Fluid flow in the Keathley Canyon 151 Mini-Basin, northern Gulf of Mexico

被引:19
作者
Dugan, Brandon [1 ]
机构
[1] Rice Univ, Dept Earth Sci, Houston, TX 77005 USA
关键词
Permeability; Fluid Flow; Overpressure; Gulf of Mexico; Keathley Canyon; Ocean drilling;
D O I
10.1016/j.marpetgeo.2007.12.005
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Laboratory experiments and drilling observations are used to estimate vertically upward fluid flow rates of approximately 4 mm/yr in Keathley Canyon, northern Gulf of Mexico. Based on uncertainty in pressure and permeability models, flow rates exceed 1.3 mm/yr but are less than 28 mm/yr. Consolidation experiments document that permeability decreases from 10(-15) m(2) at the seafloor to 10(-18) m(2) at 300 m below seafloor. I use these experimental data with logging-while-drilling data to constrain a permeability function for the basin. Sediment discharge from an open borehole filled with weighted mud is used to estimate a minimum overpressure gradient of 4.3 kPa m(-1) in the Keathley Canyon mini-basin. The overpressure gradient and permeability model are input into Darcy's law to estimate an average flow rate for the basin. These flow rates are consistent with estimates of compaction-driven flow from existing regional-scale models of flow in the northern Gulf of Mexico. Hydrate stability calculations for the basin predict a 25 m deepening of the base of hydrate stability due to overpressure. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:919 / 923
页数:5
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