A simulation study of natural gas injection and storage in a partially depleted oil reservoir for seasonal underground energy storage
Available online 30 July 2025
The supply of energy is a severe challenge for every country, particularly those that are industrially developed and highly populated. Natural gas is among the most essential energy sources due to its...
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Reconstruction of the geothermal field of the Xihu Depression in the East China Sea Basin and its controlling effect on hydrocarbon generation and distribution
Available online 24 July 2025
The Xihu Depression, situated in the northeastern East China Sea Basin, represents the most significant natural gas-producing region in Eastern China. An insufficient understanding of reservoir heterogeneity...
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Quantitative identification method for pores in shale inorganic components based on pixel information
Available online 18 July 2025
The types and structures of inorganic pores are key factors in evaluations of the reservoir space and distribution characteristics of shale oil and gas. However, quantitative identification methods...
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Numerical assessment of gas production potential via depressurization: Impact of production interval and bottom hole pressure at site NGHP-01-10D of the Krishna-Godavari Basin hydrate reservoir
Available online 15 July 2025
The National Gas Hydrate Program expeditions (NGHP-01 and -02) have conclusively proven the presence of hydrate deposits on the eastern coast of India. The novelty of the present study lies in its investigation...
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An iteration-free approach for determining the average reservoir pressure and original gas in place by production data analysis: Methodology and field cases
June 2025
Current gas well decline analysis under boundary-dominated flow (BDF) is largely based on the Arps' empirical hyperbolic decline model and the analytical type curve tools associated with pseudo-functions....
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CO2 flooding effects and breakthrough times in low-permeability reservoirs with injection–production well patterns containing hydraulic fractures
June 2025
Comprehensive studies on CO2 breakthrough times and flooding effects are crucial for optimizing CO2 flooding strategies. This study utilized numerical simulations to investigate the effects of hydraulic...
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A review of helium resources and development
June 2025
Due to its unique properties, helium is critical in scientific research and industrial innovation, particularly in cryogenics; however, its scarcity necessitates efficient resource utilization. Through...
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The influence of stress and natural fracture on a stimulated deep shale reservoir using the boundary element method
June 2025
Hydraulic fracturing plays a critical role in enhancing shale gas production in deep shale reservoirs. Conventional hydraulic fracturing simulation methods rely on prefabricated grids, which can be...
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Improved equation of state model for the phase behavior of CO2–hydrocarbon coupling nanopore confinements
June 2025
In shale reservoirs, fluids are often confined within nanopores, leading to apparent effects on the properties and phase behavior of the fluid. However, previous studies have primarily focused on the...
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Identification and classification of solid–liquid flow patterns in deviated and horizontal annuli
June 2025
During horizontal well drilling, the interaction between drilling fluid and cuttings entering the annulus generates diverse flow patterns. These solid–liquid two-phase flow patterns must be accurately...
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A technical review of chemical reactions during CCUS-EOR in different reservoirs
June 2025
Geochemical reactions play a vital role in determining the efficiency of carbon capture, utilization, and storage combined with enhanced oil recovery (CCUS-EOR), particularly through their influence...
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Gas occurrence characteristics in marine-continental transitional shale from Shan23 sub-member shale in the Ordos Basin: Implications for shale gas production
June 2025
Pore structure characteristics, gas content, and micro-scale gas occurrence mechanisms were investigated in the Shan23 sub-member marine-continental transitional shale of the southeastern margin of...
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Characteristics of shale reservoir development under the influence of sedimentary differentiation: A case study of the Cambrian Qiongzhusi Formation in the Deyang-Anyue rift trough of the Sichuan Basin
June 2025
The Cambrian Qiongzhusi Formation in the Sichuan Basin harbors significant potential for shale gas harvesting. However, systematic disparities in mineral composition and reservoir architecture have...
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Study on influences of geological and gas source conditions on gas-chimney hydrate accumulation using a reservoir numerical simulation method
June 2025
The Shenhu Area in the South China Sea is rich in oil and gas resources and has many vertical gas chimneys, making it an excellent geological environment for hydrate accumulation. This paper examines...
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Mineral identification in thin sections using a lightweight and attention mechanism
April 2025
Mineral identification is foundational to geological survey research, mineral resource exploration, and mining engineering. Considering the diversity of mineral types and the challenge of achieving...
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Automatic detection and classification of drill bit damage using deep learning and computer vision algorithms
April 2025
This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of Drilling Contractors (IADC) bit wear rating process, which heavily depends on...
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Super-resolution for electron microscope scanning images of shale via spatial-spectral domain attention network
April 2025
The evaluation of adsorption states and shale gas content in shale fractures and pores relies on the analysis of these fractures and pores. Scanning electron microscopy images are commonly used for...
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Stratified allocation method for water injection based on machine learning: A case study of the Bohai A oil and gas field
April 2025
The Bohai A oil and gas field is a natural gas and oil coproduction reservoir in the southern Bohai Sea, with an average gas–oil ratio of approximately 65 m3/m3. The oil and gas field has now entered...
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Integrated wellbore-surface pressure control production optimization for shale gas wells
April 2025
Shale gas wells often face challenges in maintaining continuous and stable production due to their coexistence with high- and low-pressure wells within the same development block, which leads to issues...
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EILnet: An intelligent model for the segmentation of multiple fracture types in karst carbonate reservoirs using electrical image logs
April 2025
Karst fractures serve as crucial seepage channels and storage spaces for carbonate natural gas reservoirs, and electrical image logs are vital data for visualizing and characterizing such fractures....
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Seismic fault identification of deep fault-karst carbonate reservoir using transfer learning
April 2025
Seismic fault identification is a critical step in structural interpretation, reservoir characterization, and well-drilling planning. However, fault identification in deep fault-karst carbonate formations...
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A novel surrogate model with deep learning for predicting spacial-temporal pressure in coalbed methane reservoirs
April 2025
Coalbed methane (CBM) is a vital unconventional energy resource, and predicting its spatiotemporal pressure dynamics is crucial for efficient development strategies. This paper proposes a novel deep...
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An intelligent algorithm for identifying dropped blocks in wellbores
April 2025
Real-time monitoring of wellbore stability during drilling is crucial for the early detection of instability and timely interventions. The cause and type of wellbore instability can be identified by...
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Hybrid genetic algorithm for parametric optimization of surface pipeline networks in underground natural gas storage harmonized injection and production conditions
April 2025
The surface injection and production system (SIPS) is a critical component for effective injection and production processes in underground natural gas storage. As a vital channel, the rational design...
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