Papers by johannes singer
We review a general representation for retrieving seismic Green’s functions between two observati... more We review a general representation for retrieving seismic Green’s functions between two observation points in lossless arbitrary inhomogeneous media and evaluate its application for passive seismic exploration. The theory is validated with a field example, in which several coherent events are retrieved from seismic background-noise recordings in a desert area. Results match well with events in an active exploration data set at the same location. The retrieval of the Earth’s reflection response from crosscorrelations of seismic noise recordings can provide valuable information, which may otherwise not be available due to limited spatial distribution of seismic sources, difficult terrain conditions, economical reasons, etc.
Fugro is a worldwide oil and gas service operator with the core business of data acquisition offs... more Fugro is a worldwide oil and gas service operator with the core business of data acquisition offshore, onshore and in the air. In a world with increasingly complex and costly systems being installed, often in remote, harsh or difficult to access environments, large scale continuous monitoring of these valuable and critical assets is becoming an increasingly important challenge. These monitoring systems need to collect wide variety of data: strain, sound, vibrations, pressure, temperature etc. FAZ Technology as part of the Fugro group has developed an ultra-high performance data acquisition system based on fiber optics, perfectly suited for acquiring large amounts of system and structural health and status data. We will present the concept, its performance and capabilities, and we’ll present real field applications. A core example will be a system installed on the Fugro offshore survey vessel Pioneer, which monitors a large suite of performance and health data of this vessel allowing...
64th EAGE Conference & Exhibition
SPE Asia Pacific Oil and Gas Conference and Exhibition, 2002
The seismic signal of the earth in the frequency range 0.1–20 Hz is recorded continuously from th... more The seismic signal of the earth in the frequency range 0.1–20 Hz is recorded continuously from the surface using ultra-sensitive velocity sensors. Hydrocarbon reservoirs are characterised by a unique spectral signature present in the frequency range 1–6 Hz. This signature diminishes at the rim of the reservoir and is absent at non-reservoir locations. The results of our experiments are remarkably uniform for a great number of major oil producing areas worldwide, regardless if producing or virgin reservoirs are examined. Phenomenologically and structurally, the observed signals are similar to previously documented tremor signals ("continuous narrow band ground motion") originating, for example, from volcanoes and glaciers ("fluid-induced tremor"). Numerous continuous seismic signals exist which are usually rather weak and are often considered as useless background noise only. However, this "noise" also carries useful information, which is identified thro...
SEG Technical Program Expanded Abstracts 2009, 2009
Proceedings of the 8th SEGJ International Symposium, 2006
Seg Technical Program Expanded Abstracts, 2006
Physica C: Superconductivity, 1997
Physica C: Superconductivity
Fiber Optic Sensors and Applications XIV
Fiber Optic Sensors and Applications XIII, 2016
Optical Sensing and Detection IV, 2016
International Journal of Modern Physics C, 1993
We implemented a parallel Swendsen–Wang algorithm for a 2D Ising system without magnetization in ... more We implemented a parallel Swendsen–Wang algorithm for a 2D Ising system without magnetization in a host–node programming model. The simulations were performed on the Intel Hypercube IPSC/860. Our maximum number of updates/s on 32 nodes ist three times as high as in the implementation by Stauffer and Kertész on the same machine. With 32 processors we reach half the speed of the simulations by Tamayo and Flanigan on 256 nodes of a CM5. We discuss the non–equilibrium relaxation for the energy and the magnetization.
Symmetry and Pairing in Superconductors, 1999
Uploads
Papers by johannes singer