A New Body‐wave Amplitude Ratio‐based Method for Imaging Shallow Crustal Structure and Its Application in the Sichuan Basin, Southwestern China

2021 ◽  
Author(s):  
Xu Wang ◽  
Ling Chen ◽  
Huajian Yao
Keyword(s):  
Crustal Structure ◽  
Sichuan Basin ◽  
Wave Amplitude ◽  
Amplitude Ratio ◽  
Body Wave ◽  
Southwestern China ◽  
The Sichuan Basin

scholarly journals New freshwater plesiosaurian materials from the Middle Jurassic Xintiangou Formation of the Sichuan Basin, southwestern China

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Feng Zhang ◽  
Hai-Dong Yu ◽  
Can Xiong ◽  
Zhao-Ying Wei ◽  
Guang-Zhao Peng ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Sichuan Basin ◽  
Southwestern China ◽  
The Sichuan Basin

Pore characterization of organic-rich Late Permian Da-long Formation shale in the Sichuan Basin, southwestern China

Fuel ◽  
2018 ◽  
Vol 211 ◽  
pp. 507-516 ◽  
Author(s):  
Zhifu Wei ◽  
Yongli Wang ◽  
Gen Wang ◽  
Zepeng Sun ◽  
Liang Xu
Keyword(s):  
Sichuan Basin ◽  
Southwestern China ◽  
Late Permian ◽  
Pore Characterization ◽  
The Sichuan Basin

Maṇḍala within the Rock: The Visualization of the Mahāmāyūrī-vidyārājñī and its Altar in Southwestern China, 9th–13th Centuries

2020 ◽  
Vol 74 (4) ◽  
pp. 945-983
Author(s):  
Xiao Yang
Keyword(s):  
Sichuan Basin ◽  
Southwestern China ◽  
Spatial Structures ◽  
Text And Image ◽  
Esoteric Buddhism ◽  
The Sichuan Basin ◽  
Temporal And Spatial

Abstract This paper considers visualizations in Chinese medieval esoteric Buddhism in seven sculptural tableaux of the Mahāmāyūrī-vidyārājñī (Peacock Wisdom King 孔雀明王) from rock carving sites in the Sichuan Basin, Southwestern China. Early scholars highlighted the authority of Amoghavajra’s ritual manual for the Mahāmāyūrī images in this area, yet divergences between text and image hold them back from further interpretation. This paper reinvestigates these Mahāmāyūrī shrines “dialectically” by considering the text-image relationship. While keeping Amoghavajra’s ritual manual as a reference, it attempts to decode the meaning of the images and sites based on their own content, and to extrapolate from the text-image divergences how artistic productions and esoteric practices could lead to the presence of such divergences. This involves discussing artistic forms and decorative elements appropriated from exoteric Buddhism, as well as adjustments to the central icon and adjacent narrative scenes weaved within the temporal and spatial transitions. It also includes observations on the grouping between the Mahāmāyūrī and other deities in the larger iconographic program in their affiliated rock-cut sites, which reflects the interaction between this esoteric teaching and other popular beliefs. At least four out of seven examples share the same hierarchical iconographic programs or signature spatial structures similar to the Mahāmāyūrī altar prescribed in Amoghavajra’s ritual manual. It takes these visual or spatial similarities as concrete evidences that the construction of these shrines intended to make altars/maṇḍalas, although in two different ways to represent the esoteric altar and to create a space to conduct such a ritual.

Prediction of deep-buried gas carbonate reservoir by combining prestack seismic-driven elastic properties with rock physics in Sichuan Basin, southwestern China

2014 ◽  
Vol 2 (4) ◽  
pp. T193-T204
Author(s):  
Jiqiang Ma ◽  
Jianhua Geng ◽  
Tonglou Guo
Keyword(s):  
Elastic Properties ◽  
Seismic Data ◽  
Sichuan Basin ◽  
Incident Angle ◽  
Rock Physics ◽  
Carbonate Reservoir ◽  
Southwestern China ◽  
Marine Carbonate ◽  
The Sichuan Basin ◽  
Elastic Impedance

The prediction of seismic reservoirs in marine carbonate areas in the Sichuan Basin, southwestern China, is very challenging because the target zone is deeply buried (more than 6 km), with multiphase tectonic movements, complex diagenesis, and low porosity, and the incident angle of the seismic data is finite. We developed reliable hydrocarbon indicators of a marine carbonate deposit based on prestack elastic impedance (EI) and well observations. Although the hydrocarbon indicators can be calculated from elastic parameters, the inversion for EI-driven elastic attributes is usually unstable. To constrain the inversion process, we discovered a new strategy to recover the elastic properties from EIs within a Bayesian framework (called Bayesian elastic parameter inversion from elastic impedance). We applied the strategy to a carbonate reef identified at the center of a study line based on the geologic context and the seismic reflection patterns. We then used rock-physics analyses to classify the lithologies and the reservoir at a well location. Rock-physics modeling quantified the hydrocarbon sensitivity of the elastic attributes. Fluid substitution was used to investigate the effects of pore fluids on the elastic properties. A comparison of two synthetic amplitude-versus-angle responses (for gas and brine saturation) with real seismic data showed that the reservoir was gas charged. Using well-based crossplot analyses, reliable direct hydrocarbon indicators can be constructed for a deeply buried gas reservoir and were effective for interpretation in an area of marine carbonates in the Sichuan Basin.

The Deformation Features of Crustal Structure Beneath the East Tibetan Margin and Neighboring Areas

2014 ◽  
Vol 501-504 ◽  
pp. 1520-1523
Author(s):  
Chang Qing Sun
Keyword(s):  
Crustal Structure ◽  
Sichuan Basin ◽  
Amplitude Ratio ◽  
Broad Band ◽  
Time Difference ◽  
Maximal Energy ◽  
Wave Splitting ◽  
Deformation Features ◽  
Longmenshan Fault ◽  
Fault Belt

Shear wave splitting analysis is one of the most commonly used techniques in structural seismology. In this study, the splitting parameters of Moho converted P-to-S phase (Pms), the time difference between maximal energy of qS1 and qS2 and their amplitude ratio were obtained. The data were from 29 broad-band stations across the Longmenshan fault belt. Subsequently, the deformation features of the crustal structure beneath the east Tibetan margin and Sichuan basin were analyzed. Our results show that the time delay and the time difference between maximal energy of qS1 and qS2 in east Tibetan margin is obviously larger than Sichuan basin. However, the amplitude ratio between qS1 and qS2 beneath Longmenshan fault is much smaller than other tectonic sub-regions. These results may suggest the existence of fluid beneath the Longmenshan fault.

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