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Technical Content

Technical Abstract

Practical strategies for interbed multiple attenuation

SEG - Society of Exploration Geophysicists | Gaurav Dutta, Hui Huang, Karthik Kanakamedala, Bin Deng, and Ping Wang, CGG © 2019 SEG

Interbed multiples cause artifacts in subsurface images because they are incorrectly migrated when using standard primary-based migration algorithms. While surface-related-multiple-elimination has been well established as a standard step in seismic processing, the usage of interbed multiple attenuation (IMA) remains low due to various practical ...

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Technical Abstract

Foothills structural model de-risking with 3D magnetotellurics

SEG - Society of Exploration Geophysicists | Federico Miorelli, Randall Mackie, Wolfgang Soyer (CGG) ; Wolfang Soyer (TOTAL) © 2019 SEG

Geophysical imaging in the foothills environment is typically hampered by complex structure, and the high cost of data acquisition in poorly accessible, rugged topography. Seismic imaging is particularly difficult due to poor signal penetration, steeply dipping structures and irregular data coverage. The use of ...

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Technical Abstract

Designing an Exploration Scale OBN: Acquisition design for subsalt imaging and velocity determination

SEG - Society of Exploration Geophysicists | Joakim Blanch, Jon Jarvis, Chris Hurren, (BHP), Yan Liu, Lingli Hu (CGG). © 2019 SEG

Direct wave arrivals are the most robust signals to determine velocity and consequently they have been used for almost a century in hydrocarbon exploration. The reason is simple as the arrival time is explicitly available. In order to acquire these direct arrivals in a ...

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Technical Abstract

Improving images under complex salt with ocean bottom node data

SEG - Society of Exploration Geophysicists | Yuan Yao*, Hongda Ma, Yan Liu, Chao Peng (CGG); Gopal Mohapatra, Gregory Duncan, Wisley Martins (Hess), Steve Checkles (Formerly Hess) © 2019 SEG

Subsalt imaging at Stampede field in the Gulf of Mexico has remained challenging for decades due to the existence of a large and complex sediment inclusion inside thick tabular salt. Recently, appropriate full-waveform inversion (FWI) algorithms have been developed for automatic salt model updating ...

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Technical Abstract

Sparse nodes for velocity: Learnings from Atlantis OBN full-waveform inversion test

SEG - Society of Exploration Geophysicists | Jiawei Mei*, Zhigang Zhang, Feng Lin, Rongxin Huang, Ping Wang (CGG); Cheryl Mifflin (BHP) © 2019 SEG

As the key step in subsalt imaging, conventional salt model building has typically relied on manual interpretation of the salt geometry, which proves to be difficult for resolving complex salt models. As a result, subsalt imaging has been approaching a plateau in the last ...

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Technical Abstract

Internal multiple attenuation for OBN data with overburden/target separation

SEG - Society of Exploration Geophysicists | Roberto Pereira, Mena Ramzy, Petre Griscenco, Benjamin Huard, Hui Huang, Luis Cypriano, and Adel Khalil © 2019 SEG

Areas with complex overburdens pose a major challenge for seismic imaging of deep targets. Reduced illumination can compromise velocity estimation and the image at the target level. A solution to this problem is given by ocean bottom node (OBN) acquisitions. They provide increased illumination ...

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Technical Abstract

Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI

SEG - Society of Exploration Geophysicists | Florian Jouno, Adriano Martinez, Denis Ferreira, Daniela Donno, and Adel Khalil (CGG) © 2019 SEG

Santos Basin has become one of the most prospective oil provinces in the world. Due to the geological complexity, OBN acquisition has emerged as an imaging solution. It provides the full-azimuth and long-offset illumination FWI needs to realize its potential. Given the right data ...

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Technical Abstract

Least-squares RTM with ocean bottom nodes: potentials and challenges

SEG - Society of Exploration Geophysicists | Yan Liu, Yi Chen, Hongda Ma, Chao Peng (CGG); Gopal Mohapatra, Wisley Martins, Gregory Duncan (Hess), Steve Checkles (Formerly Hess) © 2019 SEG

Stampede field is a faulted subsalt four-way reservoir in Green Canyon, Gulf of Mexico. Imaging for part of the field has remained challenging due to interference from the complex overburden, which carries large velocity errors and creates non-uniform illumination for the subsalt. Before correcting ...

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Technical Abstract

Updating salt model using FWI on WAZ data in the Perdido area: benefits and challenges

SEG - Society of Exploration Geophysicists | Ravi Kumar, Huifeng Zhu, Vivek Vandrasi, Don Dobesh (CGG); Alfredo Vazquez (Pemex) © 2019 SEG

In this case study, we discuss the impact of using a not-so-appropriate Wide Azimuth Data (WAZ) data which lacks good usable low frequencies and long offset full azimuth coverage for FWI based model building. We use Time-Lag FWI (TLFWI) demonstrated to be an appropriate ...

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