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Implications of Salt Tectonics on Hydrocarbon Ascent in the Eastern Persian Gulf:Insights into the Formation Mechanism of Salt Diapirs,Gas Chimneys,and Their Sedimentary Interactions

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Journal of Ocean University of china 2024年第6期23卷 1515-1533页

作者： XUE Yang LUAN Xiwu RAVEENDRASINGHE Thanuja D WEI Xinyuan JIN Long YIN Jian QIAO Jianghao College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Physical Sciences Faculty of Applied SciencesSouth Eastern University of Sri LankaSammanthurei 32200Sri Lanka College of Marine Geosciences Ocean University of ChinaQingdao 266100China

Gas chimneys,salt domes,and faults are vital to the movement of hydrocarbons within geological *** identification of these geological features is crucial to modeling hydrocarbon *** study explores the processes that have shaped the eastern Persian Gulf,focusing on salt diapir characteristics,origin,and fluid *** collisions between the Indian,Eurasian,and Arabian Plates have considerably impacted salt tectonics,developing key features such as the Hormuz salt,Qatar-South Fars Arch,and Zagros and Oman orogenic ***-related features were discerned through two-dimensional seismic data and drilling records,salt movement sequences were reconstructed,and fluid expulsion patterns were delineated using attribute *** results of this study revealed that fractured substrates influenced by regional tectonic forces contribute to the creation of salt diapirs,which serve as conduits for guided fluid ***,these results showed that gravity-driven downbuilding mainly controls salt flow,while the circular arrangement of salt structures results from regional stress and interactions between different salt *** stress-induced basement incisions compounded by the hindrance of initial salt movement by the Qatar Arch further contribute to the complex salt structure ***,the uplift of the Qatar Arch and stresses from the Oman and Zagros orogenies profoundly affect the salt structure geometry and depositional patterns across diverse regions,resulting in circular salt structures and gas *** study offers valuable perspectives for oil and gas exploration and provides a comprehensive understanding of the regional dynamics governing salt tectonics and hydrocarbon ascent in the eastern Persian Gulf.

关键词： Persian Gulf salt tectonics salt diapirs gas chimneys salt-sediment interaction fluid ascent

Nile tilapia(Oreochromis niloticus)invasion impacts trophic position and resource use of commercially harvested piscivorous fishes in a large subtropical river

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Ecological Processes 2023年第1期12卷 313-329页

作者： Fangmin Shuai Jie Li Sovan Lek Pearl River Fisheries Research Institute CAFSGuangzhou 510380China Universitéde Toulouse-PaulSabatier 118 Route de Narbonne31062 Toulouse CedexFrance

Background Although freshwater ecosystems cover less than 1%of the earth’s surface,they support extremely high levels of biodiversity and provide vital ecosystem ***,due to the introduction of non-native fishes,aquatic ecosystem functioning has been altered,and in some cases,declined *** the impacts of invasive species has proven *** this study,we examined the relative trophic position of native piscivorous fishes to estimate the effects of invasive Nile tilapia on food webs in the downstream sections of an invaded large subtropical river,the Pearl River,***,we quantified how native piscivorous fish diets changed as the Nile tilapia invasion *** The trophic position of the widely distributed and locally important economically harvested piscivorous culter fish(Culter recurviceps),mandarinfish(Siniperca kneri),and catfish(Pelteobagrus fulvidraco)lowered significantly in the invaded Dongjiang River compared to an uninvaded reference Beijiang *** lower trophic position of these piscivorous fishes was reflected by a major reduction in the proportion of prey fish biomass in their diets following the Nile tilapia *** fishes in the diet of culter fish from the reference river(33%small fishes,17%zooplankton)shifted to lower trophic level zooplankton prey in the invaded river(36%zooplankton,25%small fish),possibly due to the presence of Nile ***,small fishes in the diet of mandarinfish in the reference river(46%small fishes,11%aquatic insects)declined in the invaded river(20%aquatic insects,30%small fishes).Similarly,the diet of catfish from the reference river shifted from fish eggs(25%fish eggs,25%aquatic insects)to aquatic insects in the invaded river(44%aquatic insects,5%fish eggs).Conclusions The results of this study contributed to a growing body of evidence,suggesting that Nile tilapia can modify trophic interactions in invaded *** is crucial to understand t

