The Nature and Significance of Shortcut Seismic Reflection in#br#
the LS Area in Qiongdongnan Basin

doi:10.11885/j.issn.1674-5086.2014.09.18.08

Abstract

Abstract:

The prestack seismic in COSCO offset gathers low frequency（frequency of 25 Hz），near offset gathers on the performance
of high frequency（frequency reached 45 Hz），and the high-frequency signal attenuates rapidly along offset direction.
We made analysis of prestack speed spectrumand of shortcut；we also carried out forward modeling of drilling data and did a
comparative analysis. The results exclude the possibility of multiple waves of strong near-offset-frequency energy reflection.
As the thin interbedded reservoir distribution in the target area is under the influence of tuning effects，AVO analysis cannot
accurately detect hydrocarbon reservoir. After identifying combinations of reservoir characteristics by forward modeling，we
eliminated the reflective effect of short cut thin bed，and then made AVO analysis of the target area，and finally achieved well
seismic match，which also verified frequency dependent AVO technique is applicable in the region. Besides，we significantly
improved the main frequency of the data after dominant channel stacking，thus improved the accuracy of reservoir prediction
in the horizontal and vertical directions. The results proves the applicability of AVO analysis technology in the target area.

Key words: shortcut reflection, multiple wave, forward modeling, frequency dependent AVO, dominant channel stacking

CLC Number:

TE122
P631

YING Mingxiong*, CHEN Dianyuan, LIU Jianying, LIU Shiyou, CHEN Zuyin. The Nature and Significance of Shortcut Seismic Reflection in#br# the LS Area in Qiongdongnan Basin[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.09.18.08.

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The Nature and Significance of Shortcut Seismic Reflection in#br# the LS Area in Qiongdongnan Basin

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