Seismic vessel

Seismic Research Vessel

Seismic vessels are ships that are solely used for the purpose of seismic survey in the high seas and oceans. A seismic vessel is used as a survey vessel for the purpose of pinpointing and locating the best possible area for oil drilling in the middle of the oceans. Another major reason such seismic vessels are so important is that if oil drillers do not get the best subsea location to drill the oil and gas, then it could lead to dangerous and threatening consequences for the marine eco-system.

The usage of the seismologic vessels prevents such inadvertent mistakes. As the name suggests, seismic surveys use surface-induced seismic pulses to image subsurface formations.

Basically, a seismic wave is generated underneath the earth's surface, and then picked up by sensors called "geophones" as the waves bounce off subsurface formations -- that is, layers of rock beneath the surface. This process becomes more complicated when there are hundreds or thousands of feet of water between the earth's surface and the geophones. The returning pulses are picked up by an array of geophones attached to lines towed by the ship.

These arrays are called "streamers," and consist of long net-like bands with geophones spaced evenly along the streamer. In addition to being vessels that survey underwater seismology, seismic vessels are also used to study the geology of the oceans and seas.

Seismic Vessels News

This aspect includes the formation of rocks, oceanic trenches and many other details that are important and could affect the lives of humans and marine creatures alike. Offshore Fleet. The information gathered by the geophones is collected into an analog signal, before being converted to a digital signal and relayed to computers on the ship. The computers translate the information into digital maps of the subsurface, which geophysicists and geologists can analyze to determine the presence of hydrocarbons, which can save oil companies the gamble of sinking an unprofitable well.

While seismic may be expensive, it ultimately pays off, because it allows companies to hedge their bets, minimizing their potential loss and maximizing their potential gains.

Used sources: Marineinsight, RigZone.This website uses cookies to improve your user experience. By continuing to use this site, you consent to our Cookies Policy.

Please read our Privacy Statement for more information. There are several reasons why PGS seismic vessels are the safest, most reliable and most efficient in the industry.

The combination of the Ramform design and GeoStreamer is the main one. Our active fleet remains the youngest in the seismic industry and consists of eight 3D vessels six in the low season.

These resources can be reactivated when required. Each generation of the design has expanded on those benefits, culminating in the Titan-class: the ultimate seismic acquisition platform. GeoStreamer technology significantly improves data quality.

seismic vessel

All our vessels are equipped with this multisensor, broadband technology. This Titan-class ship has the flexibility to encompass virtually any acquisition design. Safety, quality, and productivity are the best in the industry. For clients that can mean completing an exploration program safely in one season, where other vessels might need two. The 70m back deck houses the industry's largest seismic spread and stern-launched workboats.

The Ramform Sovereign, launched inhas delivered some of the world's most efficient, high-capacity, seismic projects. She employs multisensor, broadband GeoStreamer acquisition technology. This highly efficient seismic vessel is designed for safe, efficient and reliable operations.

Sanco Swift was launched in and came on charter in This is an efficient and flexible ship offers an up-to-date platform for a broad range of seismic operations. This V-class Ramform was designed and built for high-density advanced seismic operations and has delivered excellent and reliable results in all regions of the world. Powerful engines enable this vessel to reach high transit speeds, significantly shortening the time spent between projects.

Ramform Viking belongs to the 20 reel V-class, designed and built for advanced seismic operations.

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Launched inthis vessel has delivered excellent and reliable results in all regions of the world. This was the first of the 20 streamer V-class ships. She delivered high performance from her first European season, before repeating the performance and reliability offshore West Africa. The Ramform Explorer, launchedwas the first seismic vessel to tow eight streamers, and then the first to tow 12 streamers, the first vessel to acquire over sq km in a month consistentlyand the first ever vessel to acquire over sq.Seismic vessels are specialized ships which are used to carry out seismic surveys at sea.

