Prediction of small scale fracture-cavity reservoir based on prestack frequency division
The characterization of small-scale fracture-cavity in carbonate rocks in Tahe Oilfield is an urgent need to realize efficient and fine development of fractured reservoirs.Due to the difficulty of fine characterization,the prediction accuracy in the early stage is difficult to meet the production requirements.Therefore,this paper takes the Sangtamu area as the research area,and carries out the research on the fine description method of fracture-cavity based on the prestack frequency division migration.Firstly,combined with the drilling and seismic data,the fracture-cavity models with different scales are constructed and the forward modeling analysis is carried out to demonstrate the influence of seismic dominant frequency on the resolution.Secondly,the seismic data in this area are processed by CMP gather frequency division,and the internal structure of fracture-cavity under different frequency bandwidths is studied,and different frequency bandawidths information is used to finely characterize the fracture-cavity.Finally,the drilling data are fully used to analysize the coincidence between the actual drilling and the fracture-cavity and verify the reliability of the prediction results of the model.In this paper,the results of frequency division of seismic data are consistent with the results of geological model.Middle-high frequency bandwidth can effectively improve the imaging accuracy of small-scale fracture-cavity,and the prestack frequency division migration technology can significantly improve the prediction accuracy of small-scale fracture-cavity reservoir.
The Sangtamu regionForward modelingPrestack frequency divisionSmall-scale fracture-cavity
万方数据
维普
