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首页> 美国政府科技报告 >Hydrothermal-Flow Regime and Magmatic Heat Source of the Cerro Prieto Geothermal System, Baja California, Mexico
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Hydrothermal-Flow Regime and Magmatic Heat Source of the Cerro Prieto Geothermal System, Baja California, Mexico

机译：墨西哥下加利福尼亚州Cerro prieto地热系统的水热流动状态和岩浆热源

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This detailed three-dimensional model of the natural flow regime of the Cerro Prieto geothermal field, before steam production began, is based on patterns of hydrothermal mineral zones and light stable isotopic ratios observed in rock samples from more than fifty deep wells, together with temperature gradients, wireline logs and other data. At the level so far penetrated by drilling, this hydrothermal system was heated by a thermal plume of water close to boiling, inclined at 45 exp 0 , rising from the northeast and discharging to the west. To the east a zone of cold water recharge overlies the inclined thermal plume. Fission track annealing studies shows that the reservoir reached 170 exp 0 C only 10 exp 4 years ago. Oxygen isotope exchange data indicate that a 12 km exp 3 volume of rock subsequently reacted with three times its volume of water hotter than 200 exp 0 C. Averaged over the duration of the heating event this would require a flow velocity of about 6 m/year through the pores of a typical cross section of the reservoir having an average porosity of 10%. Although this is an extensional tectonic environment of leaky transform faulting in which repeated intrusions of basalt magma are likely, for simplicity of computation possible heat sources were modelled as simple two dimensional basalt intrusions of various sizes, shapes and locations. We have calculated a series of two-dimensional convective heat transfer models, with different heat sources and permeability distributions. The models which produce the best fit for the temperature distributions observed in the field today have in common a heat source which is a funnel-shaped basalt intrusion, 4 km wide at the top, emplaced at a depth of 5 km to 6 km about 40,000 to 50,000 years ago. (ERA citation 08:048921)

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