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Surface and Deep Structure of the Hanshan-Wuwei Basins in the Lower Yangtze Region:Implications for Mesozoic Tectonic Evolution of the South China Block

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1154-1170页

作者： KAN Tianxiang LI Longming ZHENG Hongjun LI Jiahao ZHAO Xilin CHEN Mo School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Anhui Institute of Geo-Environment Monitoring Hefei 230001China Nanjing Center China Geological SurveyNanjing 210016China

Indicating the tectonic features of the Hanshan-Wuwei basin can reconstruct the framework of the basins formed in Mesozoic and further understand the Mesozoic tectonic evolution of the South China *** on surface structure,regional stress field and deep geophysical characteristics of the Mesozoic Hanshan-Wuwei basin in Lower Yangtze region were carried ***-NNE trending folds and faults developed in the northern margin of the *** reconstruction of tectonic stress fields indicates four stress stages dominating the basins'evolution including NW-SE compression,N-S compression,NW-SE extension and NWW-SEE compression.2D seismic profiles reveal coexistence of thrust,strike-slip and normal faults in the *** with regional geological studies,the geodynamic processes for the formation of the Hanshan-Wuwei basin can be divided into five stages:1)During the Late Triassic,EW trending foreland basin was formed by N-S compression;2)From Mid-Jurassic to Late Jurassic,continuous compression strengthened the foreland deformation and formed thrust *** this stage,the integrated foreland basin was compartmentalized or fragmented,and transferred to the broken foreland basin;3)NE-trending sinistral strike-slip movement at the beginning of the Early Cretaceous;4)Regional extension resulted in normal faults and rift basins developing in the Late Cretaceous;5)The NWW-SEE compression at the end of the Late Cretaceous caused NW sinistral strike-slip faults to form,which partly transformed the rift basin.

关键词： structure seismic profile Mesozoic Hanshan-Wuwei basins Lower Yangtze region

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Kinematic evolution of fold-and-thrust belts in the Yubei-Tangbei area: Implications for tectonic events in the southern Tarim Basin

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Geoscience Frontiers 2021年第6期12卷 46-65页

作者： Yiqiong Zhang Dengfa He Bin Wu Huahua Gao Friedrich-Schiller-Universität Jena Burgweg 11Jena 07749Germany China University of Geosciences(Beijing) Beijing 100083China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China CNOOC Research Institute Ltd. Beijing 100028China China National Oil and Gas Exploration and Development Corporation Beijing 100034China

The Yubei-Tangbei area in the southern Tarim Basin is one of the best-preserved Early Paleozoic northeast-southwest trending fold-and-thrust belts within this *** area is crucial for the exploration of primary hydrocarbon reservoirs in northwestern *** this study,we constructed the structural geometric morphology of the Yubei-Tangbei area using geophysical logs,drilling,and recent two-and three-dimensional(2-D and 3-D)seismic *** Early Paleozoic fault-propagation folds,the Tangnan triangle zone,fault-detachment folds,and trishear fault-propagation folds developed with the detachment of the Middle Cambrian gypsum–salt *** to a detailed chronostratigraphic framework,the growth strata in the Upper Ordovician–Lower Silurian layer formed by onlapping the back limb of the asymmetric fault-propagation folds,which therefore defines the timing of *** changes in kink band hinges and amplitudes in the Permian–Carboniferous and Cenozoic folding strata suggest that the evolution of the fold-and-thrust belts followed a sequential evolution process rather than a simultaneous *** the pre-existing Precambrian basement structure,the Yubei-Tangbei fold-and-thrust belts can be divided into four tectonic evolution stages:Late Cambrian,Late Ordovician to Early Carboniferous,Carboniferous to Permian,and *** northwestern-verging Cherchen Fault is part of the piedmont fold-and-thrust system of the southern Tarim foreland *** interpreted its strata as a breakthrough trishear fault-propagation fold that developed in three phases:Mid–Late Ordovician,Silurian to Middle Devonian,and Triassic to *** tectonic events are responses of the Altyn-Tagh and Kunlun collisional orogenic belts and the Indian-Eurasian *** inherited deformation and structural modification in the southern Tarim Basin may be an indicator of the growth and evolution of peripheral orogens.

