basalt layer seismic processing
Processing tests show that ... 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 ... 20Hz, can be used for sub-basalt seismic imaging and even
Seismic imaging of sub-basalt sedimentary layers is difficult due to high impedance 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 sub-basalt imaging. The basic
A Unique Methodology for Sub Basalt Imaging-Case Study Brajesh Das and Mairaj Fatima SPIC,ONGC Introduction Mesozoic sediments trapped under Deccan basalt in the western flank of India have been a challenge for petroleum exploration. Analysing sub-basalt sediments by seismic surveys has always been a challenge due to the massive nature of basalt.
Using 2-D acoustic finite difference modelling of the guided wave through a simple layered basalt sequence, we consider the relative importance of different parameters of the basalt on the seismic energy propagating through the layers.
Improving Seismic Data Quality by Reprocessing and Redesign of a 3D Survey in an Area of Chaotically-scattered Source-generated Noise ... the strength of the primary wavefield that transmits downwards through the layers of basalt is dramatically reduced due to the strong reflectivity of the basalt layers. ... He started processing in the early ...
When basalt flows interfinger with sediments seismic energy is also lost through internal multiples (Fliedner and White, 2003), which are very difficult to account for in processing. Further, layered basalt intrusions also act like lenses that progressively distort the wavefield ( Reshef et al., 2003 ).
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. The Mesozoic in this area are mostly overlain by the Basalt flows of Late Cretaceous – Early Paleocene age,
The basalt layers result in attenuation of the seismic wave signal and cause broadband . Coal seismic surveying over nearsurface basalts: Experience from . Mar 3, 2014 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.
tional seismic processing, in which the goal is to create a seismic section for structural or n Single-layer acquisition geome-try, associated syn-thetic traces show-ing AVO effect of gas sand, and a multilayer geome-try. Synthetics show amplitude increas-ing with offset (deflections to the left becoming more negative). Although seismic coordinates
We also offer seismic data processing services. Our seismic data processing team uses the latest commercial and in-house developed software, to provide services to a range of national and international clients. ... the high-velocity basalt layer absorbs preferentially the higher frequencies in the incident wavelet, degrading the achievable ...
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) ].
This thick basalt layer obscures the deeper potentially prospective sedimentary section. 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).
Abstract Imaging below the basalt for hydrocarbon exploration is a global problem because of poor penetration and significant loss of seismic energy due to scattering, attenuation, absorption and mode-conversion when the seismic waves encounter a highly heterogeneous and rugose basalt layer.
Sub-Basalt Imaging West of Shetland. In order to achieve sufficient bandwidth in areas where high frequencies are limited, it is necessary to extend the low frequencies. Lower frequencies are affected less by attenuation, and provide greater accuracy and stability for seismic inversion.
Multifocusing Seismic Processing to Improve Poor Response Areas below Basalt Layers, Canadon Asfalto Basin, Argentina Conference Paper (PDF Available) · …
Seismic refraction across the La Bajada Fault Yusliza Mohd Sufian UNIVERSITY OF TEXAS AT AUSTIN SAGE 2004 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 …
This Technology is being widely used in Russia for 2D and 3D Seismic survey with a success to image beyond sub-Basalt layer." --184.108.40.206 16:55, 31 October 2011 (UTC) The photo titled thumper trucks is actually of a fleet of Vibroseis "buggies". Thumper trucks almost always act alone.
Further, there can be strong inhomogeneities within the salt/basalt. That makes it difficult to reconstruct a structural image of the subsurface below the top salt/basalt interface. Determining the thickness and structure of sediment packages covered by a layer of salt or basalt is very challenging using seismic …
Sub-basalt Imaging through Anisotropic Pre-Stack Depth Migration The Challenge In the Cambay Basin, Oil and Natural Gas Company Ltd. ("ONGC"), the national oil corporation of India, wanted to image the Mesozoic sediments below a basalt layer of varying thickness. The basalt layer is a highly reflective trap that caused problems
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 reverse-shooting shallow seismic …
Abstract: Sub-Salt and Sub-Basalt Imaging Using Long Offset and Multicomponent Seismic Data. Introduction Exploration in potential hydrocarbon producing areas beneath high-velocity layers (HVL) is typically hindered by a variety of seismic propagation effects. Dramatic elastic-impedance contrasts between the HVL and regional sedimentary ...
The result will enable geoscientists to optimise data acquisition, processing, inversion and interpretation strategies for other areas with severe basalt layers worldwide. The exact processing and joint inversion strategies have been elaborated and validated using both 2- and 3-D synthetic data (see main project results 1 & 5 this document) as ...
The first layer is a thin layer of very dry weathered basalt, with an average value of ρ = 8430 Ohm.m, and at a depth ranging from 1 to 7.5 m. The value of apparent resistivity in the second layer is about ρ > 4000 Ohm.m and at depth ranging from 7.5 to 20 m, which might be com-prised of fresh basalt. The third layer has an apparent
New seismic reflection data have been used to image intra- and sub-basalt features beneath the Faroe–Shetland Basin in the North Atlantic, where the highly reflective top and base boundaries of flood basalts and their complex internal structure make successful seismic imaging difficult. This study demonstrates that appropriate acquisition and processing of marine seismic data from hydrophone ...
In this paper, we present a reprocessing case study that applies the latest processing technologies in seismic migration to improve the images below the basalt layers. The highlight of this effort is the application of the Controlled Beam Migration (CBM) and associated velocity depth model building.
Jul 24, 2014· These factors need be integrated as per adequate modern workflows of seismic design, data processing and integrated interpretation: • Seismic design: Stacked basalt flow contains sequences of thin layers, hence reflected and transmitted energy at each layer causes loss of high frequency information.
Advanced processing of long-offset seismic data for sub-basalt imaging in the Faeroe-Shetland Basin Hassan Masoomzadeh* and Penny J. Barton, University of Cambridge, Satish C. Singh, IPG Paris Summary the linear noise of ringing and multiplication, arrive tangentially at about the time of the reflection signal from A specialized strategy for long-offset data processing is the sub-basalt targets.
Sub-basalt imaging has become an prospectivity occur below the Deccan traps, few geoscientific important topic in geosciences communities, as targets are studies have been carried out so far because of inadequate obscured by the distinct elastic wave behaviour of the basalt. seismic data and the sub-basalt imaging problems.
The internal structure of the basalt sequence is based on the observations from well logs and seismic. It consists of many thin layers with varying resistivities which are sensed as one thick anisotropic layer due to low resolution of the EM methods.
Imaging below the basalt for hydrocarbon exploration is a global problem because of poor penetration of seismic energy. There is significant loss of energy due to scattering, attenuation, absorption and mode-conversions when the seismic waves encounter a highly heterogeneous and rugose basalt layer.
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