Seismo-stratigraphic and morpho-bathymetric analysis revealing recent fluid-rising phenomena on the Adventure Plateau (northwestern Sicily Channel)

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Mariagiada Maiorana, Daniele Spatola, Simona Todaro, Francesco Caldareri, Fabrizio Parente, Alessandro Severini, Attilio Sulli
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Abstract

The northwestern region of the Sicily Channel hosts a great number of morphological highs, the widest of which is the Adventure Plateau that is part of the Sicilian Maghrebian Fold and Thrust Belt system, formed since the Neogene. The Adventure Plateau was shaped in the Early Pliocene by an extensional phase that produced high-angle normal faults mostly WNW-ESE to N-S oriented. Through these faults, magmatic fluids ascended and produced widespread volcanic manifestations often associated to fluid flow processes. The interpretation of multibeam echosounder, seismic reflection (sparker, airgun) and well-log data allow us to identify several features related to the presence of fluids in the study area. The morpho-structural analysis showed a NW–SE oriented fault system and a string of pockmarks that follow the same trend. A detailed well-log analysis confirmed the presence of oil traces, at a depth of ~ 250 m, and gas (i.e., CO2) at a depth of ~ 450 m. The seismo-stratigraphic analysis highlighted seismic signals located below the pockmarks, (e.g. seismic chimneys, bright spots) which suggest the presence of fluids that would rise to a few meters’ depth. Based on the observations, two sources and two corresponding rising mechanisms have been identified. Morphometric analysis of pockmarks has been performed to delineate their possible interaction with the bottom currents. A fluids pathway model has been reconstructed, revealing the source of fluids emissions at depth in the Adventure Plateau, and providing new insights into the identification of fluid leakage pathways.

Abstract Image

揭示冒险高原(西西里海峡西北部)近期流体上升现象的地震地层和形态-测深分析
西西里海峡西北部地区拥有大量形态高地,其中最宽的是冒险高原,它是新近纪以来形成的西西里马格里布褶皱和推力带系统的一部分。冒险高原是在早上新世的一个延伸阶段形成的,该阶段产生了高角度的正断层,主要呈西-西-北-南走向。通过这些断层,岩浆流体上升并产生了广泛的火山现象,这些现象通常与流体流动过程有关。通过对多波束回声测深仪、地震反射(火花、气枪)和井录数据的解释,我们确定了与研究区域流体存在有关的几个特征。形态结构分析显示了一个西北-东南走向的断层系统和一连串顺着同一趋势的麻点。详细的油井记录分析证实,在大约 250 米深处存在石油痕迹,在大约 450 米深处存在天然气(即二氧化碳)。地震地层分析突出显示了位于麻子下方的地震信号(如地震烟囱、亮点),这表明存在会上升到几米深处的流体。根据观测结果,确定了两个来源和两个相应的上升机制。对麻点进行了形态分析,以确定它们可能与底流的相互作用。重建了一个流体路径模型,揭示了冒险高原深处的流体排放源,并为确定流体泄漏路径提供了新的见解。
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来源期刊
Marine Geophysical Research
Marine Geophysical Research 地学-地球化学与地球物理
CiteScore
2.80
自引率
14.30%
发文量
41
审稿时长
>12 weeks
期刊介绍: Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.
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