Breakthroughs in seismic and borehole characterization of ...

In this paper we summarize the acquisition and processing of the multi-component seismic swath, and present observations on the integration of P- and S- waveform sonic logs with information from resistivity-based image logs to determine regional and local stress tensors and to improve identification of subsurface basalt lithofacies. 2. Seismic ...

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Seismic wave propagation through an extrusive basalt sequence

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.

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Sub-basalt Imaging Using Broadside CSEM

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) ].

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Improvement of sub-basalt imaging using parabolic tau-p ...

presence of basalt flows covering potential hydrocarbon exploration targets. Such basaltic layers (up to several kilometers of stacked flows) create enormous problems for imaging underlying structures using conventional seismic acquisition and processing methods. Scattering from the

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CGG: Deghosting

Deghosting. The source and receiver ghosts created in marine acquisition form a secondary wavefield that corrupts the recorded data, and whose appearance depends on offset, time and geologic dip. There are three different processing stages where this secondary wavefield can be dealt with. The best approach to use can vary from project to project.

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Acoustic waveform inversion of ocean-bottom node seismic ...

image a low velocity layer situated beneath a high velocity layer such as basalt. In this paper, we show that early arrival waveform inversion (EAWI) has the ability to see the low velocity layer underneath the basalt using ONGC ocean-bottom node (OBN) seismic data. As we have used only the PP data with constant density assumption, EAWI

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Subbasalt Seismic Processing Strategy for the GlyVeST Data ...

Subbasalt Seismic Processing Strategy for the GlyVeST Data from the Faroes – A Modeling Study ... To design a processing strategy for these data, we carried out a numerical seismic modeling to create ... Sediment layers up to 10 m thick between basalt beds are found within the LBF and UBF, but most interbasaltic sediment layer in these two ...

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Improving Seismic Data Quality by Reprocessing and ...

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 ...

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Wide angle reflection at the La Bajada Fault

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 …

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Seismic imaging through the volcanic rocks of the Snake ...

quence of basalt flows originating from a series of vents. The final site, Mountain Home, is located in a fault-bounded sed-imentary basin with both surface and buried basalt layers. Here, we discuss surface and borehole results using vertical seismic profiling (VSP) and surface seismic methods to show

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Integrated seismic and electromagnetic model building ...

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.

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Uses of wide‑azimuth and variable‑depth streamers for sub ...

streamers for sub‑basalt seismic imaging To evaluate the optimal technique for imaging beneath a complex basalt layer, Robert Dowle,1* Fabrice Mandroux,1 Robert Soubaras,1 and Gareth Williams2 compare dense wide-azimuth and broadband towed streamer acquisition solutions when deployed in an experimental survey in the Faroe-Shetland Basin. A

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Abstract: Sub-Salt and Sub-Basalt Imaging Using Long ...

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 ...

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Determining the Basaltic Sequence Using Seismic Reflection ...

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

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Seismic properties of layer 2 basalts - ResearchGate

Seismic properties of layer 2 basalts ... Daley et al., 2004], but seismic monitoring in basalt environments ... is more effectively used and behavior is more clearly linked to processing. A ...

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Shallow seismic reflection survey near a radioactive ...

meters of basalt, rhyolite, and sediments of Cenozoic age. In some areas within the Snake River Plain, as much as 1 km of interbedded basalt and sediments lies on top of older, rhyolitic volcanic rocks (Walker, 1964). The basalt flows in the upper 150 m of the Snake River Plain are mostly compound pahoehoe flows, 3-to-5-m

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A Unique Methodology for Sub Basalt Imaging-Case Study

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.

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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic ...

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.

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Basalt Layer Seismic Processing - Aluneth Heavy Machinery

We have basalt layer seismic processing,Basalt Layer Seismic Processing This thick basalt layer obscures the deeper potentially prospective sedimentary section This is one of the most important aspects of subbasalt seismic processing Velocity picks must take into account the geological model and be guided by the seismic interpreter Top basalt is an obvious seismic pick and further picks should ...

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Event-based sub-basalt depth imaging applied to marine ...

Event-based sub-basalt imaging applied to marine seismic data from north of Shetland, UK. Norwegian Journal of Geology vol 88, pp 167-183. Trondheim 2008. ISSN 029-196X 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.

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Sub-basalt imaging using full-wave elastic finite ...

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 full-wave

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Seismic processing basics - AAPG Wiki

It is thus understandable that considerable time and effort is expended in any processing project on the final parameters of seismic display so as to satisfy the individual tastes of the interpreter. Such things as frequency content, gain, trace spacing, and type of display are all up for grabs (see “Displaying seismic …

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Processing and interpretation of reflection seismic data

Processing and interpretation of reflection seismic data from a basalt-covered 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.

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1 Z-99 MULTI-WAVE-TYPE SUB-BASALT IMAGING

Z-99 MULTI-WAVE-TYPE SUB-BASALT IMAGING A. DROUJININE1, S. BUCKNER2 ... after Radon pre-processing has strong potential for imaging basalt layers and sub-basalt targets. ... A high impedance contrast between sediments and volcanic units is proving to be a major problem for seismic imaging in the North Atlantic margin, from Norway to Ireland ...

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Identification of Paleo-Volcanic Rocks on Seismic Data

Special seismic processing must be utilized to calculate attributes from prestack data, ... but al so layers of hyaloclastic rocks within basalt lava flows. These were deposited as debris fr om the cooling pillow lava flow. Due to their fragility and re-deposition processes, only …

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(PDF) Multifocusing Seismic Processing to Improve Poor ...

Multifocusing Seismic Processing to Improve Poor Response Areas below Basalt Layers, Canadon Asfalto Basin, Argentina Conference Paper (PDF Available) · …

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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic ...

Mar 16, 2018· 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. The conventional (short offset) seismic data acquisition, processing and modeling techniques adopted by …

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Experience with the issue of seismic surveying over basalts

up-going reflections from layers below the basalt are clearly seen. For the seismic reflection survey, advanced seismic data processing techniques such as pre-stack depth migration were able to improve the continuity of the coal seam reflections across the zone affected by the basalt. No special acquisition parameters were required.

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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic ...

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.

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Structual imaging

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 …

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Issues in processing seismic data from complex areas

variable topography and lateral velocity changes each caused problems for seismic data acquisition and processing as they gave rise to seismic signal attenuation, noise contamination and distortions of arrival times. The issues of imaging below a high velocity thrust layer are similar to those of imaging beneath basalt and have not yet been ...

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basalt layer seismic processing - oheuvelink.nl

gathers for processing facilitates the processing of the actual seismic data by allowing existing geological knowledge to complement datadriven velocity determinations. Introduction The sub basalt seismic imaging is problem in KrishnaGodavari basin. Event though the modalities ofDetails. Get price

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Sub-basalt imaging problems and the application of ...

A specific case, which is of great interest to petroleum exploration companies, occurs on continental shelf areas where potentially hydrocarbon-bearing strata are overlain by extensive extrusive igneous rocks. In this situation, standard seismic processing is often unable to resolve the structure beneath such basalt layers.

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