关键词： Southern Tarim Basin seismic profile Growth strata Kunlun orogeny Altyn-Tagh orogeny Cherchen Fault

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Improving signal to noise ratio of seismic profiles using an image processing technique

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Applied Geophysics 2006年第2期3卷 92-97页

作者： Zhang Wenpo Guo Ping Yang Zaichao Hu Tianyue School of Earth and Space Sciences Peking University Beijing 100871 China Exploration and Development Research Institute Liaohe Oilfield Petrochina Liaoning 124010 China APEX Company （Beijing） Beijing 100025 China

This paper introduces an image processing technique into seismic data processing as a noise attenuation technology. The image separation of the seismic profile is obtained by using grating operators based on different time dips and a set of relative single dip profiles is obtained. A high signal to noise ratio profile can be obtained during reconstruction by statistical weighting. With further processing analysis and geological study, a high signal to noise profile that can meet geological requirements can be produced. The real data examples show that the signal to noise ratio of the profile is greatly improved, the resolution of the profile is maintained, and the fault terminations are much clearer after using the image processing method.

关键词： seismic profile digital image and vector decomposition

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Ray equation migration of wide-angle reflections in Dabie orogenic zone

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Acta Seismologica Sinica(English Edition) 1998年第2期11卷 63-72页

作者：郑需要王椿镛赖晓玲张先康 1. Research Center of Exploration Geophysics State Seismological Bureau 450003 Zhengzhou China 2. Institute of Geophysics State Seismological Bureau 100081 Beijing China

ay equation migration of wide-angle reflections in 2-D medium is one kind of Kirchhoff prestack depth migration method. Based on ray theory, this method can be used extensively in 2-D inhomogeneous medium, and shows its advantage in wide-angle reflection study. After calculating ray fields, we can get the wave fields of sources and receivers by interpolation, and the intensity (or amplitude) AP corresponding to the depth point P at travel-time tP=tSP+tPR can be found in seismograms. Ray equation migration is completed by transforming AP according to the specific relation, migrating it to the depth point, then calculating the ray fields of lots of sources and receivers in the same way and finally stacking the outcomes. Numerical calculation has yielded satisfactory results. Data processing of the Zhuangmu-Yuexi-Huangmei-Zhanggongdu profile passing through the Dabie orogenic zone provides a structural form of M-discontinuity along the profile. The result shows that the high pressure metamorphic rock zone of South Dabie rock mass is related to the uplifting of M-discontinuity here. 'Mountain root' exists under North Dabie rock mass, which conforms with gravity isostasy theory. The Xiaotian-Mozitan fault is a suture zone as a result of the collision of North China plate with Yangtze plate, and extends through M-discontinuity. The abyssal fault near Liu'an is the extended eastern section of the Luonan-Minggang fault, which is also confirmed here. 

关键词： ray equation migration seismic profile M-discontinuity abyssal fault Dabie orogenic zone

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Meso-Cenozoic extensional structures in the Northern Tarim Basin,NW China

Meso-Cenozoic extensional structures in the Northern Tarim B...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Yue-Jun Li Yan Zhao Long-De Sun Wen-Jie Song Duo-Ming Zheng Ya-Lei Liu Dao-Xuan Wang Jian-Feng Hu Qi-Rui Zhang Institute of Geology and Geophysics Chinese Academy of Sciences PetroChina Company Limited Tarim Oil-field Company PetroChina Hefei University of Technology

Meso-Cenozoic extensional structures are important for understanding the tectonics of the Chinese Central *** paper presents a systematic investigation on the Meso-Cenozoic extensional structures in the Northern Tarim *** interpretations of seismic data reveal that the Meso-Cenozoic extensional structures were widely developed in the Northern Tarim *** extensional structures are regionally composed of many small normal faults,which usually group into left-or right-step en echelon and form several transtensional fault *** of normal faults in profile become small graben-horst or staircase-like *** on the areal distribution, structural style,combination relationship,formation and evolution time,and formation mechanism of the extensional structures,we found that the Meso-Cenozoic extensional structures in Northern Tarim Basin can be classified into two conjugate normal fault systems,which were formed separately in Jurassic-Early Cretaceous and Late Cretaceous-Neogene. The former is likely associated with the stress relaxation after a collisional orogeny accompanied with a certain degree of anticlockwise rotation of the Tarim block relative to the South Tianshan;the latter is possibly induced by the east by south tectonic escape of the Tarim block with a certain degree of clockwise rotation relative to the South Tianshan triggered by the far-field effect of the Himalayan orogeny.

关键词： Northern Tarim Basin seismic profile Meso-Cenozoic extensional structure Transtensional fault zone Post-orogenic stress relaxation Tectonic escape

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