关键词： Nile tilapia Invasion Stable isotope ratio Trophic position Stable isotope mixing model

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Diagenetic mineralogy and its effect on the reservoir properties of the sandstones of the Permian of S120 block(Sulige gas field),Ordos Basin,NW china

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Journal of Palaeogeography 2022年第3期11卷 360-386页

作者： Qi Wan Ai-Ping Fan Ren-Chao Yang Nils Lenhardt Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China Department of Geology University of PretoriaPrivate Bag X200028PretoriaSouth Africa

The characteristics of diagenetic minerals and their effects on reservoir quality of the tight sandstones of the Permian in Sulige gas field of the Ordos Basin were studied through observations on thin sections,scanning electron microscopy,energy dispersive spectroscopy analysis and electron microprobe *** minerals in the Permian sandstones consist of illite,kaolinite,chlorite,siliceous and calcite *** amounts of intercrystalline pores between kaolinite and illite provide channels for acidic fluids flow and thereby were conducive to the formation of clastic solution pores,intergranular solution pores and composite *** chlorite occurs in the form of three morphotypes as grain-coating,pore-lining and ***-coating and pore-lining chlorite with different crystal shapes occur as coatings on the framework ***-filling chlorite precipitated as discrete flaky plates in pore *** microcrystals developed but quartz overgrowth did not develop because of the occurrence of porelining ***,in turn,led to the preservation of primary pores by occupying potential nucleation sites for quartz overgrowth and thereby preventing quartz microcrystals from merging into quartz *** process is regarded as the most important for influencing the quality of the lithophysical *** cement was mainly precipitated during a late diagenetic stage and has a negative effect on the reservoir *** study provides important insights into analyzing the relationship between diagenetic minerals and reservoir quality and the results are directly applicable to the exploration and development of tight sandstone reservoirs all over the world.

关键词： Ordos basin Sulige gas field Permian Diagenetic processes Siliceous cement Chlorite

Sediment Characteristics, Sources, and Transport Patterns in Kompong Som Bay, Cambodia: Indications from Grain Size and Heavy Minerals

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Journal of Ocean University of china 2021年第2期20卷 329-339页

作者： LIU Jinqing CHEN Xiaoying YIN Ping CAO Ke GAO Fei MENG Yuanku QIU Jiandong LI Meina College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Key Laboratory of Marine Environmental Geology Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China

In this paper, we analyzed the grain size and heavy mineral compositions of 52 surface sediment samples collected from the Kompong Som Bay of Cambodia and the adjacent rivers to depict the marine sedimentary environments and transport processes. Heavy minerals in sediments are dominated by authigenic pyrite, siderite, and tourmaline, with average percentages of 36.52%, 29.02%, and 10.94%, respectively. Two provinces can be divided according to the spatial similarity of minerals. The sediments from Province I, covered by silt grains in the northern bay, are characterized by autogenic pyrite, indicating a weakly reducing environment;whereas in Province II, covered by sand grains in the southern bay, the siderite-tourmaline-authigenic pyrite-zircon-hornblende assemblage occurs, indicating a mild reducing environment and locally oxidizing environment. Most of the sediments in the Kompong Som Bay are introduced from the Preak Piphot River and Srae Ambel River, except that some of them in the south areas come from coastal erosion. Generally, the sediments are difficult to be transported because of the low sediment loads entering the sea and weak hydrodynamic conditions. However, they are transported from the north to the south during the tide ebbing when the hydrodynamic force is much stronger. The sediment distribution and transport patterns are controlled by many factors, including submarine topography, hydrodynamic conditions, the southwest monsoon, land contours, and sediment supply.

