Effective techniques for seismic description of reservoirs in Jiyang Depression, Bohai Bay Basin

Abstract

A series of 3D seismic descriptions for five reservoir types in the Jiyang Depression of Bohai Bay Basin was proposed based on the comparison and analysis of a large amount of drilling and seismic data. The effective techniques for seismic description of channel sandstone reservoirs include amplitude preserving and frequency extension processing based on high-precision isochronous stratigraphic framework, fusion of pre-stack and post-stack sensitive attributes, and comprehensive identification of oil and gas potential. Logging constrained sequence subdivision, sedimentary microfacies and lithofacies identifications by stochastic simulation and probability body subdivision of impedance lithofacies, and phase constrained multi-parameter prediction of effective reservoir can be effectively applied to seismic description of a conglomeritic fan reservoir. On the basis of improving processing resolution, multi-attribute fusion technology can effectively predict the effective beach bar sandstone reservoirs. The techniques such as "sweet spot" attribute analysis, seismic waveform indication inversion, pre-stack elastic parameter inversion, lithology probability inversion can effectively describe turbidite sandstone reservoirs. Fault enhancement processing, multi-attribute body joint identification of faults, optimization of fault plane combination and spatial three-dimensional interpretation can precisely describe complex fault block reservoirs. The technical effectiveness varies with the accuracy and quality of seismic data and the changes of geological conditions.

Keywords

• channel sand
• glutenite
• turbidite
• beach bar sand
• complex fault block
• seismic description
• jiyang depression
• bohai bay basin