Super-sparse marine 3D: A game changer for seismic exploration

2022 ◽  
Vol 41 (1) ◽  
pp. 19-26
Author(s):  
Patrick Charron ◽  
Erwan L'Arvor ◽  
Jens Fasterling ◽  
Guillaume Richard
Keyword(s):  
Seismic Data ◽  
Seismic Exploration ◽  
Complete Coverage ◽  
Fast Acquisition ◽  
Environment Exposure ◽  
Seismic Acquisition ◽  
Marine Seismic ◽  
Safety And Environment ◽  
Processing Steps ◽  
Game Changer

TotalEnergies SE and partners Shell and PetroSA recently completed the acquisition and processing of a large (10,000 km2) ultra-sparse (200 m between streamers) marine seismic acquisition survey off the west coast of South Africa in block 5/6/7 using a large PGS Titan Class Ramform vessel. The sparse design enabled fast acquisition and low survey cost and health, safety, and environment exposure. Advances in sparse processing enabled high-quality final seismic data consistent with the exploration objectives. In addition, DUG optimized the 4D regularization/interpolation parameters to approach the near offsets differently than the offsets with more complete coverage to help several processing steps. The survey was designed to be upgradable to a higher-resolution survey if needed via the addition of a custom regular infill pattern, either in its entirety or over targeted areas.

Study of Onega lake Petrozavodsk bay sub-bottom sediments using complex geophysical and geological data analysis

2019 ◽  
pp. 98-104
Author(s):  
M. I. Aleshin ◽  
V. G. Gaynanov ◽  
M. Yu. Tokarev ◽  
A. E. Rybalko ◽  
D. A. Subetto
Keyword(s):  
Seismic Data ◽  
Quaternary Sediments ◽  
Geological Interpretation ◽  
Onega Lake ◽  
Engineering Data ◽  
Seismic Acquisition ◽  
Data Survey ◽  
Survey Results ◽  
Marine Engineering ◽  
Marine Seismic

This article examines the results of geological interpretation of marine engineering data acquired in Onega lake. The survey included marine seismic acquisition and geological sampling. Seismo-stratigrafic units were picked according to processed seismic data. Survey results allowed to make a seismo-stratigrafic column of quaternary sediments of Onega lake. The column could be used to analyze the structure of open part of the lake as well.

The Design of Multichannel Marine Seismic Acquisition Unit Based on ADS1282

2014 ◽  
Vol 989-994 ◽  
pp. 3274-3277
Author(s):  
Zhi Li Zhang ◽  
Ying Zhang ◽  
Peng Chen
Keyword(s):  
Data Acquisition ◽  
Seismic Data ◽  
Signal Acquisition ◽  
Data Sampling ◽  
Analog To Digital ◽  
Field Programmable ◽  
Seismic Acquisition ◽  
Seismic Data Acquisition ◽  
Marine Seismic ◽  
Data Acquisition Unit

For marine seismic data acquisition needs,a multichannel marine seismic data acquisition unit was designed,which used the 32-bit analog-to-digital ADS1282 as a core and Field programmable gate array (FPGA) as the acquisition controller.The unit can achieve multichannel seismic data sampling and transmission functions.The design fully used with the design ADS1282 chip integration,with the corresponding anti-jamming measures,not only simplified the circuit design,but also ensured the quality of signal acquisition and system stability.the design used FPGA to realize a multichannel hydrophone signal synchronization sampling.

Migration using sea surface-related multiples: Challenges and opportunities

Geophysics ◽  
2021 ◽  
pp. 1-42
Author(s):  
Shaoping Lu
Keyword(s):  
Data Acquisition ◽  
Least Squares ◽  
Seismic Data ◽  
Sea Surface ◽  
Seismic Exploration ◽  
Algorithm Development ◽  
Challenges And Opportunities ◽  
Seismic Data Acquisition ◽  
Marine Seismic

In marine seismic exploration, it has been well known that sea surface-related multiples can be treated as signals to image the subsurface and provide extended illumination. Previous studies on imaging of multiples have been mainly focusing on its algorithm development and implementation. This paper serves as a tutorial where we systematically investigate the fundamental challenges in the process of imaging of multiples. We first examine the impacts of marine seismic data acquisition parameters: such as offset, trace spacing and streamer towing direction, which are all key elements that control the quality of the images of multiples, and illustrate that 3D towed streamer and OBS surveys are preferable acquisition geometries to apply imaging of multiples. In addition, we investigate the challenges in jointly imaging primaries and multiples and the crosstalk problem in the process, and demonstrate that a Least-Squares inversion based algorithm is effective to address these issues. With the proper handling of all those challenges, imaging of multiples can help to mitigate shallow acquisition footprints, improve salt boundary illumination and enhance the imaging resolution, which allow the identification of drilling hazards and reduction in drilling risks. To apply imaging of multiples in practice, the objective is not to replace but to augment imaging of primaries by providing extra illumination.