关键词： heavy mineral provenance sedimentary environment sediment transport Kompong Som Bay Cambodia

The control of Pleistocene palaeogeography on the distribution of sandy patches in a silty Holocene lagoon(central Netherlands)

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Journal of Palaeogeography 2022年第4期11卷 565-583页

作者： Ai-Ping Fan A.J.(Tom)van Loon Ren-Chao Yang College of Earth Science and Engineering Shandong University of Science and TechnologyQingdaoChina Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

The brackish lagoon in the central part of The Netherlands was closed by a dike in 1932 and gradually changed into a *** of this lake were reclaimed and the surficial sediments of one of the polders(Noordoostpolder),reclaimed in 1942,has been investigated in detail by mapping of the walls of some1500 km of drainage ditches approx.1.4 m *** appeared that the sediments consist of an uncommonly large amount of silt,to different degrees mixed with reworked peat that had developed during the Holocene *** sandy deposits occur locally,at places that are at first sight distributed in a haphazard *** various sandy patches have different characteristics(grain-size distribution,rounding of the grains,mineral composition).These sands cannot have been introduced from the sea,nor can they have been supplied by the rivers that discharged into the lagoon,so they must have a local *** is found that several types of Pleistocene sandy or diamictic deposits below the Holocene peat and lagoonal sediments had an irregular topography and became eroded during the Holocene by wave *** resulted in sandy deposits around these Pleistocene highs,which consisted of glacial tills(boulder clays),river dunes(formed by aeolian activity along rivers under dry permafrost conditions)and coversand ridges,formed by aeolian activity in a belt between the ice margin and the more distal loess *** finding implies that palaegeographical interpretations of local grain-size anomalies in a specific deposit should not only consider facies changes due to changes in the sediment supply,but should also consider local erosion leading to the exposure of previously deposited material with a divergent composition.

关键词： Lagoonal palaeogeography Netherlands Noordoostpolder Wave erosion Abrasion Holocene

Identification and Characterization of a Novel Alkali-and High Temperature-Tolerant Lipase(Lip4346)from a Macroalgae-Associated Bacterial Strain

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Journal of Ocean University of china 2021年第1期20卷 181-188页

作者： GU Xiaoqian GUI Yuanyuan LI Jiang ZHANG Xuelei ZILDA Dewi Seswita MNR Key Laboratory for Science&Technology of Marine Ecosystems First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Environmental Engineering Qingdao UniversityQingdao 266061China Research Center for Marine and Fisheries Product Processing and Biotechnology Agency for Marine and Fisheries Research and DevelopmentMinistry of Marine and Fisheries AffairsJakarta 40115Indonesia

A novel lipase gene(lip4346)encoding a primary translation product with 176 amino acids was screened from the genome fine mapping of the macroalgae-associated bacterial strain Microbulbifer *** were collected from the coast of the Halmahera Island of *** lip4346 gene was cloned and heterologously expressed in Escherichia *** purified recombinant Lip4346 protein had a molecular mass of 19 k Da,a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE),and a maximum enzyme activity of 31.2 U m *** optimal temperature and pH for the lipase activity of Lip4346 were 70℃and 10.0,***4346 was tolerant with a number of organic solvents and detergents,and was active toward triacylglycerols and p-nitrophenyl esters with short-and medium-chain *** unique characteristics of Lip4346 indicate that it is a promising nonaqueous biocatalyst for industrial applications.

关键词： Microbulbifer lipase alkali-tolerant high temperature-tolerant

Preservation of Lipid Molecular Fossils in the Sediments from an Oil-Gas Releasing Zone in the South china Sea

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Journal of Ocean University of china 2018年第6期17卷 1336-1342页

作者： QIU Hong ZOU Li ZHANG Minsheng ZHU Chaoqi JIA Yonggang College of Environmental Science and Engineering Ocean University of China Education Key Laboratory for Marine Environment and Ecology Ocean University of China

In order to explore the standing stock and preservation of organic carbon, different forms of compound specific lipids were analyzed, based on a 1.8 m sediment core collected in the northern continental shelf of South china Sea in May, 2016. In the core sediments, 21 species of fatty acids, 6 species of alcohols, 8 species of sterols and phytol were detected. Fatty acids were dominated components with the percent of 67%–91% in the total lipids, in which saturated fatty acid C16:0 accounted for about 50%. The contents of lipid species generally decreased from the sediments at surface to those deep, except alcohols waving in a certain range at the same time. Fatty acids primarily existed in free form, followed by base hydrolytic form, and then acid hydrolytic form. Free alcohols were obviously dominated, while base and acid hydrolytic forms contributed small comparably. Phytol gave a significant priority to base hydrolytic form, while acid hydrolytic form could be neglected. Similar to phytol, sterols mostly presented in base hydrolytic form, and then in free form. The compositions of lipids and their forms suggested that organic carbon basically originated from primary production in upper waters in studying area, and were well preserved in the sediments.

