Login| Library| Events|Contact| Home
Home > Media & Events > Industry Articles

Industry Articles

The SeisAble Benefits of CGG technologies and services are regularly featured in the industry press. Find out more by consulting our e-library of published industry articles. Narrow your search by entering at least one search criterion:

Category Where Published: When Published:
Keyword(s): Author(s):

Results: 149

Benefits of integrated approaches for solving imaging challenges presented by complex geology: latest developments in marine wide- and full-azimuth surveysBenefits of integrated approaches for solving imaging challenges presented by complex geology: latest developments in marine wide- and full-azimuth surveys
First Break, November, 2014
Conrad Judd | Risto Siliqi | Fabrice Mandroux | Jo Firth | Chu-Ong Ting
Summary
To improve the image of complex geology demands an acquisition design that respects the anticipated imaging challenges. Broadband recording and increased spatial sampling can improve the resolution of sedimentary layers and can lead to improved facies discrimination and high-resolution tomography. Low-frequency strength and ultra-long offsets can contribute to subsalt penetration and provide better definition of overburden velocities as a result of FWI. High signal-to-noise ratio, particularly at low frequencies, provided by quiet solid streamers, stabilizes inversions for reservoir characterization purposes. Increased azimuth content brings better illumination as well as facilitating improved multiple attenuation, and also leads to better constraints on anisotropy.
Complex structural imaging of transition zones in Bohai Bay, China, by OBC technologyComplex structural imaging of transition zones in Bohai Bay, China, by OBC technology
Leading Edge, November, 2014
Xiao-Gui Miao | Wei Yan | Yong Xia Liu | Kunlun Yang
Summary
We have demonstrated the advantage of OBC data acquisition using SeaRay and advanced imaging technologies through the Bohai case study. Compared with a conventional raybased Kirchhoff migration technique, HFCBM provides superior structural imaging for the area with complex geology and steep faults and improves the signal-to-noise ratio in the data effectively. Combined with PZ summation, shallow-water demultiple, and TTI model building, this workflow provides a promising solution for resolving imaging issues in the complex fault system and in the middle to deep low-S/N zone in the Bohai area.
CGG Horda survey heralds new strategyCGG Horda survey heralds new strategy
Seismic Profile, October, 2014
Idar Horstad | Erling Frantzen | Jo Firth
Summary
CGG had not acquired a lot of new data in Norway over recent years, but in 2013 the company made a step-change in its activity in this prolific region and launched a plan to grow quickly and become the market leader. The combination of BroadSeis? and BroadSource? broadband technology with local geological knowledge lies at the core of CGG?s revised strategy in the region. New surveys have been acquired on the Halten Terrace, in the Barents Sea and Denmark. The real breakthrough came with the launch of the Horda survey on the eastern rim of the northern Viking Graben commencing in 2014
The search for oil in the South-Eastern Barents SeaThe search for oil in the South-Eastern Barents Sea
Geo Expro, October, 2014
Sylvia Beate Hammersvik | Gustav Aagenes Ersdal
Summary
In 2013 CGG acquired a large 3D seismic survey, FIN13, west of the former disputed area, covering the northern part of the Finnmark Platform and the western extension of the Tiddlybank Basin. The new 3D survey was acquired with CGG?s proprietary BroadSeis technology to produce broader bandwidths and deliver sharper wavelets without sidelobes. These provide more detailed imaging, allowing better identification of prospects and leads.
Enhanced imaging with high resolution full waveform inversion and reverse time migration: a North Sea OBC case studyEnhanced imaging with high resolution full waveform inversion and reverse time migration: a North Sea OBC case study
Leading Edge, September, 2014
Andrew Ratcliffe | Antonio Privitera | Graham Conroy | Vetle Vinje
Summary
We show how the use of Full Waveform Inversion (FWI) and Reverse Time Migration (RTM) dramatically improves the imaging in the complex geology in the Tommeliten Alpha area of the Norwegian North Sea. In To improve the imaging we push our FWI algorithm to 22 Hz to generate an extremely high resolution velocity model. RTM is then required to honor the complexity in the resultant velocity model. Consequently, we migrate with the FWI velocity model and generate a high frequency RTM image to 80 Hz. We conclude by discussing the subsequent impact that the combination of FWI and RTM has on the interpretation of the area, together with some possible avenues of future investigation
Caspian Sea: frontier exploration in the Middle Caspian BasinCaspian Sea: frontier exploration in the Middle Caspian Basin
Geo Expro, September, 2014
Gregor Duval | Jaswinder Mann
Summary
The study area covers the offshore Middle Caspian Basin within Russia and Kazakhstan. A regional 2D seismic grid has been used to assess the area?s petroleum geology. This CGG multi-client dataset consists of 81 long-offset 2D seismic lines extending over 10,000 line kilometres across the Middle Caspian Basin. Just over 5,000km were acquired in the Russian sector in 1995 and subsequently reprocessed by CGG in 2009 while another 5,000km of modern seismic were acquired and processed in 2010 in the Kazakh sector.
Benefit of Full Azimuth and Ultra-long Offset Data for Subsalt Imaging in Deep Water Gulf of MexicoBenefit of Full Azimuth and Ultra-long Offset Data for Subsalt Imaging in Deep Water Gulf of Mexico
Leading Edge, September, 2014
Yunfeng Li | Qiaofeng Wu | Minshen Wang | Tony Huang
Summary
In the deep-water regions of the Gulf of Mexico, our ability to image subsalt structures has improved significantly with wide-azimuth data, reverse time migration, and anisotropic tomography and imaging. However, subsalt imaging, such as steeply dipping salt flanks and subsalt three-way closures, still remains difficult in areas with complex salt geometry. Moreover, limited subsalt illumination provides insufficient incident angles for residual curvature analysis and velocity updating. Full azimuth and long offset acquisition configurations are the latest acquisition technology designed to address these subsalt challenges. This paper presents improved subsalt imaging and tomography update from a staggered acquisition, which provides both full azimuth data coverage and ultra-long offsets.
Increasing the accuracy of microseismic monitoring using surface patch arrays and a novel processing approachIncreasing the accuracy of microseismic monitoring using surface patch arrays and a novel processing approach
First Break, July, 2014
Estelle Rebel | Jelena Kostadinovic | Thomas Bardainne | Malgorzata Chmiel
Summary
In this paper, we present a novel acquisition technique to further decrease the noise recorded at the surface of the Earth when monitoring hydraulic stimulation. We argue that the wellhead is not the only source of noise in such cases; it is in fact one of the less important ones. Based on this observation, and building upon recent advances in seismic acquisition, we have developed a practical and highly efficient acquisition design, namely a patch array approach. It offers a wide variety of noise cancellation methods while remaining easy to deploy in the field. In addition, we have developed a suite of processing schemes (Macault and Bardainne, 2014; Chmiel and Bardainne, 2014) that take full advantage of the patch array design. We will present them herein, and demonstrate the benefits of such processing techniques within a case study.
12345678910...