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Abstract

Summary

Due to the existence of low-velocity anomaly zones such as shallow gas clouds, gas chimney,mud band, the amplitude and frequency will decrease seriously when seismic wave propagating through these area, which affect the accuracy of subsurface structure imaging. Q-PSDM is an effective technique to compensate the phase, frequency and amplitude losses caused by gas absorption. In this paper, we mainly focused on Q tomography and Q-PSDM application to Myanmar Rakhine basin, where low-velocity anomalies are developed in shallow layer, which is a challenge for seismic data processing. Firstly,based on relative accurate PSDM velocity model, the equivalent Q field is established in time domain; secondly, based on the equivalent Q field, Q tomography is carried on in depth domain to establish Q field model accurately; finally, kirchhoff Q PSDM is carried out based on high precision Q field. One case example in the deep-sea exploration area in Rakhine, Myanmar is demonstrated which can reconstruct the Q model effectively. The weak energy phenomennon caused by shallow low-speed anomaly absorption is solved, and the imaging quality of the weak energy area has been improved significantly.

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/content/papers/10.3997/2214-4609.201801127
2018-06-11
2024-04-20

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Q Tomography and Q-PSDM in Marine Data with Low-velocity Anomaly: A Case Study in Rakhine, Myanmar
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201801127
/content/papers/10.3997/2214-4609.201801127
/content/papers/10.3997/2214-4609.201801127
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