关键词： lipids sediments preservation South china Sea

An ocean acidification-simulated system and its application in coral physiological studies

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Acta Oceanologica Sinica 2018年第12期37卷 55-62页

作者： ZHENG Xinqing WANG Chenying HADI Tri Aryono YE Youyin PAN Ke Third Institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences Institute for Advanced Study Shenzhen University

Due to the elevated atmospheric carbon dioxide, ocean acidification(OA) has recently emerged as a research theme in marine biology due to an expected deleterious effect of altered seawater chemistry on calcification. A system simulating future OA scenario is crucial for OA-related studies. Here, we designed an OA-simulated system(OASys) with three solenoid-controlled CO_2 gas channels. The OASys can adjust the pH of the seawater by bubbling CO_2 gas into seawaters via feedback systems. The OASys is very simple in structure with an integrated design and is new-user friendly with the instruction. Moreover, the OASys can monitor and record real-time pH values and can maintain pH levels within 0.02 pH unit. In a 15-d experiment, the OASys was applied to simulate OA in which the expected target pH values were 8.00, 7.80 and 7.60 to study the calcifying response of Galaxea fascicularis. The results showed daily mean seawater pH values held at pH 8.00±0.01, 7.80±0.01 and 7.61±0.01 over15 d. Correspondingly, the coral calcification of G. fascicularis gradually decreased with reduced pH.

关键词： ocean acidification OASys coral Galaxea fascicularis

Migrated hybrid turbidite-contourite channel-lobe complex of the late Eocene Rovuma Basin, East Africa

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Acta Oceanologica Sinica 2021年第2期40卷 81-94页

作者： Yintao Lu Xiwu Luan Boqing Shi Weimin Ran Fuliang Lü Xiujuan Wang Quanbin Cao Xiaoyong Xu Hui Sun Genshun Yao Petrochina Hangzhou Research Institute of Geology Hangzhou 310023China Qingdao Institute of Marine Geology China Geological SurveyQingdao 266071China Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China china National Oil and Gas Exploration and Development Corporation Beijing 100034China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

Analysis of 3 D seismic data and well log data from the Rovuma Basin in East Africa reveals the presence of a late Eocene channel-lobe complex on its *** first two channels,denoted as channel-1 and channel-2,are initiated within a topographic low on the slope but come to a premature end when they are blocked by a topographic high in the northwest region of the *** channels migrate southeastward from channel-1 to channel-6 due to the region’s sufficient sediment supply and stripping caused by bottom *** primary factors controlling the development of the channel complex include its initial paleo-topographic of seafloor,the property of gravity flows,the direction of the bottom current,and the stacking and expansion of its *** transition zone from channel to lobe can also be clearly identified from seismic sections by its pond-shaped *** a certain point,thest systems record a transiton from erosive features to sedimentary features,and record a transition from a confined environment to an open *** and lobes can be differentiated by their morphologies:thick slump-debris flows are partly developed under channel sand sheets,whereas these slump-debris flows are not very well developed in *** log responses also record different characteristics between channels and *** interpreted shale volume throughout the main channel records a box-shaped curve,thereby implying that confined channel complexes record high energy currents and abundant sand supply,whereas the interpreted shale volume throughout the lobe records an upward-fining shape curve,thereby indicating the presence of a reduced-energy current in a relatively open *** the Rovuma Basin of East Africa,the average width of the Rovuma shelf is less than 10 km,the width of the slope is only approximately 40 km,and the slope gradient is 2°–4°.Due to this steep slope gradient,the sand-rich top sheet within the channel also likely contributes to the

关键词： East Africa Rovuma Basin deep-water sediment channel-lobe complex