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首页> 外文期刊>Geophysical Research Letters >Near-seafloor overpressure in the deepwater Mississippi Canyon, northern gulf of Mexico
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Near-seafloor overpressure in the deepwater Mississippi Canyon, northern gulf of Mexico

机译：墨西哥北部海湾深水密西西比峡谷的近海超压

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Laboratory experiments constrain overpressure (25-50% of hydrostatic effective stress) above 30 mbsf at two sites in the Mississippi Canyon region, northern Gulf of Mexico. Overpressure at site 2562 is less than that at site 2567; however site 2562 has accumulated faster. One-dimensional sedimentation-consolidation models cannot recreate the overpressure without external fluid sources. A fluid source (specific discharge, q = 2-7 mm/yr) is required for site 2567, whereas a fluid sink (q = 10-12 mm/yr) is required for site 2562 to simulate the constrained overpressure. Although basal conditions differ, specific discharge of 2.1-4.2 mm/yr occurs at the sea floor. Shallow upward flow at each site, deep upward flow at site 2567 and deep downward flow at site 2562 is consistent with a two-dimensional flow field where sites 2562 and 2567 are hydrologically connected at depth by a regional aquifer.
机译：实验室实验在墨西哥湾北部密西西比峡谷地区的两个地点将过压（静水有效应力的25-50％）限制在30 mbsf以上。站点2562的超压小于站点2567的超压。但是，站点2562的累积速度更快。一维沉降固结模型无法在没有外部流体源的情况下重建超压。站点2567需要流体源（比流量，q = 2-7 mm / yr），而站点2562需要流体沉（q = 10-12 mm / yr），以模拟约束超压。尽管基础条件有所不同，但海底会发生2.1-4.2 mm / yr的比排放。在每个站点处浅的向上流动，在站点2567处的深向上流动和在站点2562处的深向下流动与二维流场一致，在该二维流场中，区域2562和2567通过区域含水层在水文上深度相连。

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