The Deep Structure Feature of the Sichuan Basin and Adjacent Orogens

Xiong, Xuejian; Gao, Rui; Guo, Lianghui; Wang, Haiyan; Zhuwei, Jiang

doi:10.1111/1755-6724.12520

Cited by 9 publications

(2 citation statements)

References 58 publications

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“…And then after reductions we obtained the fluctuating depth contours of the Moho interface and the bottom interface of sediment cover ( Fig. 4; Xiong et al 2015a). We then calculated forwardly the anomalies caused by sedimentary cover and the Moho surface and then stripped them from the Bouguer gravity anomalies, to obtain the gravity anomalies reflecting the crustal structure and tectonic features between the sedimentary cover and the Moho surface (Xiong et al 2015a, b).…”

Section: Mid-lower Crustal Gravity Anomaliesmentioning

confidence: 99%

Frozen subduction in the Yangtze block: insights from the deep seismic profiling and gravity anomaly in east Sichuan fold belt

et al. 2016

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The Sichuan basin is the main part of the middle-upper Yangtze block, which has been experienced a long-term tectonic evolution since Archean. The Yangtze block was regarded as a stable block until the collision with the Cathaysia block in late Neoproterozoic. A new deep seismic reflection profile conducted in the eastern Sichuan fold belt (ESFB) discovered a serials of south-dipping reflectors shown from lower crust to the mantle imply a frozen subduction zone within the Yangtze block. In order to prove the speculation, we also obtain the middle-lower crustal gravity anomalies by removing the gravity anomalies induced by the sedimentary rocks and the mantle beneath the Moho, which shows the mid-lower crustal structure of the Sichuan basin can be divided into eastern and western parts. Combined with the geochronology and Aeromagnetic anomalies, we speculated the Yangtze block was amalgamated by the West Sichuan and East Sichuan blocks separated by the Huayin-Chongqing line. The frozen subduction zone subsequently shifted to a shear zone accommodated the lower crustal shortening when the decollement at the base of the Nanhua system functioned in the upper plate.

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Section: Mid-lower Crustal Gravity Anomaliesmentioning

confidence: 99%

Frozen subduction in the Yangtze block: insights from the deep seismic profiling and gravity anomaly in east Sichuan fold belt

et al. 2016

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“…The Sichuan Basin is located northwest of the upper Yangtze Plate. The basin and the surrounding Longmen Shan, Micang Shan, Daba Shan, Dalou Shan, and Daliang Shan orogenic belts form an organic composite basin–mountain system, which is a Paleozoic–Mesozoic marine-continental composite oil-bearing basin development in the Tethys tectonic domain for a long time. − …”

Section: Geological Settingsmentioning

confidence: 99%

Control of Complex Structural Deformation and Fractures on Shale Gas Enrichment in Southern Sichuan Basin, China

Shi

Tang

Wu³

et al. 2022

Energy Fuels

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The research on the differential enrichment mechanism of shale gas under the complex tectonic background is a key problem to be solved currently. The southern Sichuan Basin is taken as the research object, and the geochemical experiment, overburden porosity and permeability experiments, direction test of a ground stress experiment, and seismic interpretation method are used to clarify the structural deformation characteristics and fault characteristics under different structural styles and structural parts and summarize the differences of shale gas preservation critical conditions in different structural units. The results show that (1) the fracture level controls the boundary and scale of shale gas reservoirs. The primary/secondary faults within 3 km greatly influence shale gas reservoirs, and the complex combination of fault systems will cause obvious indigenous damage to shale gas reservoirs. (2) The angle between the fault strike and the direction of the maximum principal stress determines the sealing of the fault, and the angle greater than 45° can effectively inhibit the loss of shale gas. (3) The coupling effect of burial depth and dip angle controls the migration of shale gas along the strata. The greater the burial depth and the smaller the dip angle, the better the page sealing and preservation conditions. Based on the enrichment factors of shale gas in different tectonic units, three enrichment models of syncline, anticline, and slope are established, and the enrichment favorable areas are optimized, which has important guiding significance for shale gas exploration and development in Sichuan Basin.

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Tectono-Metallogenesis in Asian Continent

Wan

2020

The Tectonics and Metallogenesis of Asia

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The Deep Structure Feature of the Sichuan Basin and Adjacent Orogens

Cited by 9 publications

References 58 publications

Frozen subduction in the Yangtze block: insights from the deep seismic profiling and gravity anomaly in east Sichuan fold belt

Frozen subduction in the Yangtze block: insights from the deep seismic profiling and gravity anomaly in east Sichuan fold belt

Control of Complex Structural Deformation and Fractures on Shale Gas Enrichment in Southern Sichuan Basin, China

Tectono-Metallogenesis in Asian Continent

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