Journal of Energy and Power Technology (JEPT) is an international peer-reviewed Open Access journal published quarterly online by LIDSEN Publishing Inc. This periodical is dedicated to providing a unique, peer-reviewed, multi-disciplinary platform for researchers, scientists and engineers in academia, research institutions, government agencies and industry. The journal is also of interest to technology developers, planners, policy makers and technical, economic and policy advisers to present their research results and findings.

Journal of Energy and Power Technology focuses on all aspects of energy and power. It publishes not only original research and review articles, but also various other types of articles from experts in these fields, such as Communication, Opinion, Comment, Conference Report, Technical Note, Book Review, and more, to promote intuitive understanding of the state-of-the-art and technology trends.

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Publication Speed (median values for papers published in 2023): Submission to First Decision: 5.1 weeks; Submission to Acceptance: 11.6 weeks; Acceptance to Publication: 7 days (1-2 days of FREE language polishing included)

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Special Issue

Where to Drill? -- Measuring Percolation Flow Systems in Critical State Geothermal Reservoirs

Submission Deadline: June 30, 2021 (Closed) Submit Now

Guest Editor

Peter Leary, PhD

GeoFlow Imaging, Auckland, New Zealand.

Website | E-Mail

Research Interests: Applied physics of rock-fluid interaction in crustal reservoirs

About This Topic

Recent innovations in surface seismic array data processing have allowed 25m-resolution mapping of large-scale spatially erratic percolation pathways during the production of hydrocarbon-bearing shale formations. Parallel observation of deep basement microseismicity stimulated by controlled injection of fluid reveals that injected fluids induce seismic slip on existing permeability structures rather than generate fresh fracture-flow conduits. Together these observations imply that convective fluid flow in geothermal systems naturally emits seismic energy whose localised spatial origin can be measured with sufficient accuracy to allow targeted drilling of geothermal brownfield and greenfield sites. Targeted drilling of spatially erratic convective flow systems can greatly reduce the drilling cost overhead that currently hinders development of geothermal power production.

The scientific support for acquiring and interpreting seismic data associated with convective geothermal flow structures follows from the unique material properties of crustal rock. First, the Fourier fluctuation power of crustal porosity Sφ(k) scales inversely with spatial frequency k, Sφ(k) ~ 1/k over five decades of scale length, 1/km < k < 1/cm; the physical origin of this ‘’1/f-noise’’ scaling arises from a thermodynamic order-disorder phase change in crustal rock taken as a binary population of grain-scale fluid flow/no-flow poro-site deformation energetics. Second, crustal permeability is controlled by porosity as κ(x,y,z) ~ exp(αφ(x,y,z)), where the empirical parameter α is sufficiently large that permeability is lognormally distributed; all crustal fluid extraction well productivity distributions are lognormal; further, reservoir microseismic magnitude distributions are lognormal. A third observational support is that crustal permeability and reservoir microseismicity distributions are internally spatially correlated according to the two-point correlation function Γ(r) ~ 1/r1/2. Physically relevant numerical modelling of fluid flow in crustal rock requires embedding these spatial distributions at all scales within the computational volume.

The critical-state material spatial correlation complexity of crustal flow systems means that to improve drilling efficiency geothermal reservoir operators must locate large-scale flow structure drilling targets with sufficient resolution rather than rely on statistical inferences from low resolution data. The volcanic terrains of most convective geothermal flow systems create problems for seismic measurements. We invite contributions that address the acquisition, processing, and interpretation of seismic data leading to systematic location of major convective geothermal flow structures as drilling targets.

Keywords

crustal reservoir flow; crustal fractures; microseismicity; crustal critical state.

Manuscript Submission Information

Manuscripts should be submitted through the LIDSEN Submission System. Detailed information on manuscript preparation and submission is available in the Instructions for Authors. All submitted articles will be thoroughly refereed through a single-blind peer-review process and will be processed following the Editorial Process and Quality Control policy. Upon acceptance, the article will be immediately published in a regular issue of the journal and will be listed together on the special issue website, with a label that the article belongs to the Special Issue. LIDSEN distributes articles under the Creative Commons Attribution (CC BY 4.0) License in an open-access model. The authors own the copyright to the article, and the article can be free to access, distribute, and reuse provided that the original work is correctly cited.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). Research articles and review articles are highly invited. Authors are encouraged to send the tentative title and abstract of the planned paper to the Editorial Office (jept@lidsen.com) for record. If you have any questions, please do not hesitate to contact the Editorial Office.

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