APPLICATION OF PRESTACK DEPTH MIGRATION BASED ON FINE DATA PROCESSING TO THE SLOPE AREA OF LINGSHUI SAG, QIONGDONGNAN BASIN

LIU Jieming; LI Sanfu; SUN Bo; ZENG Weihui; SUN Leiming; WANG Xinling; XIA Dongming

doi:10.16028/j.1009-2722.2019.08008

2019 Vol. 35, No. 8

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Article navigation > Marine Geology Frontiers > 2019 > 35(8): 58-66

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LIU Jieming, LI Sanfu, SUN Bo, ZENG Weihui, SUN Leiming, WANG Xinling, XIA Dongming. APPLICATION OF PRESTACK DEPTH MIGRATION BASED ON FINE DATA PROCESSING TO THE SLOPE AREA OF LINGSHUI SAG, QIONGDONGNAN BASIN[J]. Marine Geology Frontiers, 2019, 35(8): 58-66. doi: 10.16028/j.1009-2722.2019.08008

Citation:

LIU Jieming, LI Sanfu, SUN Bo, ZENG Weihui, SUN Leiming, WANG Xinling, XIA Dongming. APPLICATION OF PRESTACK DEPTH MIGRATION BASED ON FINE DATA PROCESSING TO THE SLOPE AREA OF LINGSHUI SAG, QIONGDONGNAN BASIN[J]. Marine Geology Frontiers, 2019, 35(8): 58-66. doi: 10.16028/j.1009-2722.2019.08008

APPLICATION OF PRESTACK DEPTH MIGRATION BASED ON FINE DATA PROCESSING TO THE SLOPE AREA OF LINGSHUI SAG, QIONGDONGNAN BASIN

1.
Zhanjiang Branch of CNOOC Ltd., Guangdong 524057, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China

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Corresponding author: XIA Dongming, xdm@ouc.edu.cn

Received Date: 05 December 2018

Publish Date: 28 August 2019

Abstract

Abstract

The slope break of the Lingshui Sag in the southeastern Qiongnan Basin is characterized by complicated topographic and geomorphological features on seabed and structural deformations in middle and deep parts, that leads to the low precision of seismic velocity models in this area.The quality of images is seriously affected as the result. In order to build an accurate velocity model for the area, this paper for the first time used an integrated method, which includes multiple attenuation, broadband processing, pre-stack signal-to-noise ratio enhancement and other specific processing techniques, to obtain a broadband high signal-to-noise ratio pre-stack data set.The initial velocity model of pre-stack depth migration is then established on this basis by using velocity statistics and trend constrained modeling techniques.High-resolution grid tomographic inversion technique based on broadband data is used to establish the optimal high-precision velocity model. Finally high-precision prestack depth migration imaging is realized. The pre-stack depth migration profile based on the velocity model shows that the technology of pre-stack depth migration based on the fine velocity model can obviously improve the signal-to-noise ratio in the slope break area and the imaging quality, and effectively eliminate the formation coaxial distortion. The true structures of underground strata are reconstructed, which may provide more reliable seismic data for target evaluation and drilling decision-making.
- slope break area /
- broadband processing /
- grid tomography /
- pre-stack depth migration /
- Lingshui Sag of Qiongdongnan Basin

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References

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