New progress and key techniques of shallow lithologic reservoir exploration in Bohai Sea
With the petroleum exploration deepens,the shallow large-scale tectonic traps in the Bohai Sea have been discovered mostly,and the shift to lithologic exploration is imperative.However,shallow lithologic reservoir exploration faces issues and challenges in terms of large-scale sand distribution,hydrocarbon accumulation models,fine description of thin sand boundaries,and hydrocarbon detection.Based on the full-coverage 3D seismic data and experimental data,the shallow regional sedimentation patterns and hydrocarbon accumulation were investigated.The migration-type meandering river,stable-type meandering river,river-lake reciprocal sedimentation model,and large-scale sand distribution patterns were clarified.Four large-scale shallow lithologic hydrocarbon accumulation models were established in high-uplift,low-uplift,uplift area in depressions,and sag areas.Additionally,innovative techniques about well-seismic matching high-resolution wave impedance inversion for sand description and comprehensive hydrocarbon detection based on frequency variation A VO characteristics were developed.Based on the above achievements,major breakthroughs were obtained in shallow large-scale lithologic reservoir exploration in the Bohai Sea,and large-medium oilfields such as KL6-1,KL10-2,BZ19-2,and QHD27-3 were discovered.This study summarized exploration achievements of shallow lithologic reservoirs in the Bohai Sea systematically,to provide references for further exploration of large-scale lithologic reservoirs in terrestrial rift basins.
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