Working on Seismic Vessels: A General Overview of Ship’s Crew

They use survey-induced seismic pulses to image subsurface formation. To be a part of the seismic team, a person should have a strong technical background in electronics, computers and, of course, seismic tools, apart from the basic qualifications and experience required.

He oversees the overall seismic operation and plans the operation in consultation with the Master. They monitors the survey operation closely, check the quality of data collected and approve the acquisitions to be retained and send ashore for further processing.

Observers — generally are technicians with good electrical and electronic knowledge. The do maintenance and troubleshooting of problems related to streamer cables, geo phones etc.

seismic vessel

They keep watch on the data being received from the geophones and also do the preliminary quality check. They also point out the error in real time and co-ordinate with processors to improve the quality and quantity of data acquired. These people also record the the data, which includes the co —ordinates and time of each firing point, estimate the firing time and keep watch on cable depth, and adjust birds accordingly.

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Navigators closely work with the bridge, plans on the route to be followed and advices on maneuvering the vessel. The navigators and observers also work together in deploying cables and sorting out problems on streamer cables, hydrophones, birds, acoustic etc. Sometimes during seismic operation, the total people on board can reach up to 50 to 60 and the saloon department therefore has an important role to play, not just for preparing food but also for maintaining high standard of hygiene and proper housekeeping.

In engine room, during acquisition, apart from regular watch keeping duties in the engine control roomthe engineers also have to watch and maintain seismic compressors, the hydraulic power packs and other seismic related machinery systems. Although the people who work on board are well trained and experienced, care must be taken to avoid accidents, taking in to account the total number of person, working schedule and fatigue.

Before the vessel sets it sails, all crew including the seismic crew should be familiar with every safety aspect of the ship and this should be recorded. As a vessel restricted in her ability to maneuver RAMon deep sea seismic operation, navigation of Seismic vessel becomes easier. Utmost care is also taken while making a seismic vessel turn, which is always larger as sharp turns can damage the streamers and make them part off. With more than 40 people onboard seismic vessel, a number of high-tech machineries and operations close to shore, these vessels are vulnerable to extreme marine pollution.

A high standard of pollution prevention policy is therefore maintained by the companies to avoid spill and other damage to maritime environment. The views and opinions of the authors expressed herein do not state or reflect those of the Marine Insight.

Marine Insight has made every attempt to ensure the accuracy and reliability of the information provided in this article.

Chinese Seismic Vessel Returns to Waters off Vietnam Amid Virus 'Distraction' Charges

However, we do not accept any responsibility or liability for the accuracy, content, completeness, legality, or reliability of the information contained in this article. Dilipan Thomas is an aspiring seafarer, who has sailed on both cargo and offshore vessels. He has a good knowledge of the deck department, and is presently preparing and training himself to be a deck officer.

He loves working in challenging environments and prefers writing about his sailing experiences during his free time. Gud day sir any vacant for ab exp in ahts dsv osv and psv, 6yrs from offshore.

Thaks and god bless. Towing and anchor handling operation carried out in Mediterranean seaEgypt under Chevron charterer.

Total working on DP2 about hours. Looking for a long term employment to achieve my full DP license and Chief Officer promotion. Awaiting your replyhopefully you can help me to continue my career in offshore.

Thank you.A Chinese ship embroiled in a standoff with Vietnamese vessels last year has returned to waters near Vietnam as the United States accused China of pushing its presence in the South China Sea while other claimants are pre-occupied with the coronavirus. Vietnamese vessels last year spent months shadowing the Chinese Haiyang Dizhi 8 survey vessel in resource-rich waters that are a potential global flashpoint as the United States challenges China's sweeping maritime claims.

On Tuesday, the ship, which is used for offshore seismic surveys, appeared again km 98 miles off Vietnam's coast, within its exclusive economic zone EEZflanked by at least one China Coast Guard vessel, according to data from Marine Traffic, a website that tracks shipping. At least three Vietnamese vessels were moving with the Chinese ship, according to data issued by the Marine Traffic site.

