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Petroleum Geology in Deepwater Settings in a Passive Continental Margin of a Marginal Sea:A Case Study from the South China Sea

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Acta Geologica Sinica(English Edition) 2021年第1期95卷 1-20页

作者： ZHANG Gongcheng FENG Congjun YAO Xingzong JI Mo YANG Haizhang QU Hongjun ZENG Qingbo ZHAO Zhao SUN Rui State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China Department of Geology Northwest UniversityXi'an 710069China CNOOC Research Institute Co. Ltd.Beijing 100028China

Deepwater oil and gas exploration has become a global hotspot in recent years and the study of the deep waters of marginal seas is an important frontier research *** South China Sea(SCS)is a typical marginal sea that includes Paleo SCS and New SCS tectonic *** latter includes continental marginal rifting,intercontinental oceanic expansion and oceanic shrinking,which controlled the evolution of basins,and the generation,migration and accumulation of hydrocarbons in the deepwater basins on the continental margin of the northern *** the Paleogene,the basins rifted along the margin of the continent and were filled mainly with sediments in marine-continental transitional *** the Neogene–Quaternary,due to thermal subsidence,neritic-abyssal facies sediments from the passive continental margin of the SCS mainly filled the *** source rocks include mainly Oligocene coal-bearing deltaic and marine mudstones,which were heated by multiple events with high geothermal temperature and terrestrial heat flow,resulting in the generation of gas and *** faults,diapirs and sandstones controlled the migration of hydrocarbons that accumulated principally in a large canyon channel,a continental deepwater fan,and a shelf-margin delta.

关键词： diapir deepwater fan gas-rich sag hydrocarbon accumulation model Wilson cycles South China Sea

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Differences of Polygonal Faults with Irregularly Polygonal Geometries: A Case Study from the Changchang Sag of Qiongdongnan Basin, Northern South China Sea

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Journal of Ocean University of China 2023年第1期22卷 119-135页

作者： LI Yufeng PU Renhai ZHANG Gongcheng FAN Xiaowei School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China Key Laboratory of Marine Mineral Resources Ministry of Natural ResourcesGuangzhou 510075China CNOOC Research Institute Beijing 100028China Research Institute of Yangchang Petroleum(Group)Co. Ltd.Xi’an 710075China

Polygonal faults(PFs)generally have a classic polygonal geometry in map ***,under the influence of tectonic faults,diapirs,channels,and slopes,the classic polygonal geometry of PFs is not preserved,demonstrating differences(different characters)in map-view 3D seismic data covering an area of 334km^(2) of the Changchang(CC)sag,are used to document the mapview and cross-sectional characteristics of *** data also help investigate the irregularly polygonal geometries of PFs due to the presence of influence factors,such as transtensional faults,submarine fans,channels,diapirs/gas chimneys,and the basal slope within the lower-middle Miocene *** show that various irregularly polygonal geometries of PFs can be classified into enechelon and arcuate PFs,channel-segmenting and-bounding PFs,radial PFs,and rectangular PFs in ***-echelon and arcuate PFs are induced by transtensional faults and exhibit a unique‘flower’structure in NE-and SE-trending cross-sections in the NW area of the study *** finding is documented for the first ***-segmenting PFs occur in the(northwest)low-amplitude muddy channel and are inhibited in the(southeast)high-amplitude sandy channel in the SW *** PFs are radially aligned around a gas chimney/diapir containing some high-amplitude anomalies(HAAs)in the middle *** presence of intrusive sandstones with HAAs along the periphery of the diapirs restricts the occurrence of *** high-amplitude submarine fans act as a mechanical barrier to the propagation of ***,the(moderate)slope in the NE area induces rectangular ***,the geneses of the PFs in the current study are comprehensively *** study adds to our understanding of the differences between PFs with irregularly polygonal geometries.

关键词： channel diapir genesis influence factors northern South China Sea polygonal fault slope transtensional faults

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Tectonic Geomorphology of Iran’s Salt Structures

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Open Journal of Geology 2015年第2期5卷 61-72页

作者： Mehran Arian Hamideh Noroozpour Department of Geology Science and Research Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Payame Noor University Tehran Iran

Iran has a various salt structures that their tectonic geomorphology is subject of this paper. Geologic situation of salt structures in Iran have determinate. According to age and geological setting of salt deposits that revealed by tectonic geomorphology methods, salt structure provinces of the Central and Southern Iran have been distinguished. Also, critical concepts of salt diapirism in the Southern Iran and Central Iran salt basins have explained. Therefore, Central Iran’s salt diapirs have triggered by tectonic forces, but salt diapirism in the Southern Iran has triggered by halokinesis, then it has effected by tectonic forces, especially in Zagros fold and thrust belt.

关键词： Tectonic Geomorphology Salt Structures diapir Iran Halokinesis

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Contrast of Seismic Reflection Characteristics of Gas Hydrate Distribution between Northeast SCS Slope and Hengchun Ridge

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Marine Science Bulletin 2008年第1期10卷 64-74页

作者：尚继宏李家彪章家保中国科学院海洋研究所浙江海洋大学浙江舟山316000

By analyzing and interpreting the newly acquired seismic profile supported by the national 973 Program and synthesizing the data with other geologic ＆ geographic information, we draw conclusions as follows, a） Two seismic reflections located at the northeast South China Sea （SCS） slope and the Hengchun ridge are the Bottom Simulated Reflections （BSRs）. Yet, the genesis and process of the gas hydrate in these two areas are different because of different regional tectonics and geological environments; b） The genesis of gas hydrate located at the northeast SCS slope area is related to the broadly existing fracture zones, slumping tectosomes, and the distinctive shielding environment of pressure masking field formed by them. But the genesis of the gas hydrate at the Hengchun ridge is associated with the thrust nappe structures and accretionary wedges formed along the Manila subduction zone and the related sub-floor fluid channel system built by them; c） Since the analogous geologic bodies are broadly distributed at slope areas around SCS and the temperature-press environment is very suitable to the formation and conservation of the gas hydrate, we suggest that much more of this resource should be stored in these areas.

关键词： BSR gas hydrate slumping block accretionary wedge thrust nappe tectosome diapir

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