Results 181 to 190 of about 146,299 (379)

A study of the optic properties and petrologic significance of zoned sanidines [California] [PDF]

, 1954
K. J. Hsü
openalex   +1 more source

Pore Structure of Tight Sandstones With Different Sedimentary Microfacies in the Chang 6–Chang 9 Layers, Triassic Yanchang Formation, Wuqi Area, Ordos Basin

Energy Science &Engineering, EarlyView.
Taking the Chang 6–Chang 9 layers in the Wuqi area of the Ordos Basin as a case study, this study investigates the pore characteristics of tight sandstones formed under different sedimentary microfacies. The results indicate that tight sandstones associated with distinct sedimentary microfacies exhibit significant variations in pore types, pore size ...
Liling Zhang, Dayou Chen, Liping Rao, Xuan Li, Meng Wang, Wenjian Zhu, Yizhe Wang, Yushuang Zhu   +7 more
wiley   +1 more source

Petrology of potassic alkaline ultramafic and carbonatitic rocks from Planalto da Serra (Mato Grosso State), Brazil

Open Geosciences, 2014
Comin-Chiaramonti Piero, Gomes Celso, Min Angelo, Ruberti Excelso, Girardi Vicente, Slejko Francesca, Neder Renato, Pinho Francisco   +7 more
doaj   +1 more source

Evaluation of Present Tectonic Stress Field and Permeability of Coalbed Methane Reservoirs by Inversion of Logging Data From Longtan Formation, Dahebian Block

Energy Science &Engineering, EarlyView.
ABSTRACT The permeability of coal reservoirs is predominantly controlled by the present tectonic stress field. This study systematically integrates macro‐ and micro‐scale analytical methods to investigate the controlling mechanisms of tectonic stress on pore‐fracture characteristics and permeability in the Longtan Formation coal reservoirs.
Guoqing He, Zhonghu Wu, Wenjibin Sun, Xianchao Yang, Jintao Zhou, Jun Yu, Baofeng Lan   +6 more
wiley   +1 more source

Petrological and Petrochemical Studies of the Granitic Rocks from the Village of Okirai, Kesen-gun, Iwate Prefecture: The Regional Geochemistry of the Okirai District, Kesen-gun, Iwate Prefecture., Part 1

, 1956
Shigeru Okada
openalex   +2 more sources

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the year 1897 [PDF]

, 1898
Hon Charles, D Walcott
openalex   +1 more source

Setting Standards in Petrology: The Commission on Systematics in Petrology [PDF]

Episodes, 1989
openaire   +2 more sources

The Apollo Virtual Microscope Collection: Lunar Mineralogy and Petrology of Apollo 11, 12, 14, 15 and 16 Rocks [PDF]

, 2018
We report on the new Virtual Microscopes on Apollo 16 lunar samples in our Apollo Virtual Microscope ...
Anand, M., Gibson, E. K., Kelley, S. P., Morgan, G. H., Pillinger, J. M., Schwenzer, S. P., Tindle, A. G.   +6 more
core  

Acoustic Emission Time–Frequency Characteristics and Response Mechanism of Damaged Sandstone Under the Influence of Lithology

Energy Science &Engineering, EarlyView.
ABSTRACT Coal seam mining will inevitably cause damage to overlying rock structure, and then affect mine safety production, and even surface ecological environment. This study investigates two types of damaged sandstone samples, prepared through cyclic loading–unloading and uniaxial compression tests.
Zhaohan Zhang, Liming Yin, Dongxiao Zhang, Shudong He, Dongmei Huang, Ruijie Zhang, Lianchun Li, Lipeng Zhang   +7 more
wiley   +1 more source

Bibliography and index of North American geology, paleontology, petrology, and mineralogy for the years 1901-1905, inclusive [PDF]

, 1906
Fred Boughton Weeks
openalex   +1 more source