scholarly journals Timing and anatomy of granitic strain gradients in the Grenville Front tectonic zone, Ontario, Canada

Geosphere ◽  
2017 ◽  
Vol 13 (6) ◽  
pp. 1949-1972
Author(s):  
Deborah Shulman ◽  
Christopher Gerbi ◽  
Jeffrey Marsh ◽  
Martin Yates ◽  
Nicholas Culshaw
Keyword(s):  
Tectonic Zone ◽  
Strain Gradients

PETROGENESIS, AGE, AND CORRELATION OF THE KAZAN DIKE SWARM, NUNAVUT, CANADA: IMPLICATIONS FOR AN ABORTED RIFT ORIGIN FOR THE SNOWBIRD TECTONIC ZONE

2016 ◽  
Author(s):  
Lisa J. Grohn ◽  
◽  
Sean P. Regan ◽  
Michael L. Williams ◽  
Larissa De Santana Do Nascimento ◽  
...  
Keyword(s):  
Tectonic Zone ◽  
Dike Swarm

scholarly journals Differential characterization of stress sensitivity and its main control mechanism in deep pore-fracture clastic reservoirs

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Denglin Han ◽  
Huachao Wang ◽  
Chenchen Wang ◽  
Wenfang Yuan ◽  
Juan Zhang ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Oil And Gas ◽  
Rapid Change ◽  
Stress Sensitivity ◽  
Irreversible Damage ◽  
Tectonic Zone ◽  
Oil And Gas Fields ◽  
Moderate Change ◽  
Sample Measurement ◽  
Gas Fields

AbstractStress sensitivity in reservoirs is critical during the exploitation of oil and gas fields. As a deep clastic reservoir under strong tectonic compression, the Ahe Formation in the northern tectonic zone of the Kuqa depression exhibited strong stress sensitivity effect. However, the conventional evaluation method by using permeability damage rate as a constraint restricts the mechanistic understanding of the strong stress sensitivity effect. In this study, morphology of stress sensitivity test curve, coupled with rate change of permeability and extent of irreversible damage in actual sample measurement through micro-CT in-situ scanning, is used to characterize differentially. The strong stress sensitivity effects of the studied intervals can be divided into three types: (1) rapid change in permeability–weak irreversible damage, (2) moderate change in permeability–strong irreversible damage and (3) moderate change in permeability–moderate irreversible damage. The strong stress sensitivity is caused by the micro-pores and micro-fractures, which are widely developed in the studied reservoir. The mechanisms caused by the two types of pore are different. The stress sensitivity effects in micro-fracture-rich reservoirs are characterized by rapid change in permeability and weak irreversible damage. Meanwhile, the stress sensitivity effects in micro-pore-rich reservoirs are manifested as moderate change in permeability and strong irreversible damage. The study shows that the differences in the content of micro-pores and micro-fractures and their reverse mechanisms of stress sensitivity co-create different types of stress sensitivity within the samples. Accordingly, the differences of the stress sensitivity type in macroscopic samples are caused by the competition between the microscopic differences of pore types.

scholarly journals Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Tomonori Tamura ◽  
Kiyokazu Oohashi ◽  
Makoto Otsubo ◽  
Ayumu Miyakawa ◽  
Masakazu Niwa
Keyword(s):  
Strain Accumulation ◽  
Tectonic Zone ◽  
Crustal Strain

Division Features of Coal-Bearing Tectonic Units in North China

2015 ◽  
Vol 737 ◽  
pp. 827-830
Author(s):  
Kang Liu ◽  
Guo Hong Qin ◽  
Zhi Kai Ma
Keyword(s):  
North China ◽  
Tectonic Structure ◽  
Tectonic Zone ◽  
Coal Resources ◽  
Tectonic Zones ◽  
Potential Evaluation ◽  
Basic Characteristics

Based on the new round of national potential evaluation on coal resources, and reference to the latest achievements about regional geological and energy basins, this article analyzed the main features of North China coalfield structure. According to the main features of North China coalfield structure and the distribution of North China coal series, the boundary of North China coal-bearing tectonic region and the division of North China coal-bearing tectonic units were identified. North China coalfield tectonic region can be divided into 5 coal-bearing tectonic sub-regions and 22 coal-bearing tectonic zones. The basic characteristics of the tectonic structure and its influence upon coal series distribution in each coal-bearing tectonic zone were systemically discussed.

scholarly journals A Tectonic Zone in the Northwestern Part of Kinki District, Southwest Japan (2)

1985 ◽  
Vol 38 (2) ◽  
pp. 243-249
Author(s):  
Susumu NISHIMURA ◽  
Tohru MOGI ◽  
Kazuo MIND ◽  
Osamu YAMADA
Keyword(s):  
Northwestern Part ◽  
Southwest Japan ◽  
Tectonic Zone

Delamerian Glenelg tectonic zone, western Victoria: Geology and metamorphism of stratiform rocks

2002 ◽  
Vol 49 (2) ◽  
pp. 187-200 ◽  
Author(s):  
C. M. Gray ◽  
A. I. S. Kemp ◽  
J. A. C. Anderson ◽  
D. J. Bushell ◽  
D. J. Ferguson ◽  
...  
Keyword(s):  
Tectonic Zone ◽  
Western Victoria

scholarly journals Conservation Integrals in Nonhomogeneous Materials with Flexoelectricity

2021 ◽  
Vol 11 (2) ◽  
pp. 681
Author(s):  
Pengfei Yu ◽  
Weifeng Leng ◽  
Yaohong Suo
Keyword(s):  
Electromechanical Coupling ◽  
Energy Momentum Tensor ◽  
Great Influence ◽  
Operator Method ◽  
Electric Polarization ◽  
Momentum Tensor ◽  
Noether Theorem ◽  
Strain Gradients ◽  
Flexoelectric Effect ◽  
Nonhomogeneous Materials

The flexoelectricity, which is a new electromechanical coupling phenomenon between strain gradients and electric polarization, has a great influence on the fracture analysis of flexoelectric solids due to the large gradients near the cracks. On the other hand, although the flexoelectricity has been extensively investigated in recent decades, the study on flexoelectricity in nonhomogeneous materials is still rare, especially the fracture problems. Therefore, in this manuscript, the conservation integrals for nonhomogeneous flexoelectric materials are obtained to solve the fracture problem. Application of operators such as grad, div, and curl to electric Gibbs free energy and internal energy, the energy-momentum tensor, angular momentum tensor, and dilatation flux can also be derived. We examine the correctness of the conservation integrals by comparing with the previous work and discuss the operator method here and Noether theorem in the previous work. Finally, considering the flexoelectric effect, a nonhomogeneous beam problem with crack is solved to show the application of the conservation integrals.

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