Hydraulic observations from a 1 year fluid production test in the 4000 m deep KTB pilot borehole

A long‐term pump test was conducted in the KTB pilot borehole (KTB‐VB), located in the Oberpfalz area, Germany. It produced 22 300 m³ of formation fluid. Initially, fluid production rate was 29 l min^?1 for 4 months, but was then raised to an average of 57 l min^?1 for eight more months. The aim of this study was to examine the fluid parameters and hydraulic properties of fractured, crystalline crusts as part of the new KTB programme ‘Energy and Fluid Transport in Continental Fault Systems’. KTB‐VB has an open‐hole section from 3850 to 4000 m depth that is in hydraulic contact with a prominent continental fault system in the area, called SE2. Salinity and temperature of the fluid inside the borehole, and consequently hydrostatic pressure, changed significantly throughout the test. Influence of these quantities on variations in fluid density had to be taken into account for interpretation of the pump test. Modelling of the pressure response related to the pumping was achieved assuming the validity of linear Darcy flow and permeability to be independent of the flow rate. Following the principle ‘minimum in model dimension’, we first examined whether the pressure response can be explained by an equivalent model where rock properties around the borehole are axially symmetric. Calculations show that the observed pressure data in KTB‐VB can in fact be reproduced through such a configuration. For the period of high pumping rate (57 l min^?1) and the following recovery phase, the resulting parameters are 2.4 × 10^?13 m³ in hydraulic transmissivity and 3.7 × 10^?9 m Pa^?1 in storativity for radial distances up to 187 m, and 4.7 × 10^?14 m³ and 6.0 × 10^?9 m Pa^?1, respectively, for radial distances between 187 and 1200 m. The former pair of values mainly reflect the hydraulic properties of the fault zone SE2. For a more realistic hydraulic study on a greater scale, program FEFLOW was used. Parameter values were obtained by matching the calculated induced pressure signal to fluid‐level variations observed in the KTB main hole (KTB‐HB) located at 200 m radial distance from KTB‐VB. KTB‐HB is uncased from 9031 to 9100 m and shows indications of leakage in the casing at depths 5200–5600 m. Analysis of the pressure record and hydraulic modelling suggest the existence of a weak hydraulic communication between the two boreholes, probably at depths around the leakage. Hydraulic modelling of a major slug‐test in KTB‐HB that was run during the pumping in KTB‐VB reveals the effective transmissivity of the connected formation to be 1 to 2 orders of magnitude lower than the one determined for the SE2 fault zone.     

Merchant identities,trading nodes,and globalization: Introduction to the Special Issue

ABSTRACT

The contributors to this Special Issue are concerned by the nature of transregional Asian interactions taking place in the field of commerce. They explore this concern through an examination of the experiences, activities, and histories of commodity traders whose life trajectories criss-cross Asia. The articles share a common geographic point of reference: Yiwu – an officially designated ‘international trade city’ located in China’s eastern Zhejiang province. The introduction to the Special Issue analytically locates the individual papers in relationship to a long-standing body of work in anthropology and history on port cities and trading nodes. In so doing it suggests the importance of considering multiple historical processes to understanding Yiwu and its position in China and the world today, as well as, more generally, for the anthropology of ‘globalization from below’.     

Investigation of coupled hydraulic–geomechanical processes at the KTB site: pressure‐dependent characteristics of a long‐term pump test and elastic interpretation using a geomechanical facies model

The German Continental Deep Drilling Program comprising a pilot borehole down to 4000 m and a main borehole down to 9101 m in southeast Germany (KTB) is continuing to provide a unique opportunity for the identification of important factors and processes in deep‐seated fluid and energy transfer. In situ stress conditions significantly impact flow, transport and exchange characteristics of fracture networks that dominate the permeability of crystalline reservoir rocks. In this paper, several scales of information are combined to present a fully three‐dimensional hydraulic finite element model of the principal KTB fault zones, and linked to a geomechanical model describing the alteration of the hydraulic parameters with stress changes caused by fluid extraction. The concept of geomechanical facies is introduced to define and characterize architectural elements in the subsurface system. Evaluation of a long‐term pump test in the KTB pilot hole, June 2002–July 2003, coupled with a geomechanical model gives an insight into some of the elastic and nonelastic processes controlling hydraulic transport in the basement rocks. Trends in the decline of the permeability and the degree of storage in the system could only partially be explained by elastic processes, clearly indicating the importance of nonelastic processes. A number of inelastic processes are suggested as areas for further research.     

