Seismic Response of Reservoir Discontinuity and Architecture of Compound Sandbody——A Case Study of Ⅳ-2 Layer in P Oilfield of Bohai Bay
Study on reservoir discontinuity detects changes in multi-seismic attributes and an-alyse reservoir architecture through combination of seismic and well data.Considering that present reservoir discontinuity studies mainly focus on single-period sandbody,this study proposes a method to characterize the architecture of reservoir consisted of two-period sand-body and illustrate the process with the case study of Ⅳ-2 Layer in P oilfield of Bohai Bay.The method can be summarized as"deciding architecture type by well data,boundary posi-tion by discontinuity prediction,structure by waveform".Firstly,four architecture types of two-period sandbody are classified based on well logging identification and classification of single well configuration.Then,the forward models of the four architecture types are con-structed and a standard for sand structure decision is concluded using boundary types and skewness as two indicators.The method is used for the architecture anatomy of the study ar-ea,showing the Ⅳ-2 layer can be further divided into three period of channel belt deposi-tion,whose width is 150～380 m,the lapping boundary and abandoned channel forms the flow-resisting discontinuity boundaries.The result is verified by dynamic interaction between wells,demonstrating the feasibility of this method to improve the accuracy of reservoir archi-tecture analysis.
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