Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
This study integrates different geochemical analyses (chemical compositions, carbon isotopes) and a physical mixing model to quantitatively identify gas sources and migration mechanisms in the Nanchuan No.2 coal mine. Results reveal distinct isotopic signatures: gases from mine-out area exhibit intermediate δC values (- 55.1‰ to - 49.6‰) between coal-seam methane (avg. δC = - 61.0‰) and Yanchang oil-type gas (avg. δC = - 49.7‰), indicating mixed origins. The mixing model quantifies oil-type gas contributions to goaf emissions as 74.3% (methane) and 75.5% (ethane), dominated by vertical migration from Triassic Yanchang Formation source rocks through mining-induced fractures. Low coal-seam gas content (avg. 0.97 m³/t) further supports external hydrocarbon influx. Structural heterogeneity in oil-type gas distribution correlates with spatial variations in contribution ratios (52.7-100%). Mining disturbances disrupt caprock integrity, creating pressure-relief pathways that drive gas migration via fracture networks. This work establishes a framework for optimizing gas control strategies in coal-oil-gas symbiotic systems, emphasizing the critical role of isotopic tracing in hazard mitigation.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12287473 | PMC |
| http://dx.doi.org/10.1038/s41598-025-10816-2 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Quantitative sources identification of gas emissions in mined-out area of coal seams in the Huanglong coalfield of the Ordos Basin, China.
Sci Rep
July 2025
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China.
This study integrates different geochemical analyses (chemical compositions, carbon isotopes) and a physical mixing model to quantitatively identify gas sources and migration mechanisms in the Nanchuan No.2 coal mine. Results reveal distinct isotopic signatures: gases from mine-out area exhibit intermediate δC values (- 55.
View Article and Find Full Text PDFCompilation and standardization of oil toxicity data on early life stages of fish to support population-level oil spill impact modeling.
Aquat Toxicol
September 2025
University of Helsinki, Fisheries and Environmental Management Group, Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, P.O Box 65, Viikinkaari 1, P, Helsinki, FI-00014, Finland.
The risk of oil spills has increased in recent years due to rising tanker traffic and the emergence of poorly maintained vessels. While the environmental impacts of oil spills are wide-ranging, their effects on fish populations remain contested, prompting the need for further research and the development of improved tools and methodologies for impact assessment. One complicating factor is the heterogeneity of existing laboratory exposure data, which hinders their usage in population-level oil spill impact assessment.
View Article and Find Full Text PDFRemaining Oil Distribution Characteristics and Potential Tapping Strategies for Integral Reservoirs at Different Waterflooding Stages.
ACS Omega
July 2025
Shengli Oil Production Plant, Shengli Oilfield Company, Sinopec, Dongying, Shandong 257000, China.
Insufficient or ambiguous understanding of remaining oil distributions at different waterflooding stages probably leads to low efficiency or ineffective injection water circulation at the late stage of waterflooding in integral reservoirs. In our work, numerical simulation of waterflooding of typical formation in integral reservoirs was performed, and the remaining oil distributions at varied waterflooding stages were characterized by the "Four-points and Five-types" classification method, and then corresponding potential tapping strategies were proposed to finally enhance recovery at the waterflooding late stage. Results show that the remaining oil type is enriched oil at the stage of low-medium-high water cut (60%-80%), and potential tapping strategies are a subdivision of the stratum series, adjustment of the injection-production well network, and infilling and improving the well network; at the stage of a super-high water cut (90%), high water-consuming oil (HWC oil) and super-high water-consuming oil (SHWC oil) are the main remaining oil types, and potential tapping strategies are changing the direction of the flow field, adjusting the injection-production well pattern, and optimizing the well network; at the late stage of a super-high water cut (≥95%) with high water consumption, the remaining oil is mainly the super-high water-consuming one, and potential tapping strategies are flow line adjustments + chemical flooding, gas flooding, etc.
View Article and Find Full Text PDFSelf-Assembly at Oil-Water Interfaces Driven by Solubility Differences and Polar-Hydrophobic Interactions: An Insight into a Highly Mechanical Performance Gel with Gradients.
Langmuir
April 2025
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China.
Interfacial self-assembly offers a promising route to fabricate functional materials, yet achieving robust mechanical performance remains challenging. Here, the self-assembly of nonionic surfactant polyoxyethylene monoalkyl ether (AEO-9) at oil-water interfaces was systematically investigated to form a high-strength interfacial gel. During the self-assembly process, the mechanical strength of the interfacial gel progressively increased, reaching a maximum equilibrium value of 4200 Pa after 24 h.
View Article and Find Full Text PDFAdsorption-induced negative carbon isotope sequence in over-mature coal-type gas from the southwest Ordos Basin.
Sci Rep
April 2025
Hubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environments, Yangtze University, Wuhan, 430100, China.
The carbon isotope sequence of alkanes is a key indicator used to distinguish organic from inorganic gas. A negative carbon isotope sequence (i.e.
View Article and Find Full Text PDF