Case Study: A Large 3D Wide-Azimuth Ocean-Bottom Survey in the Deepwater Gulf of Mexico

2007 ◽  
Author(s):  
Richard Clarke ◽  
Ganyuan Xia ◽  
Nurul Kabir ◽  
Laurent Sirgue ◽  
Scott Michell
Keyword(s):  
Gulf Of Mexico ◽  
Ocean Bottom

Case Study: A Large 3D Wide-Azimuth Ocean-Bottom Survey in the Deepwater Gulf of Mexico

2007 ◽  
Author(s):  
Richard Clarke ◽  
Ganyuan Xia ◽  
Nurul Kabir ◽  
Laurent Sirgue ◽  
Scott Michell
Keyword(s):  
Gulf Of Mexico ◽  
Ocean Bottom

Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico

Geophysics ◽  
2018 ◽  
Vol 83 (4) ◽  
pp. B167-B181 ◽  
Author(s):  
Jiliang Wang ◽  
Priyank Jaiswal ◽  
Seth S. Haines ◽  
Patrick E. Hart ◽  
Shiguo Wu
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Seismic Data ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Ocean Bottom ◽  
Full Waveform ◽  
Sonic Log ◽  
Obs Data

We present a case study of gas hydrate quantification using dense short-offset multichannel seismic (MCS) and sparse long-offset ocean-bottom-seismometer (OBS) data in lease block Green Canyon 955 (GC955), Gulf of Mexico (GOM), where the presence of gas hydrate was interpreted using logging while drilling (LWD) data acquired by the GOM Gas Hydrate Joint Industry Project Leg II expedition. We use frequency-domain full-waveform inversion (FWI) of seven OBS gathers to invert for a P-wave velocity model of an approximately 7 km long MCS profile connecting two LWD sites, GC955-H and GC955-Q. We build the starting model for FWI using traveltime inversion (TI) of the MCS and OBS data. In addition, we use the TI model for depth migrating the MCS stack. At the LWD sites, we constrain the hydrate saturation ([Formula: see text]) using sonic and resistivity logs. Unfortunately, as is typical of seismic quantification problems, the FWI model resolution is not sufficient to extrapolate the LWD-based [Formula: see text]. Therefore, we apply Backus averaging to the sonic log, at 60 m wavelength, bringing it within approximately 8% of the FWI model and make the assumption that averaging the sonic log is same as redistributing the gas hydrate within the Backus wavelength. In this manner, instead of [Formula: see text], the FWI model is able to estimate the total gas hydrate volume. In the end, we use the FWI model and the migrated stack to constrain the locations and bulk volumes of free gas and gas hydrate. Our results demonstrate that with careful processing, reasonable estimates on locations and bulk volumes of submarine gas hydrate accumulations can be achieved even with sparse seismic data that are not adequate for amplitude-based assessments.

Ocean-bottom-node full-wavefield inversion for subsalt imaging: A case study from Gulf of Mexico

2021 ◽  
Author(s):  
Yaxun Tang ◽  
Xu Li ◽  
Young Ho Cha ◽  
Sunwoong Lee ◽  
Spyros Lazaratos ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Ocean Bottom ◽  
Subsalt Imaging ◽  
Wavefield Inversion

A PREVIEW TO THE DIGITAL COMPONENT IN THE NEW WIRELINE FORMATION TESTING ERA: GULF OF MEXICO CASE STUDY

2020 ◽  
Author(s):  
German Garcia ◽  
◽  
Hadrien Dumont ◽  
Simon Edmundson ◽  
Chris Babin ◽  
...  
Keyword(s):  
Gulf Of Mexico

scholarly journals Ocean-Bottom Seismographs Based on Broadband MET Sensors: Architecture and Deployment Case Study in the Arctic

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 3979
Author(s):  
Artem A. Krylov ◽  
Ivan V. Egorov ◽  
Sergey A. Kovachev ◽  
Dmitry A. Ilinskiy ◽  
Oleg Yu. Ganzha ◽  
...  
Keyword(s):  
Site Response ◽  
The Arctic ◽  
Laptev Sea ◽  
Ocean Bottom ◽  
Arctic Seas ◽  
Shirshov Institute ◽  
Study Results ◽  
Ocean Bottom Seismographs ◽  
The Laptev Sea

The Arctic seas are now of particular interest due to their prospects in terms of hydrocarbon extraction, development of marine transport routes, etc. Thus, various geohazards, including those related to seismicity, require detailed studies, especially by instrumental methods. This paper is devoted to the ocean-bottom seismographs (OBS) based on broadband molecular–electronic transfer (MET) sensors and a deployment case study in the Laptev Sea. The purpose of the study is to introduce the architecture of several modifications of OBS and to demonstrate their applicability in solving different tasks in the framework of seismic hazard assessment for the Arctic seas. To do this, we used the first results of several pilot deployments of the OBS developed by Shirshov Institute of Oceanology of the Russian Academy of Sciences (IO RAS) and IP Ilyinskiy A.D. in the Laptev Sea that took place in 2018–2020. We highlighted various seismological applications of OBS based on broadband MET sensors CME-4311 (60 s) and CME-4111 (120 s), including the analysis of ambient seismic noise, registering the signals of large remote earthquakes and weak local microearthquakes, and the instrumental approach of the site response assessment. The main characteristics of the broadband MET sensors and OBS architectures turned out to be suitable for obtaining high-quality OBS records under the Arctic conditions to solve seismological problems. In addition, the obtained case study results showed the prospects in a broader context, such as the possible influence of the seismotectonic factor on the bottom-up thawing of subsea permafrost and massive methane release, probably from decaying hydrates and deep geological sources. The described OBS will be actively used in further Arctic expeditions.

Gulf of Mexico's First Application of Riserless Mud Recovery for Top-hole Drilling - A Case Study

2010 ◽  
Author(s):  
John Hall Cohen ◽  
Jermund Kleppe ◽  
Tore Grønås ◽  
Thomas Baxter Martin ◽  
Torstein Tveit ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Hole Drilling

Advances in Deepwater Pipeline Route Selection - A Gulf of Mexico Case Study

2004 ◽  
Author(s):  
N.P. Tootill ◽  
M.P. Vandenbossche ◽  
M.L. Morrison
Keyword(s):  
Gulf Of Mexico ◽  
Route Selection ◽  
Pipeline Route
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