Ultra-deep oil and gas reservoir seismic prospecting technologies progress
The ultra-deep oil and gas reservoir gradually becomes an important growth point of explored re-serves and production nationwide and worldwide,and the research and application of ultra-deep oil and gas reservoir seismic prospecting technology are of great significance.To this end,with the ultra-deep oil and gas reservoir in Tarim as the research target,the difficulties faced by the seismic and geological conditions and seismic prospecting of ultra-deep oil and gas reservoirs are analyzed.The formation,development,and applica-tion results and effects of the third-generation seismic prospecting technology for ultra-deep oil and gas reservoir are summarized,and the development strategy of this technology is prospected.The research suggests that the first generation of ultra-deep oil and gas reservoir seismic prospecting technology mainly based on wide-line and 3D geometry,high-velocity layer excitation,and pre-stack time migration has settled the low signal-to-noise ra-tio in ultra-deep seismic data.The second generation of ultra-deep oil and gas reservoir seismic technology mainly based on 3D,wide azimuth,higher-density geometry,and prestack depth migration has preliminarily re-solved the inaccurate location of ultra-deep seismic data imaging.The third generation of ultra-deep reservoir seismic technology is mainly based on high-density and wide-azimuth 3D geometry,enhanced energy and noise reduction for seismic excitation,deep layer spectrum spread and fidelity,true surface TTI depth migration imaging,segmented fault interpretation and combination,OVT domain phase-controlled inversion and interpretation,etc.This techno-logy has basically overcome the high-precision imaging problem of ultra-deep seismic data and effectively supports the discovery and exploration of the Fuman ultra-deep ten-billion-ton oilfield and the Bozi-Dabei ultra-deep trillion-cubic-meter gas field.The energy enhancement and noise reduction,the spectrum spread and fidelity,the focus location,and the decoupling mapping will be prioritized in the future development of ultra-deep oil and gas reservoir seismic prospecting technology.
ultra-deep oil and gas reservoirseismic prospecting technologyenergy enhancement and noise re-ductionspectrum spread and fidelityfocus locationdecoupling mapping
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