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The presence of the Haiyang Dizhi 8 in Vietnam's EEZ comes towards the scheduled end of a day nationwide lockdown in Vietnam aimed at curbing the spread of the coronavirus. It also follows the sinking of a Vietnamese fishing boat near islands in the disputed waters this month, an act that drew a protest from Vietnam and accusations that China had violated its sovereignty and threatened the lives of its fishermen. The United States, which last month sent an aircraft carrier to the central Vietnamese port of Danang, said it was "seriously concerned" about China's reported sinking of the vessel.

State Department said in a statement, referring to China. The Philippines, which also has disputed claims in the South China Sea, has raised its concerns too. On Saturday, China's Global Times, published by the official People's Daily newspaper of China's ruling Communist Party, said Vietnam had used the fishing boat incident to distract from its "ineptitude" in handling the coronavirus.

Vietnam's Ministry of Foreign Affairs did not immediately respond to a request from Reuters for comment. Helped by a mass quarantine and aggressive contact-tracing, Vietnam has recorded cases of the novel coronavirus and no deaths. Nearlycoronavirus tests have been carried out in Vietnam. China and Vietnam have for years been at loggerheads over the potentially energy-rich waters, called the East Sea by Vietnam.

China's U-shaped "nine-dash line" on its maps marks a vast expanse of the waters that it claims, including large parts of Vietnam's continental shelf where it has awarded oil concessions.

seismic vessel

Malaysia and Brunei claim some of the waters that China claims to the south. During the standoff last year, at least one China Coast Guard vessel spent weeks in waters close to an oil rig in a Vietnamese oil block, operated by Russia's Rosneft, while the Haihyang Dizhi 8 conducted suspected oil exploration surveys in large expanses of Vietnam's EEZ. US-based offshore vessel provider Hornbeck Offshore has struck a comprehensive balance sheet restructuring support agreement with its lenders.

The announcement on Tuesday follows. Maritime Apps. Hornbeck Offshore Strikes Restructuring Deal with Lenders US-based offshore vessel provider Hornbeck Offshore has struck a comprehensive balance sheet restructuring support agreement with its lenders.

Gulf of Mexico emit far more methane than. Singapore Readies 'Floating Hotels' for Workers as Coronavirus Spreads Singapore is preparing to house hundreds of foreign workers in accommodation vessels typically.A seismic source is a device that generates controlled seismic energy used to perform both reflection and refraction seismic surveys. A seismic source can be simple, such as dynamiteor it can use more sophisticated technology, such as a specialized air gun. Seismic sources can provide single pulses or continuous sweeps of energy, generating seismic waveswhich travel through a medium such as water or layers of rocks.

What are Seismic Vessels?

Some of the waves then reflect and refract and are recorded by receivers, such as geophones or hydrophones. Seismic sources may be used to investigate shallow subsoil structure, for engineering site characterization, or to study deeper structures, either in the search for petroleum and mineral deposits, or to map subsurface faults or for other scientific investigations.

The returning signals from the sources are detected by seismic sensors geophones or hydrophones in known locations relative to the position of the source. The recorded signals are then subjected to specialist processing and interpretation to yield comprehensible information about the subsurface. The most basic seismic source is a sledge hammereither striking the ground directly, or more commonly striking a metal plate on the ground, known as hammer and plate.

Useful for seismic refraction surveys down to about 20 m below surface. Explosives most widely used as seismic sources are known as gelatin dynamite s. Upon detonation, explosives release large volumes of expanding gas very quickly, [5] forcing great pressure to the surroundings in the form of seismic waves.

Using explosives as seismic sources has been in practice for decades because of the reliability and energy efficiency they provide. Though dynamites and other explosives are efficient seismic sources because of their reduced costs, ease of transport in difficult terrains, and lack of regular maintenance compared to other sources, [8] the use of explosives is becoming restricted in certain areas, causing decline and increasing popularity for alternative seismic sources.

