3D Seismic Imaging Technology and Its Application in GCD Work Area of Tarim Basin

doi:10.7657/XJPG20240414

Abstract

Abstract:

The GCD work area of the Tarim basin is covered by desert, where the acquired seismic data are superimposed with high-energy sand dune resonance noise due to the loose and thick dune structures, hampering the accurate imaging of the Ordovician marine reef-beach reservoir. Conventional imaging methods are disadvantageous due to low resolution, defocusing and other defects. On the basis of fidelity-based seismic processing, a three-step method for substantial attenuation of the sand dune resonance noise was incorporated. The 3D frequency space domain pre-stack random noise suppression technology was adopted to enhance the signal-to-noise ratio (SNR) of pre-stack preprocessing gathers. Furthermore, vertical seismic profile velocity, logging data, and interpreted horizons were combined to enable a multi-information-constrained grid tomography modeling and anisotropic reverse time migration. The results show that the sand dune resonance noise is effectively attenuated, and the SNR of pre-stack seismic data is significantly improved as compared to conventional denoising methods. The residual random seismic noise in pre-stack gathers is effectively suppressed, and the post-processing energy in velocity spectra of the gathers is more focused, facilitating precise velocity model establishment. Based on the high-density seismic imaging gathers, depth-domain model inversion where the inversion grid is gradually refined from coarse to fine was performed, and the established velocity model can accurately characterize the Ordovician marine reef-beach reservoirs. Anisotropic reverse time migration accurately relocated the complex wavefields of the Ordovician marine reef-beach reservoirs, enhancing resolution and focusing. The research results provide a support for optimizing the design of the sidetracking trajectory for Well G1 in the GCD work area, which was validated by actual drilling results. These techniques can provide a robust technical support for high-precision imaging and processing of seismic data in desert areas of the Tarim basin.

Key words: Tarim basin, seismic imaging, sand dune resonance noise, tomography modeling, anisotropy, reef-beach, reservoir

CLC Number:

P631.443

CHEN Keyang, ZHOU Hui, WANG Cheng, LIU Yang, LIU Jianying, WANG Yangyang, LIU Jishun. 3D Seismic Imaging Technology and Its Application in GCD Work Area of Tarim Basin[J]. Xinjiang Petroleum Geology, 2024, 45(4): 489-498.

Figures/Tables 11

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