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Tectonic Controls On Fracture Permeability In A Geothermal Reservoir At Dixie Valley Nevada
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Book Synopsis Tectonic Controls on Fracture Permeability in a Geothermal Reservoir at Dixie Valley, Nevada by :
Download or read book Tectonic Controls on Fracture Permeability in a Geothermal Reservoir at Dixie Valley, Nevada written by and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: To help determine the nature and origins of permeability variations within a fault-hosted geothermal reservoir at Dixie Valley, Nevada, the authors conducted borehole televiewer logging and hydraulic fracturing stress measurements in six wells drilled into the Stillwater fault zone at depths of 2--3 km. Televiewer logs from wells penetrating the highly permeable portion of the fault zone revealed extensive drilling-induced tensile fractures. As the Stillwater fault at this location dips S45°E at (approximately) 53° it is nearly at the optimal orientation for normal faulting in the current stress field. Hydraulic fracturing tests from these permeable wells show that the magnitude of S{sub hmin} is very low relative to the vertical stress S{sub v}. Similar measurements conducted in two wells penetrating a relatively impermeable segment of the Stillwater fault zone 8 and 20 km southwest of the producing geothermal reservoir indicate that the orientation of S{sub hmin} is S20°E and S41°E, respectively, with S{sub hmin}/S{sub v} ranging from 0.55--0.64 at depths of 1.9--2.2 km. This stress orientation is near optimal for normal faulting on the Stillwater fault in the northernmost non-producing well, but (approximately) 40° rotated from the optimal orientation for normal faulting in the southernmost well. The observation that borehole breakouts were present in these nonproducing wells, but absent in wells drilled into the permeable main reservoir, indicates a significant increase in the magnitude of maximum horizontal principal stress, S{sub Hmax}, in going from the producing to non-producing segments of the fault. The increase in S{sub Hmaz}, coupled with elevated S{sub hmin}/S{sub v} values and a misorientation of the Stillwater fault zone with respect to the principal stress directions, leads to a decrease in the proximity of the fault zone to Coulomb failure. This suggests that a necessary condition for high reservoir permeability is that the Stillwater fault zone be critically stressed for frictional failure in the current stress field.
Book Synopsis Fracture Permeability and in Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir by : Mark D. Zoback
Download or read book Fracture Permeability and in Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir written by Mark D. Zoback and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reservoir-scale Fracture Permeability in the Dixie Valley, Nevada, Geothermal Field by :
Download or read book Reservoir-scale Fracture Permeability in the Dixie Valley, Nevada, Geothermal Field written by and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wellbore image data recorded in six wells penetrating a geothermal reservoir associated with an active normal fault at Dixie Valley, Nevada, were used in conjunction with hydrologic tests and in situ stress measurements to investigate the relationship between reservoir productivity and the contemporary in situ stress field. The analysis of data from wells drilled into productive and non-productive segments of the Stillwater fault zone indicates that fractures must be both optimally oriented and critically stressed to have high measured permeabilities. Fracture permeability in all wells is dominated by a relatively small number of fractures oriented parallel to the local trend of the Stillwater Fault. Fracture geometry may also play a significant role in reservoir productivity. The well-developed populations of low angle fractures present in wells drilled into the producing segment of the fault are not present in the zone where production is not commercially viable.
Book Synopsis Fracture Permeability and in Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir by :
Download or read book Fracture Permeability and in Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir written by and published by . This book was released on 1999 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have collected and analyzed fracture and fluid flow data from wells both within and outside the producing geothermal reservoir at Dixie Valley. Data from wellbore imaging and flow tests in wells outside the producing field that are not sufficiently hydraulically connected to the reservoir to be of commercial value provide both the necessary control group of fracture populations and an opportunity to test the concepts proposed in this study on a regional, whole-reservoir scale. Results of our analysis indicate that fracture zones with high measured permeabilities within the producing segment of the fault are parallel to the local trend of the Stillwater fault and are optimally oriented and critically stressed for frictional failure in the overall east-southeast extensional stress regime measured at the site. In contrast, in the non-producing (i.e., relatively impermeable:) well 66-21 the higher ratio of S{sub hmin} to S{sub v} acts to decrease the shear stress available to drive fault slip. Thus, although many of the fractures at this site (like the Stillwater fault itself) are optimally oriented for normal faulting they are not critically stressed for frictional failure. Although some of the fractures observed in the non-producing well 45-14 are critically stressed for frictional failure, the Stillwater fault zone itself is frictionally stable. Thus, the high horizontal differential stress (i.e., S{sub Hmax}-S{sub hmin}) together with the severe misorientation of the Stillwater fault zone for normal faulting at this location appear to dominate the overall potential for fluid flow.
Book Synopsis Dixie Valley Synthesis by : David Blackwell
Download or read book Dixie Valley Synthesis written by David Blackwell and published by Lulu.com. This book was released on 2014-09-18 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this report is to summarize U.S. Department of Energy (DOE) supported studies in the Dixie Valley geothermal area and to relate the results of those studies to other, non-DOE-supported studies that have been done in the valley during the past 40 to 50 years. This compilation of past research includes new analysis resulting in a more in-depth understanding of the geothermal system in Dixie Valley. The focus is on the basin geology and structure, thermal regime, and geothermal system geochemistry. Reservoir studies are briefly discussed.
