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PGS First Break Article on eSeismic Field Trial

Source: www.gulfoilandgas.com 11/14/2018, Location: Europe

The November issue of First Break features an article on our new acquisition and processing solution eSeismic. The article 'Latest field trial confirms potential of new seismic method based on continuous source and receiver wavefields' documents the benefits of the method including potential environmental advantages compared to traditional acquisition.

eSeismic treats the wavefields on both the source and the receiver side as continuous and requires seismic data to be recorded continuously and the source signals to be emitted uninterrupted while moving. To generate such an ideal source wavefield using existing equipment, individual airguns are triggered with short randomized time intervals in a near-continuous fashion.

One of the main potential benefits with the proposed method is the reduced environmental impact of marine seismic sources. The peak sound pressure levels are significantly reduced by triggering one airgun at a time compared to triggering many airguns in an array simultaneously as in conventional marine seismic sources. Sound exposure levels are also reduced.

The field trial was conducted in Brazil in May/June 2018 and demonstrated that the peak sound pressure levels are approximately 20-22 dB lower for the proposed method compared with conventional methods. Also, the sound exposure levels are 8-9 dB lower for eSeismic data. Dense cross-line CMP spacing is achieved without compromising the acquisition efficiency. The 800 m wide sail line is sampled with 96 common mid-points compared to 32 with a standard dual-source configuration. From an efficiency standpoint, there are minimal vessel speed limitations since this method does not require the seismic recording or the sources to be triggered at specific spatial intervals. Limitations imposed by shot cycle time and record length are now relaxed.

Data examples such as the one below show that high-resolution seismic images can be produced from seismic data acquired and processed using eSeismic.

Seismic survey News in Norway >>

Turkey >>  3/19/2019 - Shearwater GeoServices has announced the award of a seismic. The survey contract covers an area of 2200 sq km and includes fast track processing, foll...
South Africa >>  3/15/2019 - This PGS regional-scale 2D GeoStreamer seismic survey will stretch 11 000 km, from the Namibian border to Cape Agulhas, covering large, untested areas...

South Africa >>  3/14/2019 - Africa Energy Corp., an oil and gas company with exploration assets offshore South Africa and Namibia, is pleased to announce the start of a new 3D ma...
Brazil >>  3/11/2019 - SeaBird Exploration has announced a license sale of seismic data over Rio Grande Rise in Brazil. SeaBird's share of the sale is approx. $0.8 million. ...

Gabon >>  3/8/2019 - PGS MegaSurvey data and regional interpretation cover most of the 35 blocks on offer for the 12th Gabon Offshore Oil & Gas Exploration Licensing Round...
United States >>  3/7/2019 - TGS has announced a new multi-client onshore 3D seismic project, South Hackberry 3D, located on the east flank of the Anadarko Basin in Garfield, King...

Related Categories: Formation Evaluation  General  Geological, Geophysical  Geophysical Contractors  Mud Logging  Reservoir Engineering & Recovery Methods  Seismic survey  Well Completion, Logging, Workover 

Related Articles: Formation Evaluation  General  Geological, Geophysical  Geophysical Contractors  Mud Logging  Reservoir Engineering & Recovery Methods  Seismic survey  Well Completion, Logging, Workover 


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