Reservoir Characterization And Production Performance Evaluation For Upper Sand Of Shahejie Ⅲ Formation,block Zheng 411,wangzhuang Oilfield

With the evolution of new technology in oil development, heavy oil reservoirs are drawing more and more attention from industry. This study carrys on full-scale investigation in status, trending and challenges of heavy oil development and makes integrated analysis on sedimentation, reservoir property, conditions of Huff and Puff and available development options. Some observation and understandings can be revealed as below. There is large variation in sand thickness and “double furrows with double ridges” appears on structure map. Sand I is water-wetting fan delta sedimentary environemnt. The sand sources are different between west part and east part in Sand I. Channels are well developed and full of sand and conglomerate stone. Reservoir perperty is good for oil deposit even though shaly sand is also developed with high clay volume less sensitive to water. In general, Sand I is less heterogeneous reservoir with high porosity and high permeability. And Huff and Puff has quite different stimulation impact on each single well. The production in heavy oil block is better than that in super-heavy oil block. The analysis shows that intial liquid production rate has strong correlation with clay volume and oil saturation as well as porosity, permeability and net sand thickness. Howerver, intial oil rate and cumulative oil production are more related to oil viscosity, saturation and less related to porosity, permeability and net sand thickness. With applying HDCS technology, more oil reserves can be recovered. All the study results can guide future development of similarly heavy oil reservoirs.