For instance, hexanitrostilbene was the main explosive fill in the thumper mortar round canisters used as part of the Apollo Lunar Active Seismic Experiments. This type of seismic drilling is often referred to as "Shot Hole Drilling". These drill rigs often use water or air to assist the drilling. An air gun is used for marine reflection and refraction surveys. Air guns are submerged below the water surface, and towed behind a ship.

When an air gun is fired, a solenoid is triggered, which releases air into a fire chamber which in turn causes a piston to move, thereby allowing the air to escape the main chamber and producing a pulse of acoustic energy. Air guns are made from the highest grades of corrosion resistant stainless steel. Large chambers i. A plasma sound source PSSotherwise called a spark gap sound sourceor simply a sparkeris a means of making a very low frequency sonar pulse underwater.

For each firing, electric charge is stored in a large high-voltage bank of capacitorsand then released in an arc across electrodes in the water. The underwater spark discharge produces a high-pressure plasma and vapor bubble, which expands and collapsesmaking a loud sound. There are also plans to use PSS as a non-lethal weapon against submerged divers [ citation needed ].

Inthe weight dropping thumper technique was introduced as an alternative to dynamite sources. A thumper truck or weight-drop truck is a vehicle-mounted ground impact system which can be used to provide a seismic source. A heavy weight is raised by a hoist at the back of the truck and dropped, generally about three meters, to impact or "thump" the ground.

Several thumps are stacked to enhance signal to noise ratio. AWD allows both more energy and more control of the source than gravitational weight-drop, providing better depth penetration, control of signal frequency content.

Thumping may be less damaging to the environment than firing explosives in shot-holes, [13] [ citation needed ] though a heavily thumped seismic line with transverse ridges every few meters might create long-lasting disturbance of the soil.

An advantage of the thumper later shared with Vibroseisespecially in politically unstable areas, is that no explosives are required.

A seismic vibrator propagates energy signals into the Earth over an extended period of time as opposed to the near instantaneous energy provided by impulsive sources. The data recorded in this way must be correlated to convert the extended source signal into an impulse.

The source signal using this method was originally generated by a servo-controlled hydraulic vibrator or shaker unit mounted on a mobile base unit, but electro-mechanical versions have also been developed.

The "Vibroseis" exploration technique was developed by the Continental Oil Company Conoco during the s and was a trademark until the company's patent lapsed.Norwegian offshore seismic surveyor PGS has said that the coronavirus pandemic and the disruption in the oil market present unprecedented challenges for the offshore services industry, including the marine seismic industry.

PGS expects the low oil price will have a material adverse impact on demand for seismic services and activity levels. Brent crude futures fell 3. While oil companies have recently canceled several seismic survey contracts…. The vessel is environmentally advanced with diesel-electric propulsion, high specification catalytic converters, a double hull and advanced bilge water cleaning system.

The 4D…. The provider of marine 2D and 3D seismic data and associated products and services to the oil and gas industry, SeaBird Exploration announced a contract award by Wintershall Dea for 2D acquisition in the Norwegian Sea. The survey has an expected duration of one month and start in the third quarter this year, the Norwegian seismic player said in a press release. Meanwhile, SeaBird has made further progress towards the completion of the acquisition of the Boa Galatea and Boa Thalassa vessels.

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The redelivery of the vessel from British Antarctic Survey BAS marked the end of a nearly year relationship between British Antarctic Survey and GC Rieber Shipping, said a press release from the operator of offshore subsea support vessels,…. In order to finance the acquisition of the BOA Vessels….

The vessels are the 9,bhp Elektron built and 1,bhp Elektron II builtsaid a stock exchange announcement from the company that operates offshore subsea support vessels, marine seismic vessels and polar logistics and research expeditions. The transaction, which remains subject to regulatory approvals and other customary closing conditions, is expected to close in the fourth quarter of According to Marlink, the upgrade gives Sealink C-band VSAT users more flexibility to add alternative VSAT frequencies to their network in order to ensure availability of high-speed critical business and operational applications globally.

