Diagenetic facies, volcanic tuffaceous sediment, and its diagenetic features in deeply buried tight sandstone, Shan 2 and He 1 Members, Ordos Basin, China
Available online 17 October 2025
Understanding diagenetic processes plays a crucial role in evaluating the quality of tight reservoirs. In this study, we aimed to examine diagenetic facies and thereby assess reservoir quality by conducting...
Coal permeability evolution under coupled mining disturbance and gas extraction conditions: An experimental study
Available online 15 October 2025
This study investigates the evolution of coal permeability under mining-induced stress and gas extraction, a key factor for safe and efficient coal seam gas recovery. A simplified triaxial stress path...
Gas compositional and isotopic variation during desorption of middle-upper Permian shales in western Hubei, Southern China
Available online 15 October 2025
Significant progress has been made in exploring shale gas resources in the middle-upper Permian strata of western Hubei. However, the unclear geochemical characteristics and origins of the gas have...
Seismic sedimentological-based quantifications of late-cretaceous hydrocarbon-bearing late-aggradational lowstands prograding wedges in the Indus basin: Frequency-controlled porosity-constrained dynamic simulations
Available online 11 October 2025
Seismic quantitative reservoir simulations and characterizations have played a vital role in exploring stratigraphic traps, such as late-aggradational lowstands prograding wedge systems (LPWS) within...
Risk assessment and prevention measures for casing deformation in the geological–engineering integration of a block in Jiaoshiba Shale Gas Field
Available online 11 October 2025
Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin, China, and it severely limits the development benefits of shale gas in that block. Based...
Paleo-environmental and geological characteristics of Wufeng-Longmaxi marine shale in different paleo-geomorphological units, Eastern Sichuan Basin, China
Available online 10 October 2025
The Wufeng-Longmaxi marine shale in the Eastern Sichuan Basin is the key target for shale gas exploration in China. Based on logging response and lithofacies type, three paleo-geomorphological units...
Genetic sources of natural gas in new exploration strata in the piedmont area of southwestern Tarim Basin
Available online 10 October 2025
Despite its significant exploration potential, the origin of natural gas in the tectonically complex southwestern Tarim Basin remains controversial due to multiple potential source rocks. This study...
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
August 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...
Quantitative identification method for pores in shale inorganic components based on pixel information
August 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...
Reconstruction of the geothermal field of the Xihu Depression in the East China Sea Basin and its controlling effect on hydrocarbon generation and distribution
August 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...
A simulation study of natural gas injection and storage in a partially depleted oil reservoir for seasonal underground energy storage
August 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...
Permeability evolution mechanism in deep coalbed methane extraction: Considering the competitive effects of adsorption-induced swelling, creep, and aperture compression
August 2025
During gas extraction from deep coal, the rock endures high effective stress, with both the time-dependent deformation and anisotropic structure of the rock controlling the permeability evolution. To...
Characterization of premixed laminar flow combustion with hydrogen doping of the associated gases
August 2025
Hydrogen doping in associated gas combustion presents a promising strategy for mitigating carbon emissions from typically flared or vented gases. To support this idea, this study employed Chemkin Pro...
Damage location prediction of cement-sandstone combinations under axial force: Three-dimensional structure reconstruction and stress distribution simulation based on μ-CT
August 2025
Effective isolation between the cement sheath and the sandstone is crucial for the development and production of oil and gas wells in sandstone formations. In this study, a cement-sandstone composite...
A microfluidic study on the influence of naturally fractured porous media on the phase behavior of condensate gas depletion
August 2025
There are limited quantitative studies on condensate gas using microfluidics under high-pressure and high-temperature conditions. This study employed microfluidics chips based on real porous media structures...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...