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basalt layer seismic processing

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 ...

Modelling complex near-surface features to improve shallow ...

basalt has been found. Note that the holes with basalt often have quite low near-surface velocities. An examination of these boreholes suggests that they include interbedded high and low velocity zones. The modelled seismic record suggests that most of the signal of the seismic reflection is swamped within the ground roll cone.

4. Seismic velocity - Stanford University

Stanford Rock Physics Laboratory - Gary Mavko Parameters That Influence Seismic Velocity 74 Typical rock velocities, from Bourbié, Coussy, and Zinszner, Acoustics of Porous Media, Gulf Publishing.

(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 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: MODELING AND DEMULTIPLE

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

Use of Synthetic CMP Gathers for Velocity Guidance in Sub ...

driven and model driven velocity model building in seismic imaging. To limit the degree of freedom of such a procedure the velocity determination above basalt, within the basalt layer and below basalt is constrain by seismo-geological information. The types of geological constraints adopted were derived from nearby wells and from the

basalt layer seismic processing - elthamlodge.co.za

This is one of the most important aspects of sub-basalt seismic processing. Investigation of the Low Velocity Layer using . Investigation of the Low Velocity Layer using Shallow Seismic ... found that the olivine basalt layers of the Kirikiti platform are ... 3.2 Data Processing ... Sub-basalt seismic imaging using optical-to ...

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 ...

Broadband processing of West of Shetland data

In terms of seismic response, the high impedance contrasts at the water-bottom and at the top of the basalt gives rise to prominent reflections and strong multiples. Additionally, severe attenuation takes place within the alternating layers of basalt and silt and …

Which books are best for studying seismic processing ...

I think this link would help you Processing Techniques for Wide-angle Seismic Data Imaging structures underneath basalt layers has been a challenge for the hydrocarbon exploration industry. A new processing strategy has been implemented to enhance...

Seismic Research Papers - Academia.edu

—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.

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

(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) · …

38. SEISMIC PROPERTIES OF FLOOD BASALTS FROM HOLE …

in this study, with focuses on (1) evaluating the seismic characteris-tics of the flood basalt sequence by processing and inversion of sonic waveform data, and (2) conducting detailed log-core correlation, en-abled by high core-recovery and high-quality FMS images. STRATIGRAPHY OF HOLE 917A

Seismic challenges in high impact Lower Tertiary ...

Seismic imagings of prospective reservoir targets in the region have been problematic due to extensive Tertiary basalt. The basin lies in water depths ranging from approximately 200 m (656 ft) to more than 1,000 m (3,281 ft) and is divided into both UK and Faroe offshore territories, with the Faroe area covered in a thick layer of basalt.

Wide angle reflection at the La Bajada Fault - lanl.gov

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 …

Investigation of the Low Velocity Layer using Shallow ...

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 …

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

Mar 16, 2018· 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.

Directional filter aided sub-basalt interpretation: A case ...

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 ).

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.

Modern Sub-Basalt Seismic Imaging - Deepwater Realm ...

Modern Sub-Basalt Seismic Imaging Figure 4: Successive cross-lines undertaken on the 3D over-under survey in the west-coast off India display numerous features under basalt such as the sag basin, fractures, faults and folding. K-T boundary layer is clearly seen as major change in frequency content.

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

01 sub basalt-imaging - SlideShare

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.

Target Orientated noise elimination to improve Sub-Basalt ...

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,

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.

Deep Downhole Seismic Testing for Earthquake Engineering ...

1 Deep Downhole Seismic Testing for Earthquake Engineering Studies Kenneth H. Stokoe, II1, Songcheng Li2, Brady Cox3, Farn-Yuh Menq4 and Alan Rohay5 1 Professor, Dept. of Civil, Architectural and Environmental Engineering, Univ. of Texas at Austin, TX 2 Engineer, 2H Offshore, Houston, TX 3 Assistant Professor, Dept. of Civil Engineering, Univ. of Arkansas-Fayetteville, AR

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 ...