Shares of the world's leading provider of geoscience data to oil companies TGS fell by more than 6 percent on Thursday, after disappointing sales in the second quarter. PGS's seismic vessels are used for mapping and analysing the subsurface beneath the ocean floor for oil and gas exploration around the world. Approximately 20, sq. The project will commence early in Q2 The remaining 10, sq.

Norwegian marine geophysical company PGS has extended its non-exclusive service agreement with Radio Holland for navigation and communication services onboard nine seismic vessels in its global fleet. Radio Holland is known in the maritime industry for its NavCom and Maintenance services through its global network of more than 80 offices.The significant financial perils of drilling an unsuccessful well on dry land are only magnified when the unprofitable well is drilled in several thousand feet of water.

Rig costs alone can top half a million dollars per day, with companies standing to lose a fortune should their expensive investments come up empty-handed. Fortunately, seismic surveys can save companies hundreds of millions of dollars by giving them precise information about subsurface features and even the presence of oil. In essence, seismic surveys are a way to probe beneath the surface to "see" underlying features that make up the underground structure of a prospect.

Such features can give companies a more astute indication if a prospect contains hydrocarbons. As the name suggests, seismic surveys use surface-induced seismic pulses to image subsurface formations.

Basically, a seismic wave is generated underneath the earth's surface, and then picked up by sensors called "geophones" as the waves bounce off subsurface formations -- that is, layers of rock beneath the surface. This process becomes more complicated when there are hundreds or thousands of feet of water between the earth's surface and the geophones. In land seismicthe methods for generating seismic waves in the substrate are rather simple.

Dynamite and a process called vibroseis high-frequency replication are the most practical and common. However, dynamite use has been discontinued in marine seismic, because of the danger of harming marine life, low repetition rates and the expense of employing two ships necessary for the process.

Instead, marine seismic vessels use a combination of air guns, water guns and other acoustic sources to create the pulse needed to take seismic readings. The water gun or a combination array consisting of several sources is preferable to the air gun, because the air gun generates an unwanted secondary pulse after initially being fired, which obscures the waveform that can disturb the proper interpretation of the data. The water gun injects water into the surrounding water, resolving the problem caused by compressed air.

The point is to produce an acoustic vibration that can be read by the geophones and interpreted to reveal the geologic features underneath the seafloor. There are other methods as well, including a source that produces a chirp, or "swept" frequency.

This method uses a series of frequencies based on "chirp radar" to supply the reflected pulse. The various sources emit a variety of frequencies in order to give a more accurate read of the subsurface terrain.

Whatever the acoustic source, the goal is to produce seismic pulses that reflect off of the boundaries between various layers of rock, all of which will cause the sound wave to react differently. It is important that the pulse be emitted in rhythmic repetition as the vessel moves to create a detailed length of mapping. Regardless of which method is used, the returning pulses are picked up by an array of geophones attached to lines towed by the ship.

These arrays are called "streamers," and consist of long net-like bands with geophones spaced evenly along the streamer. The information gathered by the geophones is collected into an analog signal, before being converted to a digital signal and relayed to computers on the ship.

The computers translate the information into digital maps of the subsurface, which geophysicists and geologists can analyze to determine the presence of hydrocarbons, which can save oil companies the gamble of sinking an unprofitable well. While seismic may be expensive, it ultimately pays off, because it allows companies to hedge their bets, minimizing their potential loss and maximizing their potential gains.

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What is Seismic? Source: Open Learn. Source: Schlumberger. How Does Formation Testing Work? How Does Artificial Lift Work? More How it Works Articles. NACE International With programs developed, peer reviewed, and taught by industry experts, NACE provides corrosion control training and certification to help students launch a career, broaden their expertise, and provide greater industry recognition and credibility.

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