Study on the effect of fluid migration system on natural gas hydrate accumulation in typical areas along active continental margin
The natural gas hydrates widely distribute along the active continental margin.The formation and distribution of gas hydrates are intimately connected to fluid migration systems,holding significant implications for deepwater oil and gas exploration,researches on submarine disasters,and global climate change.This study focuses on selected active continental margin regions,namely the Makran accretion wedge,Ulleung Basin,and Cascadia accretion wedge,to provide a systematic summary of the distinct characteristics exhibited by fluid migration systems on wedge,Ulleung Basin,and Cascadia accretion wedge,to provide a systematic summary of the distinct characteristics exhibited by fluid migration systems in each region,aiming to investigate the influence of fluid migration systems on gas hydrate accumulation.Findings reveal that variations in local tectonic environments and sedimentary conditions give rise to diverse development models for fluid migration systems and hydrate accumulation types across different regions.The fluid migration system within the Makran accretion wedge is predominantly governed by mud diapirs and faults,resulting in the formation of"mud diapir"and"multi-stepped accretionary wedge"type hydrate reservoir.In the Ulleung Basin,the fluid migration system is dominated by gas chimneys,leading to the formation of a diffused hydrate reservoir.In the Cascadia accretion wedge,the fluid migration system is characterized by a combination of mud diapirs,gas chimneys,and fractures,giving rise to a leaky hydrate reservoir.While extensive geophysical surveys have been conducted on gas hydrates in typical sea areas of active continental margins,and various hydrate accumulation types have been identified,there remains a dearth of quantitative studies on fluid flux under different migration systems and analyses of spatio-temporal evolution processes associated with different migration systems.Therefore,it is recommended to integrate research methodologies and techniques from disciplines such as geophysics,geology,and geochemistry to undertake a comprehensive,multi-scale,and multi-parameter study.
Active continental marginsFluid migration systemsNatural gas hydrate
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