbon management, and sustainable energy transition are particularly encouraged.

We particularly encourage studies that bridge subsurface exploration and production with surface conversion and storage (e.g., compression, purification, power-to-hydrogen, hydrogen-to-power), as well as grid and microgrid integration, control and optimization, and energy systems analysis.

Topics of interest include, but are not limited to, the following:

  • Exploration and production technologies for energy supply: drilling and completion innovations, production optimization, flow assurance, and wellbore/production system modeling oriented to energy performance.
  • Hydrogen energy chain: subsurface sourcing (including natural hydrogen), conditioning, compression and purification, transport, and underground storage (salt caverns, depleted reservoirs) with a focus on efficiency, reliability, and operability.
  • Energy conversion and integration: power-to-hydrogen, hydrogen-to-power, coupling with CCS/CCUS and geothermal heat-to-power; balance-of-plant and surface facilities supporting conversion efficiency.
  • Thermodynamics, heat/mass transfer, and entropy analyses of exploration, production, and conversion processes; performance maps and sensitivity studies.
  • Diagnostics, monitoring, and control for energy conversion chains: online sensing, model-based and data-driven fault detection, prognostics, and real-time optimization.
  • Artificial intelligence in energy systems design and control: forecasting, optimization, physics-informed learning, and data assimilation for production and conversion assets.
  • Energy, environment, and sustainability: life-cycle assessments, carbon footprint analyses, emission reduction technologies, and strategies for sustainable transition in energy systems.
  • Energy and climate change: resilience of energy systems under climate constraints, adaptation and mitigation technologies, and environmental impacts of exploration and conversion activities.
  • Energy storage and systems: coupling with batteries/fuel cells/PCS, microgrids and smart grids, dispatch strategies, and ancillary services.
  • Comparative reviews across conventional, unconventional, geothermal, and natural hydrogen developments from the standpoint of energy technology and conversion performance.

Submission types can include reviews, research articles, and communications. Full experimental details, model descriptions, and sensitivity analyses are highly recommended to ensure reproducibility.

Dr. Mohamed Zinelabidine Doghmane
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • exploration and production technologies
  • energy conversion and integration
  • artificial intelligence in energy systems
  • hydrogen production and storage
  • energy chain

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Published Papers (2 papers)

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Research

22 pages, 2100 KB  
Article
Oil Production, Net Energy, and Capital Dynamics: A System-Coupled Lotka–Volterra Approach
by Shunsuke Nakaya and Jun Matsushima
Energies 2026, 19(7), 1607; https://doi.org/10.3390/en19071607 - 25 Mar 2026
Viewed by 512
Abstract
Net energy—defined as the energy remaining after accounting for the energy required for resource extraction and processing—shapes the fundamental physical constraints of energy systems. Although the extended Energy Return on Investment (EROIext) incorporates extraction, refining, transportation, and end-use infrastructure, its long-term structural dynamics [...] Read more.
Net energy—defined as the energy remaining after accounting for the energy required for resource extraction and processing—shapes the fundamental physical constraints of energy systems. Although the extended Energy Return on Investment (EROIext) incorporates extraction, refining, transportation, and end-use infrastructure, its long-term structural dynamics remain underexplored. This study applies a Single-Cycle Lotka–Volterra (SCLV) model to examine interactions between resource stock, capital accumulation, and EROIext in the global petroleum system. The model is calibrated using historical data from 1965 to 2012 to explore structural trajectories under simplified assumptions. Results indicate that production peaks endogenously around 2041 within the model framework, while EROIext declines and falls below unity by 2081 under the assumed structural relationships. These years represent model-derived structural outcomes rather than deterministic forecasts. Capital stock reaches its maximum at the same energetic threshold (EROIext = 1), marking an internally generated transition in the resource–capital system. An entropy-based indicator is introduced as a thermodynamic proxy mirroring the decline in energetic efficiency within the modeled subsystem. These findings show how energetic reinvestment constraints generate endogenous peak and threshold behavior in resource-dependent systems. The analysis offers a structural perspective on interactions between depletion, capital accumulation, and net energy under simplified thermodynamic assumptions. These results provide insights into long-term structural constraints of the oil system, which may inform energy planning and policy discussions under conditions of declining net energy availability. Full article
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17 pages, 2126 KB  
Article
An Application Concept of a Mobile Micro-Water Turbine for the Recovery of Energy from the River
by Łukasz Semkło and Andrzej Frąckowiak
Energies 2026, 19(4), 934; https://doi.org/10.3390/en19040934 - 11 Feb 2026
Viewed by 1027
Abstract
This work presents an innovative concept of a mobile micro-water turbine for energy recovery from flood-threatened rivers, combining environmental protection with renewable energy production. In response to the increasing frequency and intensity of floods caused by climate change, the authors propose active utilisation [...] Read more.
This work presents an innovative concept of a mobile micro-water turbine for energy recovery from flood-threatened rivers, combining environmental protection with renewable energy production. In response to the increasing frequency and intensity of floods caused by climate change, the authors propose active utilisation of the kinetic energy of water masses during these events through the installation of mobile water turbines along rivers. Rather than merely mitigating the consequences of floods, the energy from flowing water can be converted into electrical current, and the water can be purified and used for other purposes. The article analyses various solutions for water turbines, including the Kaplan turbine, Banki–Michell turbine, and screw turbine, taking into account their efficiency and ability to adapt to changing flow conditions. For the Biała Lądecka river, it was demonstrated that a mobile micro turbine operating for three days can generate a significant amount of energy for on-site consumption or storage. The key challenge is the development of effective water filtration and treatment systems to remove pollutants brought by floods, as well as mobile platforms enabling rapid assembly and disassembly of turbines at threatened sites. The comparative analysis of turbines conducted makes it possible to determine the optimal choice for mobile systems due to operation at low heads, simple construction facilitating installation, and tolerance for contaminants. Full article
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