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Compensation of Shallow Gas Cloud Attenuation by Q Tomography - A Bohai Bay Case StudyNormal access

Authors: L.X. Tian, T.X. Xia, D.H. Zhou and Y.Y. Wang
Event name: 77th EAGE Conference and Exhibition 2015
Session: Seismic Imaging - Case Histories I
Publication date: 01 June 2015
DOI: 10.3997/2214-4609.201412774
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 6.33Mb )
Price: € 20

Summary:
The shallow gas cloud’s presence will bring severe travel time distortion and energy absorption to seismic data. For compensating the amplitude and frequency attenuation, Q tomography is the proposed approach. And Bohai Bay is known as its large gas cloud size and complex faults system. It has been a difficulty to recover the energy and image below gas zone for decades in this area. In this paper, we illustrated the application of Q compensation in Bohai Bay for the first time. With careful parameterization of serial pre-processing such as multiple attenuation, depth velocity building and Q field tomography. Final results show that vague zone caused by gas cloud has been reduced obviously. We demonstrated that Q tomography is an effective solution for gas cloud problem in Bohai Bay region.


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