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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic

2018-3-16  The key to successful imaging below basalt is to understand how the seismic waves propagate through it at different times for a given seismic source. 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.

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(PDF) Advanced processing of long-offset seismic

Seismic imaging in the Faeroe-Shetland basin faces the common sub-basalt imaging difficulties. Strong reflectivity caused by the significant velocity contrast between the top basalt and the young sediments above reflects a major part of the seismic

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Coal seismic surveying over near-surface basalts

At the first mine, the basalt is relatively deep (114m) and relatively thin (20m). Conventional seismic acquisition and processing of a 2D seismic line provided poor

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Advanced processing of long-offset seismic data for sub

Seismic imaging in the Faeroe-Shetland basin faces the common sub-basalt imaging difficulties. Strong reflectivity caused by the significant velocity contrast between the top basalt and the young...

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Experience with the issue of seismic surveying over basalts

2019-3-22  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.

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Sub-Basalt Imaging Using Broadside CSEM EMGS

2011-6-6  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) ]. Hence, methods th at improv e mapping of basalt and the sediments below will be of great value for the petroleum industry.

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Determining the Basaltic Sequence Using Seismic

2013-12-24  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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Sub-basalt imaging problems and the application of

2001-12-1  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.

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Enhancing Sub Basalt Imaging Using Depth Domain

2018-1-24  by a massive basalt layer having very high velocity (~5000 m/s) .The top basalt layer is resolved in conventional processed section (fig.3).The base of basalt layer could be resolved in PSTM output but, only up to certain extent in the NNE part of the profile. The roughness of the basalt top is well resolved in PSDM stack output. The PSDM section

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SUB-BASALT IMAGING: MODELING AND DEMULTIPLE

2021-5-18  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

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Experience with the issue of seismic surveying over basalts

2019-3-22  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.

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38. SEISMIC PROPERTIES OF FLOOD BASALTS FROM

1998-6-22  SEISMIC PROPERTIES OF FLOOD BASALTS FROM HOLE 917A DOWNHOLE DATA, tics of the flood basalt sequence by processing and inversion of sonic waveform data, and (2) conducting detailed log-core correlation, en- 0.6-m-thick sediment layer separates the Middle and Upper Series.

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Sub-basalt seismic imaging using optical-to-acoustic

2010-2-1  Sub-basalt seismic imaging using optical-to-acoustic model building and wave equation datuming processing. in the case of sub-basalt seismic exploration, suggest a processing scheme for imagery improvement. The same procedure was applied to the Ulster White Limestone Formation underlying the basalt layer, where two populations of

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Advances in seismic imaging through basalts: a case

2005-5-1  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

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Determining the Basaltic Sequence Using Seismic

2013-12-24  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

get price

Coal seismic surveying over near-surface basalts

sub-basalt imaging problem. PSDM is a seismic imaging processing technique often used for imaging complex structures with strong lateral velocity variation such as sub-salt imaging (Yilmaz, 2001). The use of this technique for sub-basalt imaging has been demonstrated by a number of authors including Fruehn et al. (2001), Gallagher and Dromgoole

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Target Orientated noise elimination to improve Sub

2017-11-23  Keywords: Sub-basalt, Low-frequency, Wave field analysis, Wide angle seismic imaging Introduction Sub-basalt plays are receiving increasing interest in the exploration for oil and gas. Besides basalt acting as a direct seal for hydrocarbon accumulations, there are a variety of traps that can be hidden below a basalt layer. Seismic

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Sub-basalt imaging: modeling and demultiple

Abstract. 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.

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Sub basalt imaging: A case study from Offshore India

2017-7-25  seismic data processing based techniques in the past years. Clari-Fi® is TGS's proprietary processing based broad band seismic technique. Clari-Fi® Amplio® is a processing based broad band technique particularly designed to address low frequency boosting to address problems such as the sub-basalt imaging challenge where the high frequencies

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SUB-BASALT IMAGING: MODELING AND DEMULTIPLE

2021-5-18  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

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Experience with the issue of seismic surveying over basalts

2019-3-22  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.

get price

Advances in seismic imaging through basalts: a case

2005-5-1  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

get price

Determining the Basaltic Sequence Using Seismic

2019-3-22  Field Procedures and Data Processing . Seismic Reflection method . the fourth layer, the fifth layer and the bottom of fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depends on the combination with other subsurface data sources in order to

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Determining the Basaltic Sequence Using Seismic

2013-12-24  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

get price

Sub-Basalt Imaging Using Broadside CSEM EMGS

2011-6-6  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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Effect of flood basalt stratigraphy on the phase of

2016-7-8  Effect of flood basalt stratigraphy on the phase of seismic waveforms recorded offshore Faroe Islands Juerg Schuler 1, ceous and clay-rich mudstone layer leads to a decrease of reflectiv-ity strength between 2150 and 2300 m depth. Compound basalt thus their data processing steps were basically the same. After re-

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Detection of subsurface faults with seismic and magnetic

2017-5-21  and the underlying basalt layer is markedly erosional, and scours in the top of the basalt are filled with coarse sand, sometimes containing basalt debris and chert-pebble con-glomerate. Weathering of the rather common chert-pebble and cobble conglomerates has produced a desert pavement. Seismic refraction acquisition and interpretation

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江陵凹陷北部高速玄武岩下二维广角地震初探

2004-3-20  A Preliminary Study on 2-D Wide Angle Seismic Profiling in Area of High Velocity Basalt Layer in the Northern Jiangling Depression,Hubei Province HU Zhong-ping1 2, GU Lian-xing1, WANG Liang-shu1, HU Wen-xua1, WU Da-li2

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Identification of Paleo-Volcanic Rocks on Seismic Data

2018-9-25  Special seismic processing must be utilized to calculate attributes from prestack data, Massive basalt flows, indicative of sub aqueous cones and small plateaus with a thickness overlain by a layer with vaulted and less regular offsets. The upper layer is more brittle than

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Sub-basalt imaging in the Faroe-Shetland Basin using

2014-12-5  of the basalt layer as well as sub-basalt strata have been pub-lished. For instance Fruehn et al. (2001) and White et al. (2003) used long offset rst arrivals for travel-time tomogra-phy in order to determine the sub-basalt velocities. However, the resulting velocity

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