Assessment of Geothermal Resources of the United States-1975
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C.726 Assessment of Geothermal Resources of the United States-1975 GEOLOGICAL SURVEY CIRCULAR 726 Prepared in cooperation with the Energy Research and Development Administration Assessment of Geothermal Resources of the United States-1975 D. E. White and D. l. Williams, Editors G E 0 L 0 G I C A L S U R V E Y C I R C U L A R 726 Prepared in cooperation with the Energy Research and Development Administration 1975 United States Department of the Interior CECIL D. ANDRUS, Secretary Geological Survey H. William Menard, Director Library of Congress catalog-card No. 75-600076 First printing 1975 Second printing 1975 Third printing 1976 Fourth printing 1979 Free on application to Branch of Distribution, U.S. Geological Survey 1200 South Eads Street, Arlington, Va. 22202 CONTENTS Page Introduction, by D. E. White and D. L. Williams ------------------------------- 1 Hydrothermal convection systems, by J. L. Renner, D. E. White, and D. L. Williams 5 Igneous-related geothermal systems, by R. L. Smith and H. R. Shaw ------------ 58 Temperatures 'and heat contents based on conductive transport of heat, by W. H. Diment, T. C. Urban, J. H. Sass, B. V. Marshall, R. J. Munroe, and A. H. Lachenbruch -------------------------------------------------------------- 84 Geothermal resources in hydrothermal convection systems and conduction-domi- nated areas, by Manuel Nathenson and L. J. P. Muffler --------------------- 104 Recoverability of geothermal energy directly from molten igneous systems, by D. L. Peck ---------------------------------------------------------------- 122 Assessment of onshore geopressured-geothermal resources in the northern Gulf of Mexico basin, by S. S. Papadopulos, R. H. Wallace, -Jr., .J. B. Wesselman, and R. E. Taylor --------------------------------------------------------- 125 Appendix, discussion of data used -------------------------------------- 141 Summary and conclusions, by D. E. White and D. L. Williams ------------------- 147 ILLUSTRATIONS Page FIGURE 1. Map showing 1ocation of hydrothermal convection systems in the conterminous United SU3 tes ~ith indicated subsurface telllpe~tures above 150°0 -------------------------------------- 22 2. Map showing location of hydrothermal conve~tion systems in Alaska and Hawaii· with indicated subsurface temperatures above 150°0 and between 90° and 150°0 ------------------------- 23 3. Map shoping location of hydrothermal conve~tion systems in the conterminous United Stztes ·with indicated subsurface temperatures between 90°0 and 150°0 --------------------------- 50 4. Graph of theoretical cooling time versus volume for magma bodies -------------------------- 74 5. Map showing identified volcanic systems in the conterminous United States ------------------- 77 6. Map showing identified volcanic systems and basaltic lava fields known to be less than 10,000 years old in Alaska and Hawaii ----------·------------------------------------------------- 79 7. Map showing basaltic lava fields known to be less than 10,000 years old in the contermin')US United States -----------------------------------------------~----------------------------- 80 8. Histogram of heat-generation values obtained in connection with q-A ------------------------ 89 9. Map of observed heat-flow (q) measurements in the United States -------------------------- 94 10. Map of reduced heat-flow ( q*) measurements in the United Sta.tes --------------------------- 96 11. Map showing probable extent of hot, normal, and cold crustal regions ------------------------ 98 12. Graph of temperature profiles for various types of provinces --------------------------------- 101 13. Maps showing locations of hydrothermal convection systems with temperatures above 90°0 and stored heat greater than or equal to 0.3 X 1018 cal ------------------------------------- 111 14. A, Graph showing electric power per well as a function of mass flow for various temperatrres of hot-water and vapor-dominated systems; B, Graph showing electric power per well as a function of value needed to pay for the well for v·arions well costs --------------------- 116 15. Location map showing the extent of the assessed geopressured zones and ·their division into subareas -------------------------------------------------------------------------------- 126 16. Graphs showing variation of well spacing with the ratio of flow rate to the 20-year formation drawdown for each of the conceptual reservoirs ----------------------------------------- 135 iii TABLES Page TABLE 1. Categories of geothermal resource base ------------------------------------------------------- 3 2. Metric units used in this volume ------------------------------------------------------------- 4 3. Identified