Sub-basalt imaging problems and the application of ...
In the presence of thick, laterally extensive basalt layers, seismic reflection sections are typified by a high amplitude top basalt reflector and the absence of base-basalt and sub-basalt events. From our tests, varying layer thickness and source frequency, a synthetic 2-D fractal model, which produces seismic similar to real sub-basalt seismic, has been created.
Advances in seismic imaging through basalts: a case study ...
The top boundary of the basalt sequence is defined by a strong reflection with a steep velocity increase from 3.5 km s–1 to 4.5 km s–1 in the c. 200 m thick layer above it. The basalt sequence here is c. 2.5 km thick. Beneath the base of the basalt there is a velocity decrease from 5.8 km s–1 to 5.2 km s–1.
Experience with the issue of seismic surveying over basalts
processing have been tested to improve the quality of seismic sections in the basalt covered areas. These techniques include long offset seismic data acquisition (Ryu, 1997), low-frequency sources (Ziokowski et al., 2002) and prestack depth migration (Fruehn ., 2001). Improved results have been et al reported in the petroleum industry.
Seismic wave propagation through an extrusive basalt ...
Apr 01, 2016 · Typically, the refracted wave from the basaltic layer is used to build a velocity model by tomography. This velocity model is then used to aid processing of the reflection data where direct determination of velocity is ambiguous, or as a starting point for full waveform inversion, for example.
Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic ...
Mar 16, 2018 · Since basalt is highly heterogeneous, a significant amount of incident seismic energy is attenuated, converted and scattered while propagating through the basalt layer, hence the seismic image quality becomes very poor.
(PDF) Multifocusing Seismic Processing to Improve Poor ...
Multifocusing Seismic Processing to Improve Poor Response Areas below Basalt Layers, Canadon Asfalto Basin, Argentina
(PDF) FAEROE SUB-BASALT SEISMIC IMAGING – A NEW ITERATIVE ...
The imaging of sedimentary sequences laying beneath strongly absorbing formations such as the Faeroe Basin Basalt Body can be improved by processing seismic data using a non conventional approach.
Seismic properties of layer 2 basalts - ResearchGate
Weathering of sea-floor basalt, should it penetrate to any considerable depth in layer 2, will decrease layer 2 seismic refraction velocities, act as a source of geothermal heat, and substantially ...
Sub-Basalt Imaging in Indian offshore - Concerns and ...
basaltic layers with conventional seismic acquisition and processing methods as the complex basalts scatter and highly attenuate seismic energy. Also, generally weak sub basalt signal may be obscured by the short period multiples from intra- basalt boundaries.
Improving Seismic Data Quality by Reprocessing and ...
In the study area, a 3D seismic project was recorded in 1997 and has been used to demonstrate the application of a design method for a new acquisition. Now, this seismic is being reprocessed up to Prestack Depth Migration (PSDM), to obtain the best possible data.
(PDF) Coal seismic surveying over near-surface basalts ...
At the first mine, the basalt is relatively deep (114 m) and relatively thin (20 m). Conventional seismic acquisition and processing of a 2D seismic line provide poor results.
Event-based sub-basalt depth imaging applied to marine ...
Seismic wave propagation in media with high-velocity layers (basalts) can be described as an interference of various events commonly referred to as wave types or modes. Proposed here is the event-based processing sequence that enhances and migrates a chosen set of locally coherent arri-vals such as PP reflections and mode conversions.
Effect of flood basalt stratigraphy on the phase of ...
ity strength between 2150 and 2300 m depth. Compound basalt flows and mudstone layers are found between 2150 and 2900 m depth. The final sequence contains mudstones, hyaloclastites, and basalts. Unsurprisingly, the power spectrum of the reflection coefficient series in Figure 2b is deficient at low frequencies. VERTICAL SEISMIC PROFILE DATA PROCESSING
(PDF) Advanced processing of long-offset seismic data for ...
Advanced processing of long-offset seismic data for sub-basalt imaging in the Faeroe-Shetland Basin Hassan Masoomzad eh* and Penny J. Barton, University of Cambridge, Sa tish C. Singh, IPG Paris
Seeing below the basalt – offshore Faroes - Gallagher ...
Dec 17, 2007 · Research has shown that basalt layers scatter the higher seismic frequencies (Pujol and Smithson 1991; Hobbs 2002) and deep towing of receiver cables can extend the seismic bandwidth towards lower frequencies (Ziolkowski et al. 2002).
Sub-basalt Imaging Using Broadside CSEM - EMGS
below a basalt layer. However, due to shape irregularities and het erogeneities with high velocity contrasts around and within the basalts, it can be challenging for seismic processing to image the base of the basaltic layer and details of what is below . [For example, s ee Fliedner and White (2001) ].
Sub-basalt Multiple and Noise Suppression Using a Dense ...
Dense marine wide-azimuth sub-basalt recording. Analysis and Results Full processing of the data muting. Figure 3 shows the result of the onboard QC stack using a picked velocity field but no de-multiple other than the stack.
CSEM and MMT in the use for sub-basalt structure outside ...
can be hidden below a basalt layer. However, due to shape irregularities and heterogeneities with high velocity contrasts around and within the basalts, it can be challenging for seismic processing to image the base of the basaltic layer and details of what is below. Hence, methods
Sequestration of CO in Basalt Formations
Goal: Determine dependence of metal carbonate formation on the properties of adsorbed water films. Experimental Conditions : Constant temperature (50° C) and pressure (90 …