scholarly journals Investigation of geophysical challenges in land seismic data acquisition in Nigeria: case study of parts of the Niger Delta region

2021 ◽  
Vol 11 (2) ◽  
pp. 587-599
Author(s):  
C. N. Onwubuariri ◽  
L. S. Al-Naimi ◽  
B. I. Ijeh ◽  
T. I. Mgbeojedo ◽  
M. U. Igboekwe ◽  
...  
Keyword(s):  
Seismic Data ◽  
Niger Delta ◽  
Weather Conditions ◽  
Seismic Exploration ◽  
Noise Interference ◽  
Niger Delta Region ◽  
Cloudy Weather ◽  
Seismic Acquisition ◽  
Seismic Data Acquisition

AbstractGeophysical analysis was carried out to evaluate the challenges encountered in land seismic exploration within the study area. This analysis cuts across various stages in land seismic acquisition. These stages include the following: the availability of the prospect map as originally planned by the prospect owners—the client, the desk study and planning of this map by the seismology section (planning seismologist) for acquisition convenience and the field implementation of the acquisition which the survey, drill and recording (preloading, shooting, swath move, line check, LAUX crew and recording platform) sections carried out. The challenges observed included environmental challenges, noise interference, weather conditions (statics or electrostatics interference), line break, faulty equipment, wrong detailing, cake or expired explosives, poor or compromised supervision, security and permit challenges. These challenges are peculiar to Nigeria due to inadequate implementation of policies that guide human settlements and activities. Nigeria is within the climate region where most at times it is very impossible to control natural events like cloudy weather, rainfall, thundering and lightening. As such, the problem of static charges interfering with acquired seismic data becomes inevitable, mostly during the rainy season. Almost total dependency on imported technology and lack of readily available experienced manpower also contribute to these challenges, most especially when it has to do with proper inspection of equipment and materials required for the acquisition and supervision processes. Approaches to follow to minimize the observed challenges were equally highlighted.

Marine seismic acquisition: efficiency and environment, new technologies applied in Australia

2017 ◽  
Vol 57 (2) ◽  
pp. 704 ◽  
Author(s):  
Martin Bayly ◽  
Michelle Tham ◽  
Peter Watterson ◽  
Binghui Li ◽  
Kevin Moran
Keyword(s):  
Environmental Impact ◽  
New Technologies ◽  
New Technology ◽  
Seismic Exploration ◽  
Exposure Level ◽  
North West ◽  
Optimal Output ◽  
Air Gun ◽  
Seismic Acquisition ◽  
Marine Seismic

The design of successful marine seismic surveys is driven by many factors, two prime issues being efficiency and environmental impact. Efficiency is primarily driven by reduction of non-productive time and creating the largest sub-surface illumination area possible in the shortest time. In addition, public opinion and governmental regulations are requiring the industry to minimise their environmental impact. One aspect is reducing the overall sound exposure level (SEL) of the source into the marine environment. Using recent Australian examples, we will discuss and demonstrate the use of two new technology groups that address these concerns. The first is the use of a new type of seismic air-gun with optimal output over the range of frequencies commonly used in seismic exploration, while limiting potential environmental effects from unnecessary high-frequency emissions. The second is continuous data acquisition along the entire boat traverse, including the turns, thereby reducing non-productive vessel time. Both are described with examples from a recent survey acquired offshore north-west Australia.

scholarly journals Flow and swell noise in marine seismic data

Geophysics ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. Q17-Q25 ◽  
Author(s):  
Thomas Elboth ◽  
Bjørn Anders Reif ◽  
Øyvind Andreassen
Keyword(s):  
Turbulent Flow ◽  
Seismic Data ◽  
Signal To Noise Ratio ◽  
Fluid Dynamic ◽  
Pressure Fluctuations ◽  
Weather Conditions ◽  
Flow Noise ◽  
Seismic Acquisition ◽  
Dynamic Perspective ◽  
Marine Seismic

