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Processing and interpretation of reflection seismic data from a basaltcovered area Significant parts of the Norwegian Sea and adjacent northeast Atlantic Ocean have a basalt cover at shallow depth In much of this area there are prospective petroleum resources both beneath and intercalated with the basalt
These basalt layers create problem for seismic energy propagation such as absorption high impedance acoustic barriers the interbed multiple generation diffraction due to irregular interfaces etc As a result seismic imaging suffers from problematic velocity determinations Bringing
Integrated seismic and electromagnetic model building applied to improve subbasalt depth imaging hanced seismic data acquisition and processing or from other basalt layer as well as the sediment and basement structures underneath
A three step methodology was utilized to construct the image of subbasalt sediments 1 getting of the image and velocity model of the lowvelocity sediments above basalt including its top by processing of the reflected waves at nearoffset 06 km 2 construction of the basalt layer model by reflected waves observed at faroffset 616 km
through the basalt layer hence the seismic image quality becomes very poor Therefore it is necessary to develop proper seismic data acquisition and processing techniques to deal with different types of waves generated as mentioned above through a numerical simulation using elastic fullwave
there are two seismic reflectors where the second reflector is associated with a water table at a depth range of 125 m to 230 m This reflector is considered the surface of the third seismic layer that represents groundwater saturated fractured basalts The abrupt and remarkable increase in the depth of the second layer is due to faulting
Modern SubBasalt Seismic Imaging Figure 4 Successive crosslines undertaken on the 3D overunder survey in the westcoast off India display numerous features under basalt such as the sag basin fractures faults and folding KT boundary layer is clearly seen as major change in frequency content
The chemical interaction between carbon dioxide water and basalt is a common process in the earth which results in the dissolution of primary minerals that later precipitate as alteration
basalt there are discontinuous and irregular refraction and diffraction waves in the section These waves impede the discrimination of signal part of recorded waves seriously An important factor for seismic waves propagating downward through basalt layers is the wave mode conversion occurred in high velocity layer
Jul 24 2014· It deals with deep seated features of seismic sections the seismic resolution of synrift subsalt and sub basalt layers These are performed mainly by time and depth migrated interpretation of seismic in the context of basin formation source rock maturation migration and entrapment and by integrating diverse geophysical data 2
use of seismicreflection techniques to map shallow layers in the repetitive basaltsand environment of the eastern Snake River Plain has been successful in the 75 to 450m depth range Miller et al 1988 FIELD PROCEDURES The seismic reflection data were recorded using a standard CDP acquisition method Mayne 1962
Outline Objectives Data processing Results Conclusions Objective To find layers deeper than the basalt layer below 80 m depth using the wide angle reflection method SAGE 2004 Seismic Line Data Processing Deconvolution Wide angle reflection method T2 vs X2 method Deconvolution to eliminate reverberation and some of surface waves Example Wide angle reflection Definition reflection where
Multifocusing Seismic Processing to Improve Poor Response Areas below Basalt Layers Canadon Asfalto Basin Argentina
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
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
and interbed multiples between top basalt and the seabed may compound the complexity of the multiple energy The basalt ''layer'' may contain multiple flows with erosion and sedimentation occurring between the flows This can lead to strong absorption within the basalt and also significant scattered energy with short spatial wavelengths
between the two basalt layers Paleocene and Santonian traps while preserving the integrity of the data above the basalt Two of the main challenges are the poor signaltonoise ratio and complex ray paths due to multipathing associated with the basalt layers Earlier processing using prestack Kirchhoff time and depth migration failed to
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 basebasalt and subbasalt events From our tests varying layer thickness and source frequency a synthetic 2D fractal model which produces seismic similar to real subbasalt seismic has been created
Seismic wave propagation in media with highvelocity layers basalts can be described as an interference of various events commonly referred to as wave types or modes Proposed here is the eventbased processing sequence that enhances and migrates a chosen set of locally coherent arrivals such as PP reflections and mode conversions
of the basalt layer the roughness of the top and bottom of the basalt layer and sometimes the heterogeneities within the basalt layer In this thesis we identify specific problems within the modern imaging technology which limit subbasalt imaging
Abstract Shallow seismic refraction survey of the low velocity layer LVL is vital part of seismic data acquisition processing and interpretation as it influences seismic reflection travel time In the southern part of Kenya a total of 90 forward and reverseshooting shallow
massive nature of basalt Modern seismic Acquisition techniques coupled with advanced processing techniques have upgraded the quality of seismic imaging Processing strategies need to focus on addressing the fundamental geologic features that impact seismic data quality In this study an attempt has been made to better understand the
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