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A Database for the Geysers Geothermal Field Volume II, Appendix A: Steam Flowrates and Cumulative Mass Flows

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A Database for the Geysers Geothermal Field Volume II, Appendix A: Steam Flowrates and Cumulative Mass Flows Lawrence Berkeley National Laboratory Recent Work Title A Database for the Geysers Geothermal Field Volume II, Appendix A: Steam Flowrates and Cumulative Mass Flows Permalink https://escholarship.org/uc/item/5wc330n4 Authors Bodvarsson, G.S. Cox, B.L. Fuller, P. et al. Publication Date 1989-09-01 eScholarship.org Powered by the California Digital Library University of California I· LBL-28618 V3 Lawrence Berkeley Laboratory UNIVERSITY OF CALIFORNIA EARTH SCIENCES DIVISION A Database for the Geysers Geothermal Field Volume I: Text and Main Figures G.S. Bodvarsson, B.L. Cox, P. Fuller, M. Ripperda, H. Tulinius, P.A. Witherspoon, N. Goldstein, S. Flexser, K. Pruess, and A. Truesdell September 1989 r - --I ""tin a f-l. r -(, ""I", ......I~ f) It P) c: Z I-' ~ !ll n to<i-O ro f!! 1] ;:;:;- If' -< !II r...... h Prepared for the U.S. Department of Energy under Contract Number DE-ACQ3-76SF0009S. cr n ;;0 OJ: OJ"D ;; "< !--.s. '< -..... t: fl) (f..I: DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or the Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or the Regents of the University of California. LBL-28618 1/3 ....., , A DATABASE FOR THE GEYSERS GEOTHERMAL FIELD Volume I: Text and Main Figures Gudmundur S. Bodvarsson, B. Lea Cox, Peter Fuller, Mark Ripperda, Helga Tulinius, Paul A. Witherspoon, Norman Goldstein, Steve Flexser, Karsten Pruess and Alfred Truesdell* Earth Sciences Division Lawrence Berkeley Laboratory University of California Berkeley, California 94720 *U. S. Geological Survey 345 Middlefield Road Menlo Park, California 94025 September 1989 This work was supported by the California State Lands Commission and by the U.S. Department of Energy under Contract No. DE-AC03-76SFOO098. Disclaimer .. The views and conclusions expressed in this report are those of the Lawrence Berkeley Laboratory and do not necessarily represent the policies or conclusions of the California S tate Lands Commission or any other entity. p. ~. Table of Contents List of Figures ..................................................................................................................... v List of Tables ...................................................................................................................... ix ' Acknowledgements ........................................................................................ ~ ................... .. xi '\ ""~. 1.0. INTR.ODUCI10N ...................................................................................................... 1 2.0. BACKGROUND ........................................................................................................ 3 2.1. FIELD DEVELOP~NT .......................................................................................... _ 3 2.2. GEOLOGy ....................................................................................................... 10 2.2.1. Regional Geology and Structure .......................................................... 10 2.2.2. Geology of the Geothermal System .................................................... .. 22 2.3. GEOPHYSICS .................................................................................................. 29 2.3.1. Gravity ................................................................................................ .. 30 2.3.2 Magnetics .............................................................................................. .. 33 2.3.3. Electrical Resistivity ............................................................................ .. 34 2.3.4. Temperature Gradient and Heat Aow ................................................. .. 38 2.3.5. Seismological Studies ........................................................................... 40 2.4. GEOCIiEMISTRY ........................................................................................... 48 2.4.1. Early Studies ........................................................................................ 48 ,.... ;. 2.4.2. Vapor-Dominated System Model of White and Others ....................... 50 2.4.3. Later Models of Vapor-Dominated Systems ........................................ 52 2.4.4. Geochemical Methods of Estimating Temperature and Steam Saturll-ion ................................................................................ 53 2.4.5. Petrologic Studies ................................................................................ .. 54 2.4.6. Field Wide Composition Patterns ........................................................ .. 57 2.4.7. Summai)' ............................................................................................... S8 2.5. RESERVOIR ENGINEERIN'G ........................................................................ .. S9 '. 2.5.1. Reservoir Rocks ................................................................................... S9 2.5.2. Thermodynamic State .......................................................................... .. 60 - ii - 2.5.3. Phase Composition .. '.............................................................................. 61 2.5.4. Natural Evolution ...................................................................................... .. 62 2.5.5. Well Testing .....................................................................................: .. .. 63 2.5.6. Production and Pressure I)ecline ...................................................., .. :.... 66 2.5.7. Reserves ............................................................................................... 70 ,-:' 2.5.8. Injection' .................... ~ .... ~ .......... ~ ...... : .................................. ~ ................ 71 2.5.9. Summary .............................................................................................. 72 '! ~J"" 3.0. TliE GEYSERS DATABASE .................................................................................... .. 73 3.1. GENERAL DESCRIPI10N·............................................................................. .. 73 3.2. AVAILABLE DATA ........................................................................................... 73 3.2.1.' Location Data ....................................................................................... .. '73 3.2.2. Elevation Data ...................................................................................... 75 3.2.3. Directional Surveys ..........................................................., ................... 76 3.2.4. Casing Data .......................................................................................... 76 3.2.5. Lithologic Data .................................................................................... .. 78 3.2.6. Steam Entries ....................................................................................... 78 3.2.7. Pressure Data ...................................................................................... .. 78 3.2.8. Heat Flow Data .................................................................... '................ 81 3.2.9. Geochemical Data ................................................................................ 81 3.2.10. Production/lnjection Data .................................................................. .. 82 4.0. REFERENCES ..........................................................' ................................................. 85 r' oJ List of Figures Page Figure 2-1. Steam production. water injection and electrical power produc­ 5 tion at The Geysers. 1968-1988 (modified from DOG. 1986). Figure 2-2. Locations of power plants at The Geysers. Also shown .are 6 landmarlcs. rivers. and section and county lines. Figure 2-3. Location of Clear Lake and The Geysers in the Northern Cali- 11 fomia Coast Ranges. showing generalized regional geology and . major fault zones (after McLaughlin and Pessagno. 1978). Figure 2-4. Generalized map of the Clear Lake volcanic field (shaded). 13 with major fault zones and the approximate boundaries of The Geysers steam field (after Heam et al .• 1981). Figure 2.5. Geologic map of The Geysers steam field. showing major rock 15' units. structural units. and fault zones. Structural units within the Franciscan are those of McLaughlin and Stanley (1976): Unit 1 comprises rocks of the coastal belt, Unit 2 of the coastal and central belts. and Unit 3 of the central and eastern belts. Line A-A' across the Big Sulphur Creek fault zone locates the cross-section shown in Figure 2-8 (after McLaughlin. 1977b). Figure 2.6. Schematic Cenozoic plate relationships along the western mar­ 18 gin of North American at 20. 40 and 60 m.y.b.p. Motions of the Pacific. Farallon. and Kula plates
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