Geophysical interpretations of the southern Española Basin, New Mexico, that contribute to understanding its hydrogeologic framework / V.J.S.Grauch et al.; prepared in cooperation with the New Mexico Office of the State Engineer. - Reston: U.S. Geological Survey, 2009. - vi, 87 p.: col. ill., col. maps. + 1 CD-Rom. - (U.S. Geological Survey professional paper; 1761). - Ref.: p.67-73. - ISBN 978-14-1-132365-0  Место хранения:   018 | Институт нефтегазовой геологии и геофизики им. А.А.Трофимука | Новосибирск | Библиотека

Оглавление / Contents

Executive Summary ............................................... 1 Introduction .................................................... 3 Objectives, Approach, and Hydrogeologic Significance ............ 3 Elements of the Basin Floor .................................. 5 Elements of Basin Fill ....................................... 9 Structure .................................................... 9 Geologic Setting ................................................ 9 Data Types and Descriptions .................................... 12 Physical Properties ......................................... 12 Aeromagnetic Data ........................................... 13 Gravity Data ................................................ 18 Other Data .................................................. 18 Methods of Data Analysis ....................................... 20 Edge Detection .............................................. 20 Magnetic Anomaly Separation ................................. 21 Magnetic Depth Estimation ................................... 21 Model Construction ............................................. 24 Gravity Inversion ........................................... 24 Profile Models .............................................. 27 Integrated Three-Dimensional Model .......................... 31 Interpreted Elements of the Basin Floor ........................ 35 Precambrian Basement ........................................ 35 Pre-Rift Sedimentary Section ................................ 41 Intrusions .................................................. 44 Older Volcanic Rocks ........................................ 50 Interpreted Elements of Basin Fill ............................. 52 Santa Fe Group Sediments .................................... 52 Younger Volcanic Rocks ...................................... 57 Interpreted Structure .......................................... 57 Summary ........................................................ 65 Description of Digital Products ................................ 66 Acknowledgments ................................................ 66 References Cited ............................................... 67 Appendix 1. Well Data Used to Constrain Three-Dimensional Integrated Model and Gravity Inversion ............ 77 Appendix 2. Well Data Used to Guide Three-Dimensional Integrated Model .................................. 82 Appendix 3. Magnetic Depth Estimation Methods Used in This Study ............................................. 84 Appendix 4. Other Point-Located Data .......................... 86 Plates 1. Composite of Selected Geophysical Interpretations at 1:100,000 Scale (in pocket and on CD) 2. Geologic Units Inferred to Directly Underlie the Santa Fe Group at 1:100,000 Scale (on CD) Figures 1-3. Maps showing: 1. Española Basin and areas used for various analyses ........ 4 2. Key basin elements addressed by geophysical interpretation ............................................ 6 3. Generalized geology and geography of the study area ...... 11 4. Diagrams showing magnetic property information for geologic units in study area ............................. 14 5-9. Maps showing: 5. Coverage of high-resolution aeromagnetic surveys ......... 17 6. Isostatic residual gravity and station locations for area of gravity analyses ................................. 19 7. First vertical derivative of reduced-to-pole aeromagnetic data ........................................ 22 8. Broad magnetic anomalies enhanced by lowpass filters ..... 23 9. Data coverage and types of independent constraining data used for gravity inversion .......................... 26 10. Diagram showing simplified density-depth functions developed from borehole density logs in the Albuquerque and Española Basins ...................................... 27 11-13 Maps showing: 11. Elevation of base of basin fill derived from gravity inversion ................................................ 28 12. Bedrock gravity map derived from gravity inversion ....... 29 13. Section lines and data used to construct three- dimensional integrated model ............................. 30 14. Two sections demonstrating three-dimensional model and forms of input ........................................... 34 15. Aeromagnetic map showing labels on interpreted sources of selected features ..................................... 36 16. Isostatic residual gravity map for study area ............ 37 17. Two-dimensional gravity and magnetic model for Tesuque profile .................................................. 38 18. Geologic map and aeromagnetic image of southeastern part of study area ....................................... 39 19. Geologic map and aeromagnetic image of northeastern part of study area ....................................... 40 20. Two-dimensional gravity and magnetic model for Pojoaque profile .................................................. 42 21. Sections through three-dimensional model showing general relations between three modeled surfaces ......... 43 22. Two-dimensional gravity and magnetic model for Alamo Creek profile ............................................ 45 23-29 Maps showing: 23. Aeromagnetic image, interpretations, and geology of southern part of study area .............................. 46 24. First vertical derivative image, interpretations, and thickness of Santa Fe Group in southern part of study area ..................................................... 48 25. Elevation of base of Santa Fe Group, derived from three-dimensional model .................................. 54 26. Isopach thickness of Santa Fe Group, derived from three-dimensional model .................................. 55 27. Comparison of bases of Ancha and underlying Tesuque Formations in southern part of study area ................ 56 28. Demonstration of horizontal-gradient magnitude method used to interpret faults from magnetic data .............. 59 29. Geologically mapped and geophysically interpreted faults in study area ..................................... 60 30. Two-dimensional gravity and magnetic model for Seton Village profile .......................................... 61 31. Map showing geologically mapped and geophysically interpreted faults on base of Santa Fe Group surface ..... 63 32. Perspective view of basin model in relation to topography ............................................... 64 Tables 1. Interpretation approach and constraints for key basin elements ................................................... 7 2. Densities of geologic units ............................... 15 3. Bodies used in two-dimensional geophysical profile models ................................................... 32 4. Digital georegistered files ............................... 67