The Fine Description of Interbedded Sand-Shale Reservoirs in Shallow Water Delta : A Case Study of P19 Oilfield in Bohai Bay Basin, China

Most sands in Layer L70-L90 of P19 Oilfield are thin sands within interbedded sand and shale sets, which are below the seismic resolution of 17 m and could not be identified by seismic data. To improve development effects, the hierarchical method for fine description of thin sands within interbedded sand and shale sets deposited under shallow water delta was conducted through the integration of seismic attributes analysis, geological knowledge repository analog and constraint by depositional sequence. The successful application suggested that this technique not only has high prediction accuracy and application value, but also added new information to geological knowledge repositories of single sand in different depositional sequences and provided references for research and development of thin sand reservoir in similar oilfields in Bohai Bay.