Research on mean velocity field modeling method for low velocity anomaly zone: A case study from Q oilfield, Bohai
Online published: 2015-05-26
As the bridge to connect seismic and geological, time-depth conversion is a hot topic of geophysical research. In recent years, with further exploration and exploitation of Bohai Oilfield, higher accuracy of time-depth conversion is required. The target zone of Q oilfield is the deposition of meandering river of Minghuazhen Formation, and it is characterized by typical low amplitude structure, large lateral variation of formation velocity and obvious low velocity anomaly. The above two features brought new challenges to the research of time-depth conversion method for this oilfield. Based on the flaw and insufficiency of conventional velocity modeling method, this paper proposed a new method that firstly determines the distribution range of low velocity anomaly by seismic data combined with logging and geological stratification, then creates seed points inside the anomaly range according to the degree of velocity anomaly, finally builds the velocity field by spatial interpolation under the restraint of velocity at seed points and well points. The velocity field can finally be used for time depth conversion. From actual drilling situation, this method can improve the prediction accuracy more greatly than conventional methods and has made a good practical application.
FU Guang , WU Wei . Research on mean velocity field modeling method for low velocity anomaly zone: A case study from Q oilfield, Bohai[J]. Lithologic Reservoirs, 2015 , 27(3) : 122 -126 . DOI: 10.3969/j.issn.1673-8926.2015.03.019
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