v·apor-dominated systems of the United States with probable subsurface temperatures exceeding 200°0 -----------------------·------------------------------------------------- 8 4. Identified hot-water convection systems with indicated subsurface temperatures above 150°0 __ 10 5. Identified hot-water convection systems with indicated subsurface temperatures from 90° to 150°0 24 6. Summary of identified hydrothermal convection systems ------------------------------------ 55 7. Magnitudes and heat co~tents of identified volcanic systems ----------------------------------- 59 8. Basic volcanic fields probably less than 10,000 years old -------------------------------------- 81 9. Excess temperature below a low-conductivity layer ------------------------------------------ 87 10. Deficit of temperature below a high-conductivity layer ---------------------------------------- 88 11. Basic calculations: temperatures Tz at depths z for various assumed v-alues of q* and A. ------- 90 12. Heat stored in the depth intervals ~ km and 3-10 km -------------------------------------- 91 13. Heat stored beneath provinces in the depth intervals ~ km and 3-10 km --------------------- 92 14. Heat content above mean annual surface temperature CYf the continental crust ------------------ 93 15. Recovery factors ( er) for electrical power generation ---------------------------------------- 107 16. Estimated potential electric energy from identified high-temperature hydrothermal convection sys- tems ----------------------------------------------------------------------------------- 108 17. Typical values for electric energy produced per kilogram of reservoir fluid ( Wact) as a fpu.ction of source temperatures --------------------------------------------------------------------- 114 18. Drilling cost model -------------------------·------------------------------------------------- 114 19. Resources of hydrothermal convection systems for the generation of electrical power in megawatt centuries ------------------------------------------------------------------------------- 118 20. Intermediate-temperature hydrothermal convection systems wi-th stored heat greater thar or equal to 0.3 X lif8 cal -----------------------·------------------------------------------------- 119 21. Areal extent and average pressure, temperature, and salinity conditions in each subareB -------- 128 22. Assumed thickness ·and properties of sand and shale beds in idealized "conceptual :rese~oirs" -- 129 23.• Calculated aquifer parameters and water properties used in this study ------------------------- 131 24. Assessment of the "fluid resource base" -----·------------------------------------------------- 132 25. Assessment of "recoverable energy" under the assumed basic development plan, Plan 1 --------- 137 26. Estimated heat content of geothermal resource base of the United States ------------------------ 148 27. Geothermal resources of hydrothermal convection systems ------------------------------------ 150 28. Geothermal resources of geopressured sedimentary environments ----------------------------- 151 jy Assessment of Geothef'imal Resources of the United States-1975 Introduction By D. E. White and D. L. Williams Over the past 10 years, various individuals This assessment of geothermal resources differs and organizations have made estimates of the from previous resource statements in that it tabu geotherm·al resources of the United States (White, lates each identified system or subdivision of the t965; Grossling, 1972; Rex and Howell, 1973; major resource categories of table 1, listing the Hickel, 1973 ; N atl. Petrol. Council, 1973). These paran1eters assumed in calculating volumes, heat estimates have differed by several orders of mag contents, and recoverabilities. As technology, eco nitude. This wide variation has been due in part nomic conditions, and our know ledge of specific to lack of or differing assumptions regarding systems change, any of the variables nay be technology and economic conditions, but much of changed to arrive at updated assessments, the uncertainty has been caused by an inadequate Resource-related terms used in this circular are understanding of the nature and extent of the defined as follows : resources themselves. Geothermal resource base includes all of tho stored Although future technology and economic con heat above 15°C to 10 km depth in all 50 ditions continue to be difficult to predict, con states. siderable progress has been made during the past Geothermal resources are defined as storei heat, few years toward ·a better understanding of the both identified ·and undiscovered, that is re resources--enough to improve significantly the coverable using current or near-currert.. tech basis for a comprehensive assessment of the mag nology, regardless of cost. Geothennal re nitude, distribution,