Archaeology and the Late Modern State: Introduction to the Special Issue

While archaeologists have always shown great interest in the rise and fall of premodern states, they perennially show little interest in their own. This is particularly troubling because the state is the nexus of power in archaeology. In practice, virtually all archaeology is state archaeology, imbued with and emboldened by state power. It is in this light that contributors to this Special Issue of Archaeologies grapple with the archaeology–state nexus, addressing such timely issues as colonialism, capitalism, and cultural resource or heritage management (CRM/CHM). We outline here the archaeology–state nexus concept and introduce the Special Issue.     

Privatization: Property and the Remaking of Nature–Society Relations Introduction to the Special Issue

Abstract: The Western Alaska Community Development Quota (CDQ) is an economic development program that allocates a portion of regional fisheries to groups representing poor, mostly indigenous people of western Alaska. The CDQ groups lease their quota to industrial fish firms and reinvest their revenues back into the fishery. In this way, quota becomes a form of property used for capital accumulation. The CDQ is conceptually confusing because it appears as neoliberal privatization and as redistribution motivated by social justice. Rather than choosing between these, this paper argues that quota‐as‐property brings together these seemingly opposed goals. Once the idea of property is expanded to include interdependence and reasons for property relations, it is possible to see that privatization in the CDQ embodies multiple logics without being incoherent. The paper concludes that the complex social relations of property open up space for identifying diverse practices within neoliberalism.     

Developments in Polish Scholarship on German History, 1945-2000: Introduction to the Special Issue

This introduction points out major developments in Polish scholarshipon German history between the end of the war and the presentday. The fraught relationship between Polish and German scholarswas not merely a result of the destruction of the war yearsbut older nationalist traditions of history-writing, which needto be taken into account as well as the status of partitionedPoland between 1795 and 1918.     

Advancing Policy Theory with Cultural Theory: An Introduction to the Special Issue

Cultural Theory (CT) is a constructivist theory, developed by Mary Douglas, Aaron Wildavsky, and others, that seeks to participate in the positivist project of discovering, explaining, and predicting regularities in human behavior. Special Issue contributions and this introduction suggest some ways in which this theory can help advance policy studies. One way CT can help is by further specifying other approaches to policy theory. Thus, Hank Jenkins‐Smith and his collaborators argue (and with respect to belief systems demonstrate) that the theory can be used to specify belief systems, coalitions, and causes of policy change in the Advocacy Coalition Framework (ACF); Rob Robinson uses CT to specify further both sources of resistance to policy change and sources of dramatic policy change in Punctuated Equilibrium Theory (PET); and Christopher Weare, Paul Lichterman, and Nicole Esparza use the theory to specify sources of collaboration in policy networks as well as sources of network dissolution. Other contributors argue and/or demonstrate that CT can help specify the culturally pluralized conditions for successful policy deliberation, the cultural sources of policy narratives, and how cultural biases are likely to interact with policy frames. This Special Issue invites policy scholars to consider how the theory might help advance their research interests and the field.     

Introduction to Zooarchaeological Method and Theory: a Special Issue Honoring R. Lee Lyman

The Society for American Archaeology presented R. Lee Lyman with the Fryxell award for Interdisciplinary Excellence in Zooarchaeology in 2011. Lyman has produced over 120 journal articles or book chapters, and four single-authored books on the topic, and this issue honors his contributions to zooarchaeological method and theory with six original pieces by his peers. Arguably, his greatest impact has been in the field of vertebrate taphonomy and the development of a means to measure density-mediated bone attrition, but of equal importance was emphasis in the discipline that unit selection, or what one measures, should be linked to a particular research question. Lyman's work has also stressed the importance of making zooarchaeology relevant to modern issues of conservation biology.     

The ESR geochronology and geology of the open‐air Palaeolithic deposits in Bollschweil,Germany*

This paper presents ESR (electron spin resonance) ages of rhinoceros and equine tooth enamel from the open‐air Palaeolithic site of Bollschweil on the western edge of the Black Forest near Freiburg, Germany. Bollschweil is one of very few archaeological sites in southern Germany to yield Lower or Middle Palaeolithic faunal and lithic materials from a buried, open‐air context. The geological context of the archaeological remains indicates that the loessic sediments have been reworked. Excavation at this site yielded a cold‐period fauna characterized by bones of mammoth, horse, large bovids and wooly rhinoceros. In the absence of any clear chronostratigraphic marker horizons, the age of the finds could not be determined without the use of a chronometric dating method. Lithic artefacts from the site, including a handaxe and a side scraper, suggest either a Middle Pleistocene or early Late Pleistocene age. The ESR dating results indicate that the deposit enclosing the archaeological finds should be assigned to oxygen isotope stage (OIS) 6, although there exists some possibility that some teeth were deposited later, in OIS 5.