Results 41 to 50 of about 64,238 (294)
Frontiers in Earth Science, 2022 This paper presents an integrated paleomagnetic, rock magnetic and geochemical study of the Devonian Antrim shale in the Michigan Basin. Specimens were obtained from two unoriented vertical cores (named St.
Gerhard Heij, Richard Douglas Elmore
doaj +1 more source
Interpretation of Nitrogen Isotope Profiles in Petroleum Systems: A Review
Frontiers in Earth Science, 2021 Bulk sedimentary nitrogen isotope profiles are often used as proxies for depositional redox conditions, nitrogen cycling, and nutrient uptake in modern and ancient marine systems. The general preference in terms of analysis is that the sediments measured
Tracy M. Quan, Oyeleye O. Adeboye
doaj +1 more source
New organic matter degradation proxies: Valid in lake systems? [PDF]
, 2004 We determined concentrations and diagenetic state of organic matter in two cores from Lake Zug, Switzerland. To obtain a general picture of organic matter decay in the lake, we measured bulk parameters such as total organic carbon, total nitrogen, and ...
Cowie, G. L. +4 more
core +1 more source
Journal of Natural Gas Geoscience, 2018 The distribution of high-quality reservoirs in Shahejie Formation of the Shijiutuo Uplift, Central Bohai Sea, is the key factor to determine the oil and gas accumulation.
Zhengxiang Lv +4 more
doaj +1 more source
Frontiers in Earth Science, 2023 Although the Ordovician petroleum exploration in the Sichuan Basin has been developed slowly for a long time, deepening the research of reservoir characteristics and genesis is still a robust way to accelerate it.
Li Zhou +9 more
doaj +1 more source
Evaluating the influence of lake morphology, trophic status and diagenesis on geochemical profiles in lake sediments [PDF]
, 2010 Recent geochemical studies provide evidence that changes in vertical distributions of nutrients in lake sediments are driven by anthropogenic activities, based primarily on trends of increasing concentrations in upper sediment layers.
Hamilton, David P. +2 more
core +2 more sources
Deep Underground Science and Engineering, EarlyView.This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu +8 more
wiley +1 more source
Gold in Devono-Carboniferous red beds of northern Britain [PDF]
, 2015 We are grateful to D. Craw and an anonymous reviewer for comments that helped to clarify the paper.
Bellis, David +3 more
core +1 more source
Energy Science &Engineering, EarlyView.On the basis of core and log data, a Bayesian‐Optimized Random Forest model achieved 92.76% accuracy in classifying tight sandstone reservoirs. A gray relational analysis‐derived evaluation index shows > 80% consistency with actual gas zones. ABSTRACT Tight sandstone gas (TSG), an unconventional oil–gas resource, has heterogeneous reservoirs ...
Yin Yuan +8 more
wiley +1 more source
Greenhouse Gases: Science and Technology, EarlyView.ABSTRACT Reliable characterization of mineralogical and textural changes in rock samples is essential for understanding fluid–rock interactions, particularly in experimental studies simulating subsurface conditions. This study presents a reproducible protocol for scanning electron microscopy (SEM) analysis of rock surfaces before and after exposure to ...
Berta Ordóñez‐Casado +3 more
wiley +1 more source