干旱区生态环境知识资源中心(Arid): Thermal modeling of the Clear Lake magmatic system, California: Implications for conventional and hot dry rock geothermal development

Arid

DOI	10.2172/505280
报告编号	LA--12778-MS
来源ID	OSTI_ID: 505280
	Thermal modeling of the Clear Lake magmatic system, California: Implications for conventional and hot dry rock geothermal development
	Stimac, J.; Goff, F.; Wohletz, K.
英文摘要	The combination of recent volcanism, high heat flow ({ge} HFU or 167 mW/m{sup 2}), and high conductive geothermal gradient (up to 120{degree} C/km) makes the Clear Lake region of northern California one of the best prospects for hot dry rock (HDR) geothermal development in the US. The lack of permeability in exploration wells and lack of evidence for widespread geothermal reservoirs north of the Collayomi fault zone are not reassuring indications for conventional geothermal development. This report summarizes results of thermal modeling of the Clear Lake magmatic system, and discusses implications for HDR site selection in the region. The thermal models incorporate a wide range of constraints including the distribution and nature of volcanism in time and space, water and gas geochemistry, well data, and geophysical surveys. The nature of upper crustal magma bodies at Clear Lake is inferred from studying sequences of related silicic lavas, which tell a story of multistage mixing of silicic and mafic magma in clusters of small upper crustal chambers. Thermobarometry on metamorphic xenoliths yield temperature and pressure estimates of {approximately}780--900 C and 4--6 kb respectively, indicating that at least a portion of the deep magma system resided at depths from 14 to 21 km (9 to 12 mi). The results of thermal modeling support previous assessments of the high HDR potential of the area, and suggest the possibility that granitic bodies similar to The Geysers felsite may underlie much of the Clear Lake region at depths as little as 3--6 km. This is significant because future HDR reservoirs could potentially be sited in relatively shallow granitoid plutons rather than in structurally complex Franciscan basement rocks.
出版年	1997
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	15 GEOTHERMAL ENERGY ; HOT-DRY-ROCK SYSTEMS ; MAGMA SYSTEMS ; GEOLOGIC MODELS ; THERMAL ANALYSIS ; CALIFORNIA ; RESOURCE POTENTIAL ; RESERVOIR TEMPERATURE ; RESERVOIR PRESSURE Geothermal Legacy
URL	http://www.osti.gov/scitech/servlets/purl/505280
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267164
推荐引用方式 GB/T 7714	Stimac, J.,Goff, F.,Wohletz, K.. Thermal modeling of the Clear Lake magmatic system, California: Implications for conventional and hot dry rock geothermal development,1997.