نتایج جستجو برای: overburden conductivity

تعداد نتایج: 51818  

Journal: :Exploration Geophysics 2021

Formulae for the moments of magnetic field response can be derived simple models which have conductivities that vary suddenly as a function depth (thin and thick sheets) or not at all (half space). In companion paper we expressions conductivity-depth profile varies smoothly, taking form Gaussian function. this apply model to data from Russell South, an area in Athabasca Basin Canada. The low si...

2015
Paul Michaels

The Idaho Transportation Department (ITD) commissioned a geophysical study to aid in the design of a replacement for an existing concrete span bridge. Because the river current was too swift to place geophones in the river, the solution was to shoot p-wave profiles in a reciprocal geometry (phones on land, shots in the river). In addition to the refraction work, a down-hole seismic profile was ...

Journal: :IEICE Transactions 2015
Andreas Chwala Ronny Stolz Matthias Schmelz Vyacheslav Zakosarenko Matthias Meyer Hans-Georg Meyer

Forty years after the first application of Superconducting Quantum Interference Devices (SQUIDs) [1], [2] for geophysical purposes, they have recently become a valued tool for mineral exploration. One of the most common applications is time domain (or transient) electromagnetics (TEM), an active method, where the inductive response from the ground to a changing current (mostly rectangular) in a...

2013
Amit G. Pandey Prashant Singh

Due to rapidly growing energy needs and the resultant rise in the use of coal to meet them, exploration and exploitation of coal resources has seen exponential growth. Global concerns about the environmental impact of coal exploitation have led to an increasing shift to open-cast mining of coal, in place of the traditional deep-pit mining. This has led to search for a suitable method of handlin...

1999
Katherine G. Jackson

In 1960, Trusheim described three evolutionary stages of salt movement (pillow, diapir, and postdiapir) recorded in adjacent sediments by three types of peripheral sinks (primary, secondary, and tertiary). Assuming that overburden rocks were viscous, Trusheim interpreted such evolutionary stages as typical of buoyant Rayleigh-Taylor instabilities. We use mechanical reasoning and physical models...

Journal: :Wireless Communications and Mobile Computing 2016
Jiaxun Lu Zhengchuan Chen Pingyi Fan Khaled B. Leatief

With the increase of physical antenna and subcarrier numbers in MIMO-OFDM systems, channel side information feedback amount and signal precoding complexity overburden will consume much more system resource, even become intolerable. To solve this problem, previous works mainly focused on fixed subcarrier grouping size and precoded MIMO signals in the same group with unitary channel state informa...

2017
Thomas Planès Roel Snieder Satyan Singh

Standard model-based redatuming techniques consist in applying time shifts to the surface data, to simulate an acquisition made at depth. The time shifts are computed using prior knowledge of the overburden, such as a macro velocity model. These techniques allow focusing of the direct waves at the new datum, but the focus can be degraded because of surface multiples and internal multiples in th...

Journal: :Economics of Education Review 1986

2007
Rongrong Lu Mark Willis Xander Campman Jonathan Ajo-Franklin Nafi Toksöz

We describe a new short cut strategy to image the sediments and salt edge around a salt flank through an overburden salt canopy. We demonstrate its performance and capabilities on a synthetic acoustic seismic data from a Gulf of Mexico (GOM) style model. In this strategy, we first redatum the surface shots from a walk away Vertical Seismic Profile (WVSP) survey to be as if the source and receiv...

2015
Joost van der Neut Kees Wapenaar

Interferometric redatuming is a data-driven method to transform seismic responses with sources at one level and receivers at a deeper level into virtual reflection data with both sources and receivers at the deeper level. Although this method has traditionally been applied by cross-correlation, accurate redatuming through a heterogeneous overburden requires solving a multidimensional deconvolut...

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