Book Synopsis Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems by :
Download or read book Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems written by and published by . This book was released on 1999 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrologic Properties of the Dixie Valley, Nevada, Geothermal Reservoir from Well-test Analyses by :
Download or read book Hydrologic Properties of the Dixie Valley, Nevada, Geothermal Reservoir from Well-test Analyses written by and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Temperature, pressure, and spinner (TPS) logs have been recorded in several wells from the Dixie Valley Geothermal Reservoir in west central Nevada. A variety of well-test analyses has been performed with these data to quantify the hydrologic properties of this fault-dominated geothermal resource. Four complementary analytical techniques were employed, their individual application depending upon availability and quality of data and validity of scientific assumptions. In some instances, redundancy in methodologies was used to decouple interrelated terms. The methods were (1) step-drawdown, variable-discharge test; (2) recovery analysis; (3) damped-oscillation response; and (4) injection test. To date, TPS logs from five wells have been examined and results fall into two distinct categories. Productive, economically viable wells have permeability-thickness values on the order of 105 millidarcy-meter (mD-m) and storativities of about 10−3. Low-productivity wells, sometimes located only a few kilometers from their permeable counterparts, are artesian and display a sharp reduction in permeability-thickness to about 10 mD-m with storativities on the order of 10−4. These results demonstrate that the hydrologic characteristics of this liquid-dominated geothermal system exhibit a significant spatial variability along the range-bounding normal fault that forms the predominant aquifer. A large-scale, coherent model of the Dixie Valley Geothermal Reservoir will require an understanding of the nature of this heterogeneity and the parameters that control it.
Book Synopsis Geothermal Resources Council Bulletin by :
Download or read book Geothermal Resources Council Bulletin written by and published by . This book was released on 2000 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Geothermal Resources by : Geothermal Resources Council. Annual Meeting
Download or read book Global Geothermal Resources written by Geothermal Resources Council. Annual Meeting and published by . This book was released on 1999 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrocarbon Seal Quantification by : A.G. Koestler
Download or read book Hydrocarbon Seal Quantification written by A.G. Koestler and published by Elsevier. This book was released on 2002-04-29 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains 17 selected papers reflecting the flavour of the Norwegian Petroleum Society conference on hydrocarbon seals quantification and showing the recent significant advances in the understanding and application of hydrocarbon seal methodologies.Three broad categories are covered in this book: methodologies addressing cap-rock integrity, methodologies relating to fault seal and case studies both from the hydrocarbon basins of Northwestern Europe and in the form of outcrop examples. With the North Sea, Norwegian Sea and Atlantic Margin moving along their respective basin maturity and development curves, exploration is being forced deeper into high pressure/high temperature terrains, while exploitation and development requires greater precision and realism in reservoir simulations to maximise drilling strategies to prolong field life. In all instances the need for predictive tools and methodologies that address the integrity and behaviour of top and lateral (fault) seals to hydrocarbon traps, both in the static and dynamic state, have been identified as key risk factors and this is reflected in this volume.
Book Synopsis Federal Geothermal Research Program Update, Fiscal Year 1995 by : Geothermal Research Program (U.S.)
Download or read book Federal Geothermal Research Program Update, Fiscal Year 1995 written by Geothermal Research Program (U.S.) and published by . This book was released on 1996 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Collaboration for Geothermal Energy in the Americas by : Geothermal Resources Council. Annual Meeting
Download or read book International Collaboration for Geothermal Energy in the Americas written by Geothermal Resources Council. Annual Meeting and published by . This book was released on 2003 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis SPE Reservoir Evaluation & Engineering by :
Download or read book SPE Reservoir Evaluation & Engineering written by and published by . This book was released on 2002 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geothermal Reservoir Assessment Case Study, Northern Basin and Range Province, Northern Dixie Valley, Nevada by : University of Nevada, Reno. Mackay Minerals Research Institute
Download or read book Geothermal Reservoir Assessment Case Study, Northern Basin and Range Province, Northern Dixie Valley, Nevada written by University of Nevada, Reno. Mackay Minerals Research Institute and published by . This book was released on 1980 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Workshop Report written by and published by . This book was released on 1998 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geothermal Energy by : Geothermal Resources Council. Meeting
Download or read book Geothermal Energy written by Geothermal Resources Council. Meeting and published by . This book was released on 2002 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dipmeter and Borehole Image Log Technology by : Michael Poppelreiter
Download or read book Dipmeter and Borehole Image Log Technology written by Michael Poppelreiter and published by AAPG. This book was released on 2010-08-25 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Borehole imaging is among the fastest and most accurate methods for collecting high resolution subsurface data. Recent breakthroughs in acquisition, tool design, and modeling software provide real-time subsurface images of incredible detail, from the drill bit straight to a workstation. This text portrays key applications of dipmeter and image log data across the exploration and production life cycle.
