Results 31 to 40 of about 1,554 (171)

From NMR Signals to Fracture Size: Capillary-Controlled Conversion for Shale

Magnetochemistry
Fracture size governs fluid mobility in shale, yet its direct quantification remains challenging. Nuclear Magnetic Resonance (NMR) transverse relaxation time (T2) offers a unique, non-destructive probe of fracture size distributions; however, a ...
Xu Dong, Wenqi Shi, Xueying Shi, Peidong Liu, Jiahui Zhang, Zhiyuan Chen, Jingjie Zhang   +6 more
doaj   +1 more source

Separating Environmental Modulation From Source Intermittency in Methane Leakage From a Legacy Well in British Columbia

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract Legacy oil and gas wells are an incompletely quantified source of greenhouse gas emissions and offer leakage pathways for subsurface gas migration if inadequately isolated. We present a high‐resolution, process‐based characterization of leakage dynamics at an integrity‐compromised legacy gas well in northeastern British Columbia using five ...
Benjamin Pullen, Aaron G. Cahill
wiley   +1 more source

Machine Learning Approaches for Predicting Total Organic Carbon From Petrophysical Well Logs in the Wufeng–Longmaxi Shale, Southeast Sichuan Basin, China

Geoscience Data Journal, Volume 13, Issue 4, October 2026.
This study demonstrates the application of machine learning models—Random Forest, XGBoost, and Multiple Linear Regression—to predict Total Organic Carbon (TOC) from well logs, significantly improving TOC prediction accuracy and reliability across diverse geological settings compared to traditional log‐based methods.
Haseeb Ahmad, Jiang Shu, Naveed Rehman, Muhammad Asad, Muhammad Tariq, Aqib Saeed, Attiqullah Ayaz   +6 more
wiley   +1 more source

A Comparison of Screening Methods for Assessing Legacy Wells Within CO2 Storage Licences: Application to Offshore Norway

Greenhouse Gases: Science and Technology, Volume 16, Issue 5, Page 746-757, October 2026.
ABSTRACT Legacy wells represent a critical consideration for offshore CO2 storage projects, as they may provide potential pathways for fluid or gas migration if poorly constructed, undocumented or inadequately abandoned. Systematically assessing large numbers of legacy wells remains challenging due to heterogeneous data availability and the diversity ...
Benjamin Emmel, Ole‐Andre Roli, Maxence Vergne, Guilhem Hauguel, Bastien Dupuy   +4 more
wiley   +1 more source

A lithology identification method for continental shale oil reservoir based on BP neural network [PDF]

Journal of Geophysics and Engineering, 2018
The Dongying Depression and Jiyang Depression of the Bohai Bay Basin consist of continental sedimentary facies with a variable sedimentary environment and the shale layer system has a variety of lithologies and strong heterogeneity. It is difficult to accurately identify the lithologies with traditional lithology identification methods.
Luo Han, Lai Fuqiang, Dong Zheng, Xia Weixu   +3 more
openaire   +1 more source

High-Precision Density Log Reconstruction Method Based on the RF-Transformer Algorithm

Applied Sciences
Under the backdrop of digital subsurface and intelligent field development, together with sustainable development planning, reliable and continuous well-log measurements are increasingly essential for reservoir evaluation and geological interpretation ...
Junlei Su, Xu Dong, Yu Zeng, Peidong Liu, Xueying Shi, Wenqi Shi   +5 more
doaj   +1 more source

Quantifying Natural Hydrogen‐Helium Sources and Dynamic Accumulation in Global Sedimentary Basins

Earth's Future, Volume 14, Issue 10, October 2026.
Abstract Despite the scientific and economic importance of hydrogen and helium, their crustal budgets remain poorly quantified. This study systematically assesses the accumulation of natural hydrogen and helium in global sedimentary basins by integrating predictive models for both gases with H2/He ratios.
Yongbo Wei, Quanyou Liu, Thomas J. Algeo, Dongya Zhu, Qingqiang Meng, Huiyuan Xu, Wang Zhang, Xiaoqi Wu, Pengpeng Li, Xiaowei Huang, Yin Fu, Yicheng Mou, Di Zhu, Ziqi Feng, Huaiwei Ni, Fang Hao, Zhijun Jin   +16 more
wiley   +1 more source

Research and application of 3D attribute fusion technology based on lithology probability analysis

Scientific Reports
To address the challenges of seismic attribute selection and the low accuracy of characterizing single-phase river channels with a single seismic attribute, a 3D seismic attribute fusion technology based on lithology probability curve analysis has been ...
Shanyi Zhang, Xueying Li, Jinyu Lan, Dejian Zhang, Lin Cong, Yaning Shi   +5 more
doaj   +1 more source

Subsurface Hydrocarbon Biodegradation in the Context of Microbial Habitability and Hydrogeologic, Thermal, and Geologic Evolution of the Colorado Plateau

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 10, October 2026.
Abstract Subsurface microbial ecosystems associated with hydrocarbon reservoirs are shaped by temperature, salinity, redox gradients, and fluid flow. However, the drivers of microbial activity and hydrocarbon biodegradation over geologic timescales remain poorly constrained.
Meera P. Shah, Jennifer McIntosh, Peter Reiners, Lydia Bailey, Bradley S. Stevenson, Grant Ferguson, Ji‐Hyun Kim, Henrik Drake, Magdalena R. Osburn   +8 more
wiley   +1 more source

Geochemical Characteristics and Paleoenvironmental Reconstruction of the Cretaceous Qingshankou Formation Shales in the Southeastern Uplift of the Songliao Basin: A Case Study from the Niaohexiang Section of Binxian, China

Applied Sciences
The Qingshankou Formation shales in the southeastern uplift of the Songliao Basin provide an ideal archive for constraining the controls of paleoenvironment on organic matter enrichment.
Yangxin Su, Xiuli Fu, Hongjun Shao, Qinghai Xu, Kun Wang, Qiang Zheng   +5 more
doaj   +1 more source