Application of Borehole Geophysics in the Characterization of Flow in Fractured Rocks PDF Download
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Author: F. L. Paillet
Publisher:
ISBN:
Category : Aquifers
Languages : en
Pages : 42
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Book Description
Author: F. L. Paillet
Publisher:
ISBN:
Category : Aquifers
Languages : en
Pages : 42
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Book Description
Author: F. L. Paillet
Publisher:
ISBN:
Category : Geophysical well logging
Languages : en
Pages : 36
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Book Description
Author: Committee on Fracture Characterization and Fluid Flow
Publisher: National Academies Press
ISBN: 0309563488
Category : Science
Languages : en
Pages : 568
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Book Description
Scientific understanding of fluid flow in rock fractures--a process underlying contemporary earth science problems from the search for petroleum to the controversy over nuclear waste storage--has grown significantly in the past 20 years. This volume presents a comprehensive report on the state of the field, with an interdisciplinary viewpoint, case studies of fracture sites, illustrations, conclusions, and research recommendations. The book addresses these questions: How can fractures that are significant hydraulic conductors be identified, located, and characterized? How do flow and transport occur in fracture systems? How can changes in fracture systems be predicted and controlled? Among other topics, the committee provides a geomechanical understanding of fracture formation, reviews methods for detecting subsurface fractures, and looks at the use of hydraulic and tracer tests to investigate fluid flow. The volume examines the state of conceptual and mathematical modeling, and it provides a useful framework for understanding the complexity of fracture changes that occur during fluid pumping and other engineering practices. With a practical and multidisciplinary outlook, this volume will be welcomed by geologists, petroleum geologists, geoengineers, geophysicists, hydrologists, researchers, educators and students in these fields, and public officials involved in geological projects.
Author:
Publisher:
ISBN:
Category : Engineering geology
Languages : en
Pages : 14
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Author:
Publisher:
ISBN:
Category : Aquifers
Languages : en
Pages : 19
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Book Description
Nearly a decade of intensive geophysical logging at fractured rock hydrology research sites indicates that geophysical logs can be used to identify and characterize fractures intersecting boreholes. However, borehole-to-borehole flow tests indicate that only a few of the apparently open fractures found to intersect boreholes conduct flow under test conditions. This paper presents a systematic approach to fracture characterization designed to define the distribution of fractures along boreholes, relate the measured fracture distribution to structure and lithology of the rock mass, and define the nature of fracture flow paths across borehole arrays. Conventional electrical resistivity, gamma, and caliper logs are used to define lithology and large-scale structure. Borehole wall image logs obtained with the borehole televiewer are used to give the depth, orientation, and relative size of fractures in situ. High-resolution flowmeter measurements are used to identify fractures conducting flow in the rock mass adjacent to the boreholes. Changes in the flow field over time are used to characterize the hydraulic properties of fracture intersections between boreholes. Application of this approach to an array of 13 boreholes at the Mirror Lake, New Hamsphire site demonstrates that the transient flow analysis can be used to distinguish between fractures communicating with each other between observation boreholes, and those that are hydraulically isolated from each other in the surrounding rock mass. The Mirror Lake results also demonstrate that the method is sensitive to the effects of boreholes on the hydraulic properties of the fractured-rock aquifer. Experiments conducted before and after the drilling of additional boreholes in the array and before and after installation of packers in existing boreholes demonstrate that the presence of new boreholes or the inflation of packers in existing boreholes has a large effect on the measured hydraulic properties of the rock mass surrounding the borehole array.
Author: AE. Hess
Publisher:
ISBN:
Category : Boreholes
Languages : en
Pages : 14
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Book Description
The U.S. Geological Survey has developed a thermal-pulse flowmeter capable of detecting borehole flows to as small as 0.04 L/min. This new flowmeter provides much greater sensitivity to slow vertical flow than that available using conventional spinner flowmeters. This paper describes five applications of the thermal-pulse flowmeter in the characterization of the hydrology of fractured rocks. These applications include measurement of flows in boreholes driven by ambient hydraulic-head differences, identification of fractures contributing flow during production tests, inference of fracture interconnections during aquifer tests, interpretation of water-quality contrasts in boreholes, and identification of fractures affected by hydraulic stimulation procedures. Each of the five applications is illustrated by specific examples selected from ongoing research activities at various fracture hydrology study sites.
Author: F. L. Paillet
Publisher:
ISBN:
Category : Geophysical well logging
Languages : en
Pages : 52
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Book Description
... Presents geophysical well-log data and interpretations used to identify and characterize fractures and to analyze fracture distribution and fracture flow at a site in south-central MA; data include borehole wall images, caliper logs that indicate the distribution of fractures in five boreholes located along the axis of the distribution of contaminated wells and flowmeter profiles obtained under ambient hydraulic-head conditions and during injection tests ...
Author: Kamini Singha
Publisher:
ISBN:
Category : Geophysical well logging
Languages : en
Pages : 4
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Book Description
Author: F. L. Paillet
Publisher:
ISBN:
Category : Geophysical well logging
Languages : en
Pages : 44
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Book Description