Various weather-related mechanisms for noise generation during marine seismic acquisition were addressed from a fluid-dynamic perspective. This was done by analyzing a number of seismic lines recorded on modern streamers during nonoptimal weather conditions. In addition, we examined some of the complex fluid-mechanics processes associated with flow that surrounds seismic streamers. The main findings were that noise in the [Formula: see text] range is mostly the result of direct hydrostatic-pressure fluctuations on the streamer caused by wave motion. For normal swell noise above [Formula: see text] and for crossflow noise, a significant portion of the observed noise probably comes from dynamic fluctuations caused by the interaction between the streamer and fluid structures in its turbulent boundary layer. This explanation differs from most previous work, which has focused on streamer oscillations, bulge waves inside old fluid-filled seismic streamers, or strumming/tugging as the main source of weather-related noise. Although modern streamers are less sensitive to such sources of noise, their ability to tackle the influence on turbulent flow noise has not improved. This implies that noise induced by turbulent flow has increased its relative impact on modern equipment. To improve the signal-to-noise ratio on seismic data, design issues related to flow noise must be addressed.

scholarly journals PENERAPAN METODE F-K DEMULTIPLE DALAM KASUS ATENUASI WATER-BOTTOM MULTIPLE

2016 ◽  
Vol 11 (1) ◽  
pp. 33
Author(s):  
Subarsyah Subarsyah ◽  
Sahudin Sahudin
Keyword(s):  
Seismic Data ◽  
Final Section ◽  
Signal To Noise Ratio ◽  
Multiple Reflections ◽  
Seismic Section ◽  
Multiple Attenuation ◽  
Seismic Acquisition ◽  
Marine Seismic ◽  
Second Category ◽  
Water Bottom

Keberadaan water-bottom multiple merupakan hal yang tidak bisa dihindari dalam akuisisi data seismik laut, tentu saja hal ini akan menurunkan tingkat perbandingan sinyal dan noise. Beberapa metode atenuasi telah dikembangkan dalam menekan noise ini. Metode atenuasi multiple diklasifikasikan dalam tiga kelompok meliputi metode dekonvolusi yang mengidentifikasi multiple berdasarkan periodisitasnya, metode filtering yang memisahkan refleksi primer dan multiple dalam domain tertentu (F-K,Tau-P dan Radon domain) serta metode prediksi medan gelombang. Penerapan metode F-K demultiple yang masuk kategori kedua akan diterapkan terhadap data seismik PPPGL tahun 2010 di perairan Teluk Tomini. Atenuasi terhadap water-bottom multiple berhasil dilakukan akan tetapi pada beberapa bagian multiple masih terlihat dengan amplitude relatif lebih kecil. F-K demultiple tidak efektif dalam mereduksi multiple pada offset yang pendek dan multiple pada zona ini yang memberikan kontribusi terhadap keberadaan multiple pada penampang akhir. Kata kunci : F-K demultiple, multiple, atenuasi The presence of water-bottom multiple is unavoidable in marine seismic acquisition, of course, this will reduce signal to noise ratio. Several attenuation methods have been developed to suppress this noise. Multiple attenuation methods are classified into three groups first deconvolution method based on periodicity, second filtering method that separates the primary and multiple reflections in certain domains (FK, Tau-P and the Radon domain) ang the third method based on wavefield prediction. Application of F-K demultiple incoming second category will be applied to the seismic data in 2010 PPPGL at Tomini Gulf waters. Attenuation of the water-bottom multiple successful in reduce multiple but in some parts of seismic section multiple still visible with relatively smaller amplitude. FK demultiple not effective in reducing multiple at near offset and multiple in this zone contribute to the existence of multiple in final section. Key words : F-K demultiple, multiple, attenuation

Full-azimuth, full-offset, high-fidelity vector marine seismic acquisition

2020 ◽  
Vol 39 (4) ◽  
pp. 238-247
Author(s):  
Michel Manin ◽  
Luc Haumonté ◽  
Eric Bathellier
Keyword(s):  
Data Analysis ◽  
Seismic Data ◽  
Technology Development ◽  
High Fidelity ◽  
Successful Performance ◽  
High Quality ◽  
Pilot Survey ◽  
Autonomous Surface Vehicles ◽  
Seismic Acquisition ◽  
Marine Seismic

Ten years ago, Kietta launched a project to develop a new method of marine seismic acquisition using midwater stationary cables and autonomous surface vehicles. We present the concept and the technology bricks and recount the successful performance of a commercial pilot survey. The objective of the technology is to enable flexible acquisitions and deliver high-quality, high-fidelity seismic data without sacrificing productivity. After reviewing existing marine seismic acquisition methods, we describe the technology development, including sea trials. The geophysical advantages of acquiring true 3D/four-component data are demonstrated by seismic data analysis, including simultaneous sources and